Air condition do not blow hot air in cold weather

sounds like a faulty sensor

The most common cause of this is that you have a stuck air temperature control blend door, this can be a motor actuator issue or a jammed door or both (common). To replace both parts you will need to completely remove the dash from the car to access the blend door.

2001 Chevy Tahoe Heat Problem - Tahoe Forum

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Dec 5, 2008 - 10 posts - ‎7 authors 2001 Tahoe, the front heater blows a little hot air when the car warms up and then blows cold air. The rear heat seems to work fine. I changed ...

Rear AC blows hot air - Tahoe Forum - Chevy Tahoe Forum

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Jul 14, 2008 - 10 posts - ‎5 authors
On my wifes 03' Yukon the rear air conditioning blows hot air no .... Pull the panel off and look at the hot/cold actuator shown in the picture.

You have broken vent flap servos or just need calibration with Volvo diagnostic tool.

this could be a hole in an AC line trace or have the lines traced replace and replaced Freon

You will need to know if the compressor is working when it blows hot air to proceed. It could be an electrical problem, a blend door problem, or the a/c clutch on the compressor.

You have to have a good air flow through the condenser..make sure the condenser is clean and clear of debris, dirt, leaves, ect....make sure the fan or fan clutch is working properly?

The air conditioning is supposed to blow only cold air. Are you trying to get the heater to blow hot air? Make sure the temperature selector is in the hot position.

1.)If your System is OVERCHARGED this Will Occure due to the EVAPERATOR FREEZING UP
2.) Also if your HVAC Control Modual is Malfunctioning this will Aslo Cause this Condition, It Controls the BLEND DOORS that OPEN for COLD or HOT AIR Look Into these Items and Also Look Into wethrt the A/C Compressor Cycles OFF when it GETS OFF this Will POINT at the HVAC CONTROLER if it Cycles Off When Set For A/C or COLD Air

you need to get it fixed maybee u have a hole in the lines a leak it blows cold only for 1 reason low freon .u could go to a car suplyer and get r12a and fill it at home