Question about 2001 Jeep Cherokee

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2001 Jeep GC Laredo - AC cold at higher speeds but blows warm air when stopped.

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Check to see if the radiator fans go on when the ac is on if not you will need to test for power at the fans this is not only a problem for the ac it can also cause the car to overheat

Posted on Sep 30, 2009

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AC works for about 300 miles then stops and blows hot air. New AC compressor and freon charge. After sitting for a while it will again blow cold.


I think you have a similar problem to mine. At highway speeds is when it happens. And it is not blazing hot? Right?
Your evaporator is freezing up - as this happens the ice surrounding it prevents the flow of air over the evaporator coils and the result is warm air coming out of the registers. If I turn off the AC for about ten minutes and let unit melt the cold air comes back. This does not occur in stop and go driving.
I combat it by either running the fan at a higher than normal setting to increase air flow over the evaporator and then turning off when it gets too cold, OR using the air control to allow warmer outside air to enter into unit at highway speeds to prevent freezing up.
Newer cars have more sophisticated sensors and controls to prevent this but some older vehicles are subject to this anomaly.
Since it works fine under normal conditions I have not messed around with the freon level in system. If you release a tad of refrigerant the low pressure switch will shut off the compressor sooner and help minimize ice buildup. Good luck.

Aug 19, 2016 | 2000 Ford Taurus

1 Answer

How to get AC to blow cold all the time on my 2000 Volvo v70?


You'll need to have someone check the refrigerant charge with a manifold gauge.
If the low-pressure side is lower than it should be but the high-pressure side is normal or showing higher than it should, your orifice tube may be clogged.
Seriously, start by having the refrigerant pressures checked.

Jul 25, 2014 | 2000 Volvo V70

1 Answer

AC blows cold air, fans stop blowing


I think you have a "variable speed resistor" problem, it's overheating. It's an electronic device usually located near or attached to the AC motor blower that controls the fan speed. This is a common problem with aging AC blowers with electronic controls.

Apr 13, 2014 | 2001 Pontiac Sunfire

1 Answer

2005 jeep liberty blows cold air through the heater.


could be the thermostat if it was just stating to go bad,could also be a vacume problem not letting the door for the ac/heat close all the way for a few min.and if its really cold out like below 35,then its going to take longer to warm up,my jeep takes like around 20 min at idle to warm up.yours could be a case of over cooling in cold weather too ie(electric fans on before it warms up)that would be the thermostatic sensor.

Dec 01, 2011 | 2005 Jeep Liberty

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I have a '93 Jeep Grand Cherokee Laredo.(4.0 straight six) when i turn on the heat even AFTER the vehicle has warmed up it blows like it works but no hot air. and when i turn the A/C on it blows but...


I had the same problem. It turned out to be the vacuum system that works the controls. the small vacuum lines under the hood dry out and crack causing the vacuum to be lost. also check the vacuum storage canister for cracks or loose hoses. If that does not work it may be the heater/ac control is needing to be replaced.

May 20, 2011 | Jeep Grand Cherokee Cars & Trucks

1 Answer

2006 Jeep Grand Cherokee Laredo ac not cooling


My 1999 limited does this. When i bought it off the guy he said that its because of some flap down by the passengers left foot. In mine the passenger air barely even blows because of this.

Jun 17, 2009 | 1999 Jeep Grand Cherokee

1 Answer

The ac only blows warm air, have recharged it with freon but it only cools minutes before blowing warm again, could find no leaks


There are special cans of R-134A with dye in them for detecting leaks. Most leaks occur around the fittings near the compressor. Recharge the system with the leak detector can or R-134A. There are also cans of R-134A with an additive to stop leaks. I would use these products to either detect your leak or to stop it. Best of luck.
Greg

May 24, 2009 | 2001 Jeep Cherokee

1 Answer

Blowing cold air when heat is on


air blend door jammed, or you have lost vacumn to the diaphram that opens and closed that door.

Nov 22, 2008 | 2001 Chrysler Town & Country

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