Question about 2000 GMC Sierra

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When ac is on the air blows cold for the first 30 minutes then turns warm

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: 2000 GMC Sierra 5.3 Litre, won't blow hot air

I experienced the same head ache. First attempt was to replace the thrmostat and after taking it apart I realized that there was nothing wrong with it. I then removed the plastic cover/panel located under the dash board on the passenger's side. (only a few 4-5 smalls screws) Removal will enable you to see the on/off switch/gate moving/rotating as you turn the knob to hot or cold positions, on the control panel. If that switch/gate seems to work ok, then the trouble is within the heater core. Many mechanincs suggested that I replace the heater core. A very expensive proposition.
I checked the heater core supply/intake hose and found it hot to the touch, while the return hose was nearly cold. It was definitely a heater core blockage. I removed both ends (supply and return) hose connections/clamps. They are located near the fire wall in the engine compartment. A special tool is very helpful to remove those clamps easily and to replace them as well. It can be done the old fashion way but this tool was a life saver and reduced work time to just minutes. (Tool is $70.00 bucks at auto parts store,so I borrowed mine from a mechanic/friend)
I then hooked up a garden hose to the return end of the heater core and reversed the flow of coolant/water through the heater core. My truck is a Sierra 2000 and I refuse to see how a heater core could get clogged up with clear coolant alone. To my surprise a flat piece of rubber about the size of a quarter blew out of it and the flow of water became unobstructed. I reconected the ends of the hoses to the heater core, replaced the lost antifreeze & everything returned back to normal. No money spent for something most mechanics suggested I replace control valves/switches ($280.00) replace heater core ($500.00) etc etc. I am glad I was curageous enough to tackle this myself and save a few pennies. Good luck, and I hope this will work for you.

Posted on Dec 02, 2008

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SOURCE: AC is cold, then hot..

you need the tempature blend door motor. My 01 silverado had this issue about 1 1/2 years before i was tired of messing with it they are not hard to replace. The cover (if it is still on) for passenger side floor ducts needs to be removed and the motor is near the right side of "hump" (trans tunnel) mounted horisontial with the armature pointing upwards.

Posted on Apr 27, 2009

  • 57 Answers

SOURCE: ac is blowing warm air in my 2005 sierra 2500hd duramax. Any idea

Your system has R-134 Freon in it. the 134 is made up of smaller molecules than the old R-12. The R -134 permeates through the rubber parts of the system. If the system gets too low on Freon, the compressor will stop coming on.(low pressure cut out switch). Have the system serviced with an A.C. machine that can vacuum, measure the amount of Freon in the system, and add the right amount. The machine can also inject die. Later the die will show up under a black light.This will show any leaks you may have.

Posted on May 23, 2009

  • 6 Answers

SOURCE: 2002 GMC Savana 2500 Front AC warm, rear AC cool/cold

Typical symptoms of being a little low on refrigerant.

Posted on Jun 03, 2009

emissionwiz
  • 76846 Answers

SOURCE: my ac blows cold air for the first 5-7 min then

have the low side pressure cycling switch tested.

Posted on Jun 09, 2009

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1 Answer

2002 Buick Rendezvous no heat and over heated after warming it up for over 30 minutes.


Have a pressure test done on your cooling system, you sound like you could have a leak in your system or your system just needs to have the air bled from it. Check your coolant level also, with air in the system and not enough coolant it will blow cold and cause overheating.

Mar 05, 2014 | 2002 Buick Rendezvous

1 Answer

What is the problem now? Please can you help?


If you turn on your AC on one day and nothing happens, you may be dealing with a major component failure. Your vehicle's AC system consists of a compressor, condenser, evaporator, expansion valve, a series of tubes and several fans/blowers. If either one of these components fails to do their job, it may result an entire system failure. For example, if the evaporator blower motor burns out, you will get little to no airflow through the vents.
Most modern vehicles also have safety mechanisms that may prevent a component from engaging if the pressure is low in the system due to a refrigerant leak. Refrigerant can leak for many reasons, including undone welds, loose connections, corrosion, physical damage from road debris, etc. Look for oily stains underneath your car, as they may indicate a leak. If you suspect a refrigerant leak, take your car to General Automotive. We will test the pressure and use special dyes to pinpoint the leak.
Warm Air is Coming Out Instead of Cold As you get in your car and turn on your AC, you probably expect it to be blowing hot air for the first minute or two until the system cycles through enough to cool it. But what if the air never gets cold ? Or maybe it it gets cooler, but not cold enough ? No, your car didn't get confused and turned on heat by accident. There is likely a problem with your condenser.
A condenser's job in a vehicle is to cool the warm refrigerant that was used to make the air cold in the evaporator. A condenser has coils and a fan to push the air through the coils and thus cool the refrigerant. If the condenser coils get dirty or clogged, or if the fan fails, the refrigerant won't be cooled completely, so the air will come out warm. It's best to take your vehicle to an experienced AC Repair professional to troubleshoot this problem if you don't know your way around under the hood.
Cold Air Blows Intermittently So you went for a road trip or a long drive, and after 30 minutes of driving realized that your AC suddenly stopped working or switched to blowing warm air. The cold air returns shortly, and the cycle repeats itself for as long as you are driving. What's wrong with your car?
Intermittent cooling is often caused by the components of your vehicle's AC system freezing up. Typically an iced over evaporator is the culprit. An evaporator covered in ice can't cool the air, so you would have to wait until the ice melts, which is why the cold air eventually returns. There may be numerous issues causing the icing-from a dirty cabin air filter to a blocked evaporator drain or an overcharged system. Look for puddles of water under your car-this could be a sign of a freezing problem.

Oct 25, 2017 | 1999 GMC Safari

1 Answer

01 Sebring convertible, AC was low on refrigerant, and would stop blowing cold air and start blowing warm air. I added refrigerant, and it worked perfectly for about 20 days. Now it blows cold, then it...


First of all if your system was low on refrigerant there is a leak.You can recharge and exspect the air to work,how long it will last depends on the size of the leak.Somtimes the refrigerant can have a leak prevenative but this is for very small leaks.You need to have dye put in to system and use black light to find leak.they make kits at your local auto parts store that you can buy and do this your self.If you say it worked well for about 20 days, that is a fairly large leak.The reason why the compressor is acting so erractic is because the freon has oil in it and lubracates the bearings in compressor.When the system goes low the compressor will turn on and off to protect itself.Eventually it will stop running completly.Idont think you have an electrical problem,Ithink you have a big leak.Try what I said and good luck....Brian

May 27, 2011 | 2001 Chrysler Sebring

2 Answers

I have a 2002 Acura RSX that has AC Problem. Blows very cold air, but not all the time. As long as RPM is running at drive speeds, I have cold air. However, at stop lights the air temp goes warm. If I...


your ac compressor is freezing up try not putting it on cold all the way. put thermostat towards the red jus a lil but still on the cold side to see if that helps

Apr 03, 2010 | 2002 Acura RSX

1 Answer

98 TJ 4.0 Heat and defrost blow cold air


put some card in front of rad ,do you not watch ice road truckers

Jan 09, 2010 | 1998 Jeep Wrangler

1 Answer

Air conditioning not working properly


Would have him check out side air temp sensor ,thermister and rerove control head and inspect for burned terminal.1st.

Jun 20, 2009 | 2002 Oldsmobile Silhouette

1 Answer

1998 Volvo V70 A/C Intermittent


I had exactly the same problem. When your engine is cold and off check the gap on your ac compressor with a feeler gauge, it should be between 0.3 and 0.5mm. If it is larger you need to re-shim which invloves undoing a nut on the end off the compressor and removing the clutch plate, then removing the appropriate shims (look like washers) then replace. The reason it blows warm after 10 minutes or so is because the ac compressor gets hot and the clutch gap gets too large for the electro-magnetic clutch to engage. Some people would say that you need a new compressor but all you need to do is a re-shim.

Mar 01, 2009 | 1999 Volvo V70

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