Question about 1999 Chevrolet K1500

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Ac blowing hot air not warm but hot

Compressor comes on the pipes feel cold and have condensation leaking
used guage on low side and registered 24 psi
This is 1999 Silverado with the 5.3

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You have a leak/pinhole.adrian,,,

Posted on Jul 06, 2010

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  • Chevrolet Master
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There is a temp door actuator motor that is the problem,it is not working,now it is located under the dash,in the middle ,mounted to the blower box,it is flat,and has a muti-wire plug connector attached to it,it is a small connector,with small wires,this can be changed out easy.this is the problem,if this was at all helpful,please rate,the napa sells this part,and it is around 38 to 48 dollars.

Posted on Jul 06, 2010

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1 Answer

Why would a 2006 Nissan Altima blowing hot air from the air conditioning system?


Look at the front of you A/C compressor with your A/C sent to max. the front of it should be moving with the rest of the pulley, if not you most likely have a leak and it's out of freon. If it's moving and still no cool are careful touch the pipes coming from the compressor, one is you hi side and the other low side. The smaller one (hi) should be warm or hot... the other (low) should be cold and sweating. If the clutch on the compressor is moving and those lines aren't hot and cold then your low on freon.

Sep 03, 2015 | 2006 Nissan Altima

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My 2002 TB a/c works for 20 min. Then does not. Checked , no leaks, clutch turns, condenser clicks until blowing hot air, replaced low pressure switch


Something to check because this has happened to me.....Make sure you have enough coolant in the radiator/overflow tank. IF the engine is running hot, the thermal switch on the AC compressor will turn it off to protect the compressor from overheating and damaging it. Don't go by the guage in the dash, it's usless. Hook up a scan tool and get the exact temp. Shouldn't be over 210 which is normal operating temp.

Aug 05, 2015 | 2002 Chevrolet TrailBlazer

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2007 Toyota Yaris blowing cold air for 1 min then starts blowing hot/warm air


Vacuum leak most likely, thus not operating air blend door.

Jul 01, 2015 | AC Cars & Trucks

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2003 Ford Excursion 6.0L diesel. A/c blows warm air, compressor was recently replaced and serpentine belt, AC was recharged, condenser, orafice tube. Fuses were checked and it still blows warm. I put it...


Check that the heater is turning off as the hot air will over come the cool air. Check that the clutch on the a/c pulley is still engaging as it the unit was over filled or has a leak from a badly fitted pipe the high low switch will not allow the compressor to work.. If the work was done professionally check that the correct gas was used and seek warranty for the problem.

Apr 04, 2013 | Cars & Trucks

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

Air cinditioning wont stay on, it switches to heat and wont shut off


What do you mean when you say it wont shut off? is it blowing hot air or do you just feel a lite flow of hot air even if you have the settings to cold?

If this is the problem that you always feel hot air at low flow and the ac goes to hot air then i would say one of two things, first if you have the selector to cold and you feel hot air then there may be a problem with the blend door, this door move to allow hot or cold air, the door may be broken or just a bad motor that controls it. keep in mind if the ac system shuts down for any reason the air then will be warm, it will be about the same temp as outside and maybe a little hotter.

this problem almost sounds like the ac compressor shuts off and then you are getting the outside air which is hot, there are many reasons for the compressor to shut off, it could be the compressor clutch heating up and disengaging , this would be due to a bad compressor clutch.

another reason is the fans are not working, the best thing to do is when the system starts to blow warm check and see if the compressor is running, start engine and look at the front of compressor, with ac off the front of it will not move, and then with ac on the front will spin, check it out and let me know, if it blows warm air and ac is not working then it may be compressor problem but if you are getting warm air and the compressor is spinning then it may be a door problem.

This is hard to check with out testing the system, so i listed a few things to check and let me know the out come. also the ac blows cold for how long before it gets hot air blowing out of the vents, good day.

May 25, 2012 | 2000 Dodge Grand Caravan

1 Answer

My ac was blowing fine and cold until my ac compressor went out. i bought a used ac compressor wit new dryer/accumulater, and orfice tube. i had that for awhile and i replaced it again because the air...


If the car was retro fitted with R134a this was a common problem. There was a low side pressure sensor that needs to be changed. R134a runs different pressures than the r12.. When you go down the road the condenser cools off the system and the pressure drops below the minimum pressure. You need to make sure that the system is fully charged, not just cold to the feel. Both pipes coming out of the firewall need to be the same temp. this makes sure that the evaporator is flooded.
I hope this helped. Re-post if you need more info. Have a nice day and good luck.

Jun 06, 2011 | 1993 Cadillac Eldorado

1 Answer

Compressor turns, holds a charge but does not blow cold air even when I turn on the outside air it blows warm air


OK, this is air-conditioning 1-0-1

You say that i holds a charge, and the compressore turns, but does the comprressor cycle on and off, as this is indicating that there is enough charge, and once there is low pressure detected, it turns the compressor on, and when it reaches a high pressure, the compressor cycles off.

Lastly, when engine running and AC on, if you feel the 2 pipes going in to the firewall, one should be hot, the other should be cold ???...is this happening ???

Mar 28, 2011 | Ford F-150 Cars & Trucks

3 Answers

98 buick century AC blows cold air on passenger side and hot air on drivers side..when we recharged the unit, it worked cold air for a few days and now blowing hot air again.


Hi. There seems to be a blockage within the system. I will list all parts to be checked by your mechanical. I would also have the blend door linkages or servos inspected for fail points along with the listed areas of concern, below:

Loose or broken drive belt
Inoperative compressor or slipping compressor clutch
Defective expansion valve
Clogged expansion valve, receiver-drier or liquid refrigerant line
Blown fuse
Leaking component: any of the parts listed above or one of the A/C lines, hoses or seals.

Instruct your mechanic to check all the above, along with the dash blend door linkages for faults.

Aug 11, 2010 | 1998 Buick Century

1 Answer

AC problem


is the compressor turning on? when you turn thwe a/c? on,
and also locate the low side line on engine compartment and feel if is cold, if it is, then your blend door system is not working,
the blend door does control the cold and hot air coming to engine.

Jul 01, 2008 | 2000 Jaguar S-Type

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