2014 silverado ac problems

To date, I have done the following; - Check coolant level. - Checked mass airflow sensor (MAF) by swapping it with my work truck MAF; nothing changed. - Checked ECM relay. - Checked J-Case fuses for cooling fan 1 & 2. - Changed temperature sensor. - Changed thermostat (replaced coolant as well) - Connected a code reader, no codes identified.

2014 silverado ac problems. 34 Engine And Engine Cooling problem. Failure Date: 05/06/2016. Issue 1 - transmission: the Chevrolet silverado has a 6-speed transmission that clunks / hard shifts (very hard). Gm indicates that this is normal and/or the transmission is adapting to your driving style.

ac compressor not engaging?How to test your A/C clutch and coil, using a DVOM. and a jumper ware What you should and shouldn't see on a good AC compressor ci...

Jan 8, 2024 · Issue 4: Refrigerant Playing Peek-a-Boo. If you're turning blue but there's no cool air, it might be due to a refrigerant leak. Remember, refrigerant issues need a safe pair of professional hands ...It is recommended that you contact your preferred Certified Service Dealer or Saab Official Service Center and discuss your concerns with a member of the management team.Yes. You can drive your car with a bad AC pressure switch with no problem, but the AC system won't work. When the AC pressure switch is bad, it will switch off the power sent to the AC compressor, which will then not engage and cool the air conditioning system. The AC pressure switch is an important part of your air conditioning unit.3 days ago · 2014 Chevrolet Silverado 1500 4x4. -. $16,999. (Tupelo ms) 2014 Chevrolet Silverado 1500 z71 4wd run great no issues, southern bought and owned. 150k miles, no rust no check engine lights, been leveled, never towed anything, good truck. Gets 20mpg that’s city and highway can’t beat that.I have a 2014 Silverado 1500 WT crew cab with a 4.3L V6 with 120k miles and I'm having AC blower motor issues . a couple of weeks ago the blower motor was intermittently working then a couple of days ago it finally just completely stopped working.I went to replace the resistor in to blower motor housing and I came learn there is not a resistor in the system.

About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday TicketThe 120-volt outlet on the Chevy Silverado is a new update that was added to a few models. The outlet allows you to connect devices for charging or for regular operation. It is an update that was added to the 2019 – 2021 Chevy Silverado and Sierra models. The 120 volt outlet can take on a maximum of 400 watts.3 days ago · 2014 Chevrolet Silverado 1500 Crew Cab Edit. 2014 Chevrolet Silverado 1500 Crew Cab. Kelley Blue Book®. Trade-In Value: $7,765. Valid for ZIP Code 23917 as of 05/22/2024. Mileage: 116,607. Forecasts.Less common causes are dirty or sluggish blower motor and faulty mode door actuator. 1. Clogged cabin air filter. Dirty AC filter is the leading cause of weak AC airflow in Chevy Silverado 1500. The pollen filter, also known as the cabin air filter or microfilter, is responsible for filtering the air that the passengers breathe in the cabin.The species composition and dynamics of cyanobacteria and algae inhabiting the ice of Lake Kalach (Omsk oblast) have been studied. High abundance and a low floristic similarity with phytoplankton have been discovered. Small-celled cyanobacteria and chlorococcales dominate in number of species and abundance. A new term, "cryophyton," is proposed for photosynthetic organisms living in the ice.You should have the trans filter replaced, and the trans flushed and filled with new fluid, and see if it works ok. If the radiator was removed to do the condenser, the trans cooler lines would have to be disconnected and reconnected. They are held in place by a clip with a plastic cover slid over it after the clip is in place to keep it from ...

ac compressor not engaging?How to test your A/C clutch and coil, using a DVOM. and a jumper ware What you should and shouldn't see on a good AC compressor ci...Gently remove the control panel and inspect the button contacts for any signs of damage or dirt. Clean the contacts if necessary and ensure a secure connection before reassembling the panel. 2. Erratic Temperature Control. Erratic temperature control is another common problem that Silverado owners may encounter with their AC control panel.Reasons a Chevrolet Silverado 1500 Is Overheating. Chevrolet Silverado 1500. The most common reasons a Chevrolet Silverado 1500 is overheating are a coolant leak (water pump, radiator, hose etc.), the radiator fan, or a failed thermostat. 0 %. 41 % of the time it's the. Coolant leak (water pump, radiator, hose etc.) 0 %. 32 % of the time it's the.9 Oct 2021 ... In episode 102 of Bad Hombre Garage, I do some quick troubleshooting and show you how I fixed the malfunctioning heater/air conditioner ...General Motors LLC (GM) is recalling certain 2015-2020 Chevrolet Suburban, Tahoe, and Yukon, and 2014-2018 Chevrolet Silverado 1500 and GMC Sierra 1500 vehicles equipped with a 5.3-liter engine, a ...4 May 2020 ... Comments45 · 2014 Silverado fans running high , no ac , no temperature, gauge not working · 2014 Silverado AC Problems (How to Fix) · 2005 to 20...

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Here are the common transmission problems in the 2014 Silverado pickup model. Problems. Possible Solutions. Gear is slipping. Change the old and contaminated transmission fluid. Loud clanking noise. Check the wheel bearing. Jerking and abnormal shaking. Replace the worn-out shocks and ensure the correct lube level.I am now at 2000 miles the first problem happened at 1500. - Dustin S. , Glendale, AZ, US. Maximize. The 2015 Chevrolet Colorado has 5 problems reported for a/c not working properly. Average ...Change Year. Alex Showalter. Jan 22, 2022. The 2014 Chevrolet Silverado 1500 is a half-ton truck with a price range of $25,298 to $39,905. The truck is more expensive than competitors, but good reliability and new technology help the Silverado earn our recommendation. 4.42. Owner Reviews.14 posts · Joined 2010. #1 · May 14, 2010. The A/C on my 2005 silverado has the nasty habit blowing enjoyable cool air most of the time when it all of a sudden blow scaling hot air from the driver's side vents. The passenger side remains cool. It may go for days and not have this problem or it may repeatedly do this in one small trip around town.22 hours ago · The first step in resetting the AC on your Chevy Silverado is to turn off the vehicle and safely open the hood. This step is essential to ensure your safety while working on the AC system. Be sure the engine is cool before proceeding. Step 2: Locate the AC …

Answered in 28 minutes by: Chevy Mechanic: Dave Nova. Typically this problem is caused by a faulty low pressure switch. The low pressure switch is loccated on the a/c accumulator in the engine compartment. The low pressure switch simply unscrews and the new one screws in place.So i havent had ac on my truck for a couple of wheeks and after testing the system i thought i had the solution but i was wrong. Ateast you guys can see wher...The most common reason why your AC clutch is not engaging is that the AC refrigerant level is too low or too high. It can also be caused by a faulty high or low AC pressure switch, a blown fuse, a bad AC clutch or a bad electrical connection. Here is a more detailed list of the most common reasons why your AC clutch is not engaging: 1.2017 Silverado LTZ with 5.3L AC Problem. AC PRO worked on my vehicle. Lasted 2 weeks on just recharging the system WITHOUT MAKING THE NECESSARY REPAIR/REPLAC...Step 3: Find and remove the HVAC fuse. The HVAC fuse can vary in location depending on your GMC's year and model so be sure to consult your owner's manual. Step 4: Pull the fuse out, wait 10 seconds, then reconnect it. You'll want to be gentle on the fuse so you don't damage it.Jun 12, 2017 · Owners of 2014 Chevrolet Silverados are furious they can't get their AC fixed | Torque News. Dozens of 2014 Chevrolet Silverado owners have contacted us over their frustration about their...2014 Silverado 1500 w/5.3L Ecotec engine. Replaced the following: Compressor. Condensor. Expansion Valve. Low side line w/two mufflers. High Pressure Switch. AC is cooling great, but having two issues: 1. whirring sound when ac is on-.2004 Chevrolet Silverado 1500. Asked by kimkingtaylor in Houston, TX on June 20, 2011. My ac will blow hot air from time to time on the driver's side only. If I turn the pickup off and re-start it seems to reset something and the ac will again begin working properly-sometimes for the rest of the day sometimes it will begin blowing hot again in ...Step 4: Reset It And Turn On The AC. Turn the breaker off, and wait for at least 30 seconds. Make sure it is perfectly off, then turn it on. Turn the AC on and wait a couple of minutes. It will reset the thermostat and you will feel the cool air blowing.1. Start engine, turn on AC, and see if the compressor drive plate (the center of the compressor) is turning at same speed as the belt and compressor pulley.2. Engine off, put a wrench on the center of the AC compressor drive plate, and see if you can rotate the compressor clockwise.CHEVROLET > 2014 > SILVERADO 1500 > 5.3L V8 > Heat & Air Conditioning > A/C Compressor Price Alternate No parts for vehicles in selected markets. GPD 6513078 Prefilled w/ OE-Specified Oil Info 4 Groove; 7SAS17A ...

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The 2014 Chevrolet Silverado 1500 has 10 problems reported for transmission clunk. Average repair cost is $4,770 at 76,400 miles. CarComplaints.com : Car complaints, car problems and defect ...Nov 6, 2023 · Other Reasons & Solutions For The Air Conditioning Problems. 1. Leak of Coolant. Problem: Air conditioning problems in your Chevy Silverado may be due to a coolant leak, indicating a hole in the AC system or a disconnected hose. Solution: To address this issue, it’s essential to locate and repair the coolant leak promptly.2. Inconsistent cooling. Another symptom of a bad or failing ambient temperature sensor is inconsistent cooling. As the ambient temperature sensor plays a direct role in the automated function of the AC system, when it is having a problem this may interfere with the system's ability to cool the vehicle. If the ambient temperature sensor fails ...5 days ago · 2014 Dodge Journey A/C problems. Blend door issue. Mostly those are either vacuum or electric motor driven unless the door itself has failed (cracked.broken, etc). On a lot of cars that is a flaming pain because the dash may have to come out for access. Best to have an AC specialty shop have a look.2017 Chevy Silverado High Country with a 6.2 liter engine. I am replacing the ac compressor and the condenser on this truck. I am also replacing the expans...The issue involves 2014-2017 trucks. Looks like PN: 23141861 is the OE part and 84211191 replaces that. I found Dealer parts dept. notes in the Retail Inventory Management (RIM) program saying last PN no longer fits 2014-2016 and to use 84243590. It looks like the revised part has some reinforcement where the original ones were cracking.Location of a plugged AC drain on a 2017 Chevy Silverado. Should be the same on most 14-18 Chevy GMC trucks. Much easier to reach than previous year trucks!January 15, 2023 by Editorial Team. Here are the steps to reset the AC on a Chevy Silverado: Turn off the engine: Make sure the engine is off before you begin. Locate the AC compressor clutch relay: The AC compressor clutch relay is typically located in the power distribution box under the hood. Remove the relay: Carefully remove the relay from ...2007-2010 Chevrolet Avalanche, Silverado, Suburban, Tahoe. 2009-2010 Chevrolet Traverse. 2007-2010 GMC Acadia, Sierra, Yukon, Yukon XL. 2007-2010 Saturn OUTLOOK. The A/C light is designed to flash and disallow A/C operation if any of the following conditions are present: Ambient air temperature (AAT) is too cold (35 degrees or colder)

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#1 · Jun 14, 2015. Worked great yesterday. Wife goes to work and calls me says the ac is blowing warm air. Like the vent option is on. I tried resetting battery and no luck. Both set at 65 degrees and feels like very warm air from outside. Anyone had this on there 2014?? 14 Silverado LT Double Cab Texas Edition . Save Share. Like.The 2017 Chevrolet Silverado 1500 has 5 problems reported for a/c not working properly. Average repair cost is $1,500 at 32,000 miles.Run your Silverado engine for 20 minutes so that you can raise the engine temperature. Alternatively, you can run the engine until the gauge shows that the temperature is high. Lift the hood and observe the coolant tank. Usually, this tank has two lines with the upper line reading “hot/full.”.The species composition and dynamics of cyanobacteria and algae inhabiting the ice of Lake Kalach (Omsk oblast) have been studied. High abundance and a low floristic similarity with phytoplankton have been discovered. Small-celled cyanobacteria and chlorococcales dominate in number of species and abundance. A new term, "cryophyton," is proposed for photosynthetic organisms living in the ice.So I finally fix the ac in my truck, in this video I will show you how to changed the discharge hose. My discharge hose had a small hole which was leaking al...Average Cost to Fix: $1,400. Average Mileage: 49,000 mi. The 2014 Chevrolet Silverado 1500 has 2476 problems & defects reported by Silverado 1500 owners. The worst complaints are AC / heater ...Today on 2CarPros we show you how to replace the blend door actuator motor on a Chevy Silverado, Tahoe, Suburban and this video guide will also work on a GMC...2013-10-17. Recall no. 13V488000. General Motors (GM) is recalling certain model year 2014 Chevrolet Silverado and GMC Sierra 1500 vehicles manufactured August 1, 2013, through September 10, 2013 ...August 2009. 2004 Chevy Silverado 5.3L Z-71, 46,000 mi. automatic transmission. Approx. 2 months ago, the A/C became intermittent (very cold air when working), then progressively, the times it worked tapered off and now the A/C does not work, other than to blow hot air. The dual-zone electronic control seems to be working properly.In all seriousness, this is another one of those problems that appear over time, just sooner in the case of 2014 Chevy Silverado transmissions. And specifically, a bearing that has seen better days is typically the culprit behind transmission noise. When a transmission bearing fails, it needs to be changed as soon as possible.1. Fuel Pump Failures. The Duramax diesel engines in the second and third generation Silverado 2500HD have had many reports of fuel pump failures which can lead to expensive repair bills. This problem only affects the 2011 to 2016 model years of the Silverado 2500 and 3500, as well as the GMC Sierra.One problem related to air conditioner has been reported for the 2013 Chevrolet Silverado 1500. The most recently reported issues are listed below. ... My 2013 chevy silverado has an air conditioning problem. So did my old truck, a 2010, which I teased in for the 2013. I have ran across many, many complaints if this on the chevy's on google and ... ….

The A/C compressor pressurizes the refrigerant in your A/C system, turning incoming refrigerant into a hot, high-pressure gas. It also pushes the refrigerant throughout the system, allowing it to change states and cycle back to the compressor. When you activate the A/C system from the cabin, the A/C clutch locks and engages the compressor.In episode 102 of Bad Hombre Garage, I do some quick troubleshooting and show you how I fixed the malfunctioning heater/air conditioner blower fan on my 2003...Just installed a new compressor, dryer, et al. Hooked up my gauge set, drew a vacuum for 30-minutes, observed for another 30 that there were no vacuum leaks, and then charged the system. Charged to system, disconnected my gauge set, and had a leak at the high-side port. I capped it quickly enough but I'm sure it will leak down pretty quick.2014 Silverado 5.3L LTZ Z71 4x4 Crew Cab with a Custom Tune from DiabLew (since Jan 2022). Airaid Modular Intake Tube. Those are my only aftermarket parts/changes. I do NOT have the common issue of my radiator fans not shutting off when the truck shuts off. Those are the only damn articles I can find, and that is not my issue.GM had a known issue with the 2014 A/C condensers developing a crack and losing fluid. Not sure if it continued into the 2015 models. You could just be low on coolant and the system detected that and won't engage the compressor. 2.) It is not the transmission cooling system at fault.But the Services Technicians' line manager took a quick look at the condenser through the grill. He quoted me about $1,250 to bring it back and replace the condensor, and was a bit surprised no 17336 was issued on my VIN. The 17336, if it were to cover my VIN, extends the warranty on the condenser to five years or 60,000 miles, both …The contact owns a 2014 Chevrolet Silverado 1500. The contact stated that while driving at slow speeds and making a left turn, the steering wheel and brakes became inoperable. The vehicle lost motive power and stalled. The contact was able to restart the vehicle. There were no warning lights illuminated.Check the condenser to see if it’s blocked by debris. If your condenser has taken damage or is clogged up, it can’t remove the heat from the refrigerant. Check to ensure that the electric fan over the condenser is engaging. If the cooling system works better on the highway (where fans aren’t needed), your Silverado may be having fan ...2014 Silverado LTZ Engine Problems. So a little back info. I signed the papers on a 2014 Silverado 1500 LTZ with all the bells and whistles 15 days ago (July 21st). I traded in my 2009 370Z in on it, so I told them a I needed a few days to get all the parts off of the car before trading it in (intake,exhaust,coilovers,rims,system,sway bars, …What's up guys bring you as a video showing you guys how to fix the AC vents on any Silverado all the way from 1999 to 2007 pretty much the little vent actua... 2014 silverado ac problems, The 2014 Chevrolet Silverado 1500 has 3 different fuse boxes: Engine Compartment Fuse Block diagram. Instrument Panel Fuse Block (Left) diagram. Instrument Panel Fuse Block (Right) diagram. Engine Compartment Fuse Block., Here is a list of the most common causes of random stalling: Faulty alternator. Fuel pump damaged. Fuel filter needs replacing. Damaged/worn out spark plugs. Dirty/faulty throttle body. Camshaft and/or crankshaft position sensors faulty. Mass air flow sensor faulty. Throttle position sensor failure., 1) Move the mounting plate from the old actuator to the new one. 2) Turn off the ignition switch and the HVAC control switch (if applicable). 3) Plug in the actuator. 4) Rotate the door linkage until it is in approximately the center of its travel. 5) Slide the actuator onto the linkage shaft., Buy In-Store Buy Online. Detailed specs and features for the Used 2014 Chevrolet Silverado 1500 including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine type ..., I have a 2014 Silverado 1500 WT crew cab with a 4.3L V6 with 120k miles and I'm having AC blower motor issues . a couple of weeks ago the blower motor was intermittently working then a couple of days ago it finally just completely stopped working.I went to replace the resistor in to blower motor housing and I came learn there is not a resistor in the system., Replacing the A/C evaporator core on a 2014-2018 GMC Sierra 1500 (the easier method-no intake or steering column removal)tags:removing dash 2014-2018 Sierra ..., 22 hours ago · The first step in resetting the AC on your Chevy Silverado is to turn off the vehicle and safely open the hood. This step is essential to ensure your safety while working on the AC system. Be sure the engine is cool before proceeding. Step 2: Locate the AC …, Luckily my mechanic told me about the recall on Chevy Silverado 1500 trucks from the years 2014 through 2018 due to a bogus AC hose that used. There are thousands of people just like me who came across the same exact problem with their truck. Unfortunately I found out after I was about $700 into the negative as far as having to get it worked on., Automatic transmission. 28,800 miles. A D V E R T I S E M E N T S. April 04,2023 took my 2018 1500 4x4 5.3L Crewcab Silverado back to dealer where I bought new in 2018 to have failed A/C condenser ..., KD_23 said: Just picked up a 2002 2500HD with a 6.0 V8. The problem I am having is at the same time I lose power to the cluster and ac control panel. When I went to look at the truck the AC blew cold and all the gauges seemed to be fine. I did a deep dive on the ac system and found that when this problem happens I get 12V to the blower resistor ..., 2015 Chevy Silverado 1500 Common ac issue and how to fix it. step by step video on how to replace an ac condenser and where the common issue is and leak., 6. Bad blower motor. If there is no air flow or reduced air flow from the vents on your Chevy Silverado HD, bad blower motor could be the culprit. A worn out or weakened blower motor can also produce abnormal sounds when in operation. You cannot repair a broken blower motor, the part must be replaced with a new one., Step 3 – Check the blower motor. It could be dead. If you have inspected the resistor and it is in good shape, then root of the problem could be a dead blower motor. You have to work in the engine bay and disconnect the current motor to check its' voltage and make sure it is receiving power. If the power source isn't the issue, then the motor ..., Broken radiator fan. When the cooling fan fails to turn on both when the AC is on and off, the fan itself can be the culprit. The cooling fans have an electric motor inside that powers them to spin. If the motor fails, it won't power the fan blades to spin. If only one radiator fan is working, check the other one., Buy In-Store Buy Online. Detailed specs and features for the Used 2014 Chevrolet Silverado 1500 including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine type ..., Two of the more common problems with the Chevy Silverado 1500 over several model years, including the 2013, are reduced power and the "check engine" light coming on in the display. The throttle position sensor (TPS) is responsible for this. It can fail in the vehicle. This can cause a drop in the vehicle's power, the display of the check ..., Contains gaskets, o-rings, or seals to properly replace the product Injection molded. $6.30. ACDelco® Genuine GM Parts™ A/C Orifice Tube. 0. # mpn5052327454. Chevy Silverado 2500 HD / 3500 HD 2014, Genuine GM Parts™ A/C Orifice Tube by ACDelco®. With 0.67" Tube Diameter., 1. Blown Fuse. There are numerous fuses inside your vehicle and you should consider looking at all of these fuses to ensure that they are working. A blown fuse is the main cause for these outlets not working. However, it could be daunting to determine which fuses are the ones that need to be replaced. By checking the fuse box and looking ..., 2014 Chevy Silverado Truck AC Recalls and Complaints. While there are 19 recalls for this truck, none of them were for the air conditioning system. ... Only problem I have had is the air conditioning replaced cooling coil now 164000 air has guit again Lauren H Lauren H. has sold new and used cars, negotiated numerous car deals, has a thorough ..., 1. No cold air from the AC system. One of the first symptoms of a potential problem with the evaporator temperature switch is no cold air from the AC system. If the evaporator temperature switch fails or has any issues that causes it to send an incorrect signal to the AC system, it can affect the system's ability to produce cold air. 2., If you find there's an open recall for the air conditioning system of your GMC vehicle and you're not sure what to do next, reach out to GMC customer service at 1 (866) 522-9559. They'll be able to help you find a dealer who can complete the repair, as well as advise you as to how long the repair is likely to take. Photos: GMC., 6. Bad blower motor. If there is no air flow or reduced air flow from the vents on your Chevy Silverado HD, bad blower motor could be the culprit. A worn out or weakened blower motor can also produce abnormal sounds when in operation. You cannot repair a broken blower motor, the part must be replaced with a new one., Most blend door actuators have a built-in feedback sensor that keeps the climate control apprised of the door's position. The most common symptoms of a bad blend door actuator include abnormal noises, incorrect climate control outlet temperature, and varying outlet temperatures. Electrical faults and damaged gears are some of the reasons why ..., Worst 2013 Chevrolet Silverado 1500 Problems #1: Excessive Oil Consumption 2013 Silverado 1500 Average Cost to Fix: $4,500 Average Mileage: 71,000 mi. Learn More #2: Transmission Failure 2013 ..., Only had new ac, a 3 clutches!!!! When I sold it, it was still running GREAT! ... a 2009 6.0L Silverado, and 2014 5.3L Silverado. The 2014 gave me problems from the go, but the other two were ..., 1. Oil Consumption Issues. Excessive oil consumption is one of the biggest issues of the second generation Chevy Silverado 1500. This problem only affects trucks equipped with the 5.3-liter V8 and is more common on the 2007 to 2011 models. The 5.3 V8 engine was the first to feature GM's AFM (Active Fuel Management), which automatically ..., Oct 28, 2021 · In an order issued Oct. 26 in a Michigan federal court, US District Judge Matthew F. Leitman denied GM’s motion to dismiss claims against it in the air conditioning class action lawsuit. The lawsuit goes back to 2018, when a group of GM owners filed class action proceedings alleging some of its vehicles have issues with the air conditioning ..., Dual climate control issue. We had to start with this issue because it is the …, With everything connected up and the engine running/AC on, the clutch on the compressor engages, then disengages, then engages again and so on. When engaged, the low side goes up to between 60-70 psi, then back down to about 10 psi. Simultaneously, the high side goes between about 90 psi when the clutch is disengaged to about 110 psi when engaged., 6827 posts · Joined 2010. #15 · May 26, 2011. Ok, so I went and bought a can of refrigerant today. When I checked the pressure of the A\C (the engine was running during the whole time, along with the A\C turned on in the cab, and set to MAX), it read around 70 PSI- way past the "Safe" range on the gauge., Step 2 - Check the air conditioning system. There may be no refrigerant in the system. When there is a lack of cold air coming from the vents, most will agree that there is a leak in the system. Refrigerant, commonly referred to as freon, is a chemical that, when fluctuating through high and low pressures, becomes cold., 2014-2016 Chevrolet Silverado 1500; 2015-2017 Chevrolet Suburban; ... (TSBs) to dealers concerning air conditioning problems. On October 6, 2014, GM issued TSB PIT5331 covering 2015 Escalades ..., A technician will diagnose your Chevrolet Silverado 1500 heater using the symptoms you report as a starting point. Because your Chevrolet Silverado 1500 heater is a complex mechanism that uses an electric fan to blow air through a heater core that is heated by the engine coolant, the problem could be electrical, mechanical, coolant-related, or a combination of these systems.