Why is my GMC Sierra not blowing cold air?

One of the most inconvenient vehicular problems is when the A/C won’t blow cold air. If your GMC Sierra isn’t keeping you cool, we’ve outlined some of the most common reasons why this might be happening. The only thing that the air conditioning system has in common with the heater is that they both use the climate controls and the blower motor.

Why does my GMC air conditioner stop working?

For about 5 miles the A/C worked normally till we hit a R/R and the bump made it stop blowing cold air and he was finally convinced. Back to the shop and 30 min later they found the problem. Turned out to be the low pressure switch, (under hood on bottom of small tank) it was corroded and causing a loss of electrical contact.

Why is the air conditioner in my car not cooling?

The most common causes of broken air conditioning are leaks or compressor issues. If your air is blowing cool but not cold, the problem could be a clogged filter, cooling fan problem, radiator trouble, or it could simply be that you need to recharge your AC.

Why is my car blowing hot air and cold air?

Blend air door is the reason for drawing hot air to cold air in your car system. This door is located in the ventilation system. The hot air is blown directly from the engine if the blend door isn’t working properly.

Why is my AC not blowing cold air?

The chemical Freon or simply you can call it coolant is the reason why the AC cools hot air quickly. The chemical can run out if there is any leakage in the AC. Thus, AC would not work, as there is no Freon in the system.

Why does my AC keep blowing hot air?

Recently when running the AC, it will randomly begin blowing hot air instead of cold. No matter what I try, the only proven way to get cold air to blow again is to shut the engine off, wait around 5 seconds, then crank back up. After doing this everything seems to work fine for a week or so…then the AC starts blowing hot air again.

Where are the vents on my GMC Sierra?

No output on dash face vents or defrost vents but floor works ok. I have tried the pulling the fuses both under hood and left of dash but that did not fix my problem.

Why is there no air coming out of the vents?

This should cause the control head to go through a sync mode with all the output devices (mode, recirc, etc.). It’s a long shot, but sometimes those control heads go out of sync for no obvious reason.

When did my GMC Sierra air conditioner stop working?

I had a 2001 GMC Sierra that did this when truck was less the one year old (summer of 2001 is when it was). The dealer had the truck in the shop idling for a long time and the A/C worked perfectly. I told them to take it for a ride and see. So the service manager in an effort to convince me nothing was wrong went for a ride with me driving.

Why does my air conditioner stop working in the morning?

We added a can of freon, tightened the Schrader valve, etc. When it is cold in the morning it works fine. When it heats up during the day it will run for a while and then the compressor kicks off. If I turn off the A/C in the truck for about 3-5 minutes it will work again for a while when I turn it back on.

Why does my car AC blow cold air then blow warm air?

But that cold air turns warm fairly soon after because the high side pressures build to the point that the high pressure switch shuts off the compressor clutch. Once pressures equalize, the high pressure switch allows the compressor to start up again. The cycle repeats over and over, providing a short period of cold air, followed by warm air.

Why is the air conditioning in my car not working?

Having your car’s air conditioning go out suddenly can ruin your day fast. The most common causes of broken air conditioning are leaks or compressor issues. If your air is blowing cool but not cold, the problem could be a clogged filter, cooling fan problem, radiator trouble, or it could simply be that you need to recharge your AC.

How does the car air conditioner cool the car?

The AC evaporator acts like a huge ice cube with holes in it. It allows the hot, cabin air to flow through the core, rapidly cools this air, and blows it out into the cabin again. The cool air felt from the dash vents is provided by the AC heater blower motor assembly.

What should the ambient temperature be in a GMC Sierra?

Install the J 43600 ACR 2000 Air Conditioning Service Center. The ambient temperature must be at least 16°C (60°F). Do not induce additional air flow across the front of the vehicle during the test. Record the ambient temperature displayed on the J 43600.

Is the a / C not getting cold in a GMC Truck?

Also truck is a 2003 silverado 5.3L im actualy having the exact same problem, mine has plenty freon but still when it blows its not cold. its not hot but not cold maby blowing 75 degrees? idk but i know it sucks. Yes it does!

Why is my 2000 Silverado RCLB getting cold?

My 2000 Silverado RCLB was getting cold initially then dwindling down to just ambient air temps. Checked the running pressure and it was to the low side of normal. Sometimes it would do this and other times it would not, Shut the AC off for a few minutes and then turn it back on and BAM cold air again…

Is the a / C on my GMC Silverado 5.3L?

Also truck is a 2003 silverado 5.3L Click to expand… There is a safety precaution to keep from burning up the pump/compressor when the freon is low, the relay won’t lock over but after you read it you have to jump the relay with a piece of wire to kickstart it and from there on it’s fine as long as it keeps pressure and there is no leak.

Why does my GMC Sierra AC not work?

While there are a variety of reasons your GMC Sierra 2500 HD air conditioning won’t work, the most common 3 are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning compressor. What will be the outcome of an air conditioning system diagnosis?

Can you add refrigerant to a GMC Sierra 2500?

Most refrigerants include a leak sealer that will seal small leaks in addition to filling the R134a refrigerant. The A/C system in your Sierra 2500 HD consists of a compressor that is belt-driven, an evaporator and freon. If there is a problem with your compressor or evaporator, adding freon will not restore cooling.

Why is my GMC Sierra 2500 HD blowing hot air?

When the air conditioner in your 2004 GMC Sierra 2500 HD starts blowing hot air, you likely have a freon leak. Recharging the freon in your AC system is an inexpensive and easy first step to restoring the cooling capacity of your A/C system.

How can I get my car AC to blow cold air?

Just buy a can of freon and a gauge to connect everything. Squeeze the trigger until the can is empty and your AC should be blowing cold air. I did find out that my system was so low that the small can wasn’t enough and i should have bought a second can to get the car to blow really cold air.

What to do if your car AC is not working?

You can handle this situation by using the best maintenance tips. Use a charging machine that will pour coolant and make your AC work properly. If the AC still doesn’t work even after using the charging machine, contact the nearest mechanic.

Is your car air conditioner not blowing cold air when?

Ever had problems with your car about air conditioner, or AC, not blowing cold air when the car is at stop? This happens in most cars when the AC system of your car does not have properly maintenance and it definitely makes you irritated to stay in the car on a hot day with no cool AC.

Why does my AC not cool hot air?

Why is my air conditioner not blowing cold air?

A defective relay, compressor clutch coil or damaged compressor are all possibilities. The air conditioning system is equipped with safety switches that automatically turn the compressor off when the A/C refrigerant level becomes low.

Why does my 2005 Tahoe blow hot air?

My 2005 Tahoe hava AC giving hot air problem. AC would suddenly blow hot air just on the driver’s side while the passenger side still blew cold. The only way to correct it was to turn the car off and back on and then it would immediately start blowing cold again. This happens intermitently.

Why is the rear AC warmer than the front?

When the rear ac is turned on only, the air isn’t that cold. But when the front ac is turned on, the rear ac is blowing colder air out the vents. That’s because the rear AC by itself can’t turn the compressor on… The front AC has to be on for the compressor to turn on….

Is the a / C on in my GM Truck?

After two cans of R134a and 3 days later a can of Stop Leak, everything is cool and holding its pressure. We are getting some very humid 95 degree days so the A/C is being used frequently. Its 10:12am and its already 91 degrees outside…

Is the front of my GM Truck warm?

The gauge never went past 45psi when recharging and the front vents where still warm afterwards. This morning I decided to turn on the ac in the front while driving to work and the air was cold but it could be colder. I went and bought another can and will recharge again at lunch time and post my results.

Why is the temp sensor on my truck not working?

On my truck, a lot of the time, especially this time of year, the temp reading will get stuck at a cold morning temp (say like 32F) and then if it gets 60 in the afternoon, if I am just driving short trips around town, it will not let the Auto HVAC work correctly until I do one of those ‘instant resets’.

How to start a diesel in cold weather?

Some helpful cold weather tips to help you start a diesel in cold weather. This can be a chore in cold weather and harsh winters. However, there are several tips that you can take to make getting your diesel started in the cold morning much easier. ► Check Out Our Other Wade’s World Videos Here: https://www.youtube.com/playlist?list…

What kind of climate controls does a GMC have?

You are currently viewing GMC.com (United States). Close this window to stay here or choose another country to see vehicles and services specific to your location. Your GMC is equipped with climate controls that allow you and your passengers to stay comfortable – whether you’re braving the heat of summer or the chill of winter.

Why is my Chevy Silverado Sierra running cold?

From my experiance fast temp changes are most likely a air pocket or flow issues. The 198 to 170 in a km is along the lines of too fast to be normal. Have tried 4 thermostats from different suppliers so not likely the issue. No noises. Used old water pump as was working fine and also less than 1 year old. Radiator is same part number as old one.

Why is my GMC Sierra air conditioner not working?

Lack of Refrigerant – Your Sierra’s air conditioner will not work if the refrigerant has disappeared due to a leak. In fact, most won’t even cycle on without the right amount of refrigerant pressure. This is far and away the most common reason that your Sierra’s air conditioner is not functioning.

What do you put on a GM coolant sensor?

Installation is the reverse of removal. If reusing the old sensor, coat the threads with GM sealant 12346004 or equivalent. New sensors are already coated; additional sealant is not needed. Tighten the sensor to 15 ft. lbs. (20 Nm).

Where can I find the part number for my Silverado AC?

Thanks to their wonderful website, there is no direct link or part number. When added to cart it shows as “Air conditioner and heater, Evaporator and heater components, Actuator, Mode temp and def, Mode temp and def – 2003-07 – 2003-07” Somewhere along that path, you will see a View Illustration button.

How much is the AC unit on a Silverado?

The hardest part was the last screw holding up the plastic cover above the center hump. Gonna kick that engineer. The part is $137 on gmpartsdirect. Thanks to their wonderful website, there is no direct link or part number.

What’s the problem with my GMC Sierra AC?

I’ve got a problem I got hot air coming out the vents on the driver side,and cold air on the pass.side that includes when im running the air. Blows cold air on driver’s side and hot air on passenger side. Should heat both sides. when heater is on it will throw heat for a while and then starts to throw cold air out the driver side vents.

Why does my Chevy Silverado blow hot air?

My 2005 Chevy Silverado 1500 is in good shape, minus the driver’s side vents. Hot air continuously blows out of the vents, even with the AC off. I bought an BLEND DOOR ACTUATOR to replace the one that controls this function, however even the new actuator will not function when the wires are connected.

Why does drivers side blow hot air when a / C is turned on?

Re: Drivers Side blows hot air when a/c is turned on.. Climate control system was not responding correctly. Blowing hot on driver and cold on passenger, from dash and floor only. Dual temperature would not respond to adjustment, and vent knob would not change direction of air flow from dash to floor or defrost.

Why is my GMC Silverado not getting cold?

The guy at the shop obviously didn’t take it for a ride, or even put a thermometer in the vent. My 2000 Silverado RCLB was getting cold initially then dwindling down to just ambient air temps. Checked the running pressure and it was to the low side of normal.

Why does my GMC Sierra 1500 not work?

While there are a variety of reasons your GMC Sierra 1500 air conditioning won’t work, the most common 3 are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning compressor. What will be the outcome of an air conditioning system diagnosis?

Is the a / C on my GMC Sierra working?

Have never had a problem with the a/c, has always blown ice cold until about a month ago while driving starting blowing extremely hot air. Went home checked fuses to see if any were blown. In which none of them were. The next morning got in and it was working fine.

Why does my GMC Sierra 1500 turn into a heater?

Spoke with a friend that has the same truck he said his and his dads truck did the same thing. This definitely needs to be looked into because it seems to be a very common problem. When I turn on the AC, it works but sometimes the pilot’s side turns into a heater without any reason; the co-pilot’s side is fine.

What’s the problem with my 2004 GMC Sierra 1500?

No one has added a helpful site for this 2004 Sierra 1500 problem yet. Be the first! Read reviews of repair shops in your area. Enter your zip code: For some unkown reason my heater in my truck will only work on high (NUMBER 5) position and no other position.

Why is my Chevy Tahoe Air Conditioner not cold?

Most of the time, when your Tahoe’s air isn’t blowing cold enough, it is going to be a lack of refrigerant causing the problem. We recommend having a professional recharge your A/C if it does end up being a coolant issue.

How does the heater work on a GMC Suburban?

The GMC Suburban uses a heater core to heat the cabin. The heater core redirects hot engine coolant away from the engine and through the heater core to heat the Suburban. Over time, the heater core may fail. When this happens, you won’t get any heat in the passenger cabin and you’ll need to replace the core.

Why do the vents in my Chevy Silverado blow only?

Recharge the A/C. There may be air trapped in the system. Hot coolant is responsible for passing through the heater core, creating hot air which can than pass through the vents and into the cabin. On some occasions air can become trapped in the system, stopping the coolant from doing its job.

Where does the air come from in a GMC Sierra?

This 2005 GMC Sierra came in with the complaint that the air will only flow from the defroster vents, regardless of where it is commanded to. This Sierra has auto a/c controls and no floor mounted center console.

Is the Silverado 1500 AC blowing cool air?

I have a 2001 Silverado 1500 with the 4.8L engine. The AC works fine but the heater only blows cool air. We just replaced the thermostat and it still doesn’t work right.

When do you need to replace the heater core in a suburban?

The heater core redirects hot engine coolant away from the engine and through the heater core to heat the Suburban. Over time, the heater core may fail. When this happens, you won’t get any heat in the passenger cabin and you’ll need to replace the core.

Why is my car heater blowing cool air?

I felt the heater hoses, had one hot and one Luke warm so with the engine running and the heater controls in the hot setting, I just started rapidly squeezing the hot hose for about fifteen seconds. The cold hose got very hot and I jumped in and switched on the heater.

What are the most common problems with a GMC Sierra?

Another 258 people reported the second-biggest issue where heating and air conditioning temperature and air delivery mode door actuators may fail. If one or more delivery mode door actuators fail, the HVAC system may not produce correct temperatures or air delivery. The HVAC system stores fault codes, which help with diagnosis.

What to do if your GMC Sierra heater stops working?

If the heater has stopped working in your Sierra, this process has failed in one way or another. A word of caution: If there is no coolant in your overflow, you can refill it by adding more to the overflow reservoir. There is almost never a situation where you would need to take the radiator cap off of the radiator to add coolant.

Is the GMC Sierra SLT a heavy duty vehicle?

Available on 2021 base Sierra HD. Standard on SLE, SLT, AT4 and Denali 2021 trims. Read the vehicle’s Owner’s Manual for important feature limitations and information. Excludes other GM vehicles. Requires available accessory trailer camera and installation. Not compatible with all trailers.

When did the GMC Sierra have the most problems?

The model years with the most problems reported were 2004 and 2007, with more than 60 complaints each year, followed by 2002, 2003, 2005, and 2010, with more than 40 each year. Of the 112 problems, five different complaints have been reported 90 or more times.

What kind of trailer does a GMC Sierra 3500 need?

Requires Sierra 3500 HD Regular Cab Long Bed 2WD DRW with available Duramax 6.6L Turbo-Diesel V8, Max Trailering Package and gooseneck hitch. Before you buy a vehicle or use it for trailering, carefully review the Trailering section of the Owner’s Manual.

Can a GMC Terrain air conditioner not blow cold?

It is entirely possible for your Terrain’s heater to work just fine even when the air conditioner is not blowing cold at all. That’s why troubleshooting the air conditioner is totally different than troubleshooting the heater. GMC Terrain Air Conditioning Not Blowing Cold Causes

Why does my car a / C stop blowing cold air?

When she got home, I put in a new thermostat. Drove it around for about 10 mins and the car stayed at 210 on the gauge (as it should) and the a/c worked fine. This lasted for 2 days and then it went back to dropping the water temp, killing the a/c. My thoughts are of course electrical.

When does the a / C fan stop blowing cold air?

Temp gauge drops to straight down, Fan blowing full and loud, A/C still Blows but Not cold and the recirculation button flashes. Kind of odd that it is the 2014’s that have started doing this. Another way for GMC to make up spend money.

Why does my Acadia stop blowing cold air?

Oddly enough, my wife’s 2014 Acadia started doing this exact thing this week. Went left the house and within a block the a/c died. Came back home, shut off the engine and the fans were on full blast after the engine shut down. We gave it a few seconds, started it back up, and everything worked.

Why is the AC not working on my Silverado?

The fact that there has been ample opportunity for GM to fix an issue they knew about, but ignored, is something people should know about. This will also weigh heavily on future vehicle purchases. Dealing with this exact same issue right now. 2015 SIERRA SLT 44,000 miles, and now no AC due to (commonly) faulty condenser.

Why is my a / C not working on my 2014 GMC Sierra?

A/C compressor popped yesterday. 2014 Sierra with only 56,000 miles on her. Truck bogged down and almost died while backing out of a parking spot. Looked under the hood and saw the wheel on the compressor was looking sketchy and noticed a white residue that somehow got sprayed around the engine compartment.

Why is my heater not working on my GMC Sierra?

One of the most common (and inconvenient) problems with the GMC Sierra is when it has no heat coming from the heater. Not having a functioning heater makes driving much less comfortable, and can be a sign of certain issues. At the simplest level, there are two main reasons why the heater is not working.

Why is the heater not working on my Buick Enclave?

Not having a functioning heater makes driving much less comfortable, and can be a sign of certain issues. At the simplest level, there are two main reasons why the heater is not working. If it’s not coming on at all, it’s usually either the blower motor or some other wiring issue.

How does the heater work on a GMC Sierra?

At the simplest level possible, the heater works by passing hot coolant from the engine into a tiny radiator called the heater core. At this point, the blower motor blows air across the it and the newly heated air blows on to the driver and passengers. If the heater has stopped working in your Sierra, this process has failed in one way or another.

What should the pressure be on the low side of the AC?

The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. But if you see the AC low side high, high side low, such as the low side is 100 and the high side is 150, there might be problems with any of the inner components.

What should the PSI be on a Silverado Sierra?

And for every 5degreeincrease in ambient temp your psi readings will increase by 5psi. For optimal cooling it is recommended to use the lower psi.

How can I tell if my AC is low or high?

To gauge the pressure, hook up a gauge set to the AC system and record the pressures of both low and high sides. Check the ambient temperature and see if the pressures match the numbers on the pressure chart. Compare the pressure readings with the pressure chart.

Why is my AC not working on my GMC Sierra 1500?

Learn if it’s a simple fix or time to seek out a trusted technician. Not your vehicle? Why Isn’t My A/C Working? What are common reasons my GMC Sierra 1500 has air conditioning problems?

And for every 5degreeincrease in ambient temp your psi readings will increase by 5psi. For optimal cooling it is recommended to use the lower psi.

Is the a / C running on my GMC Truck?

It runs and gets somewhat cool but does not get cold. Not even cool enough in 85 degree temps to be comfortable. He checked the freon levels and they were actually high so he got it to the normal levels. No leaks. He checked the filter and it was good but went ahead and replaced it. The compressor is running.

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