HVAC only blowing hot air

[bajagal]

2001 Yukon 1500. Front vents blowing hot air only with no change from high to low on fan. No air mixing, no a/c working. Rear vents blowing cool room air. Any suggestions?

 

[swathdiver]

2001 Yukon 1500. Front vents blowing hot air only with no change from high to low on fan. No air mixing, no a/c working. Rear vents blowing cool room air. Any suggestions?

If yours were mine I'd put a manifold on it and see if it's low on refrigerant.

 

[bajagal]

Thank you for your response. I will do that but in the meantime I disconnected the negative battery cable for a few mins. It quit blowing hot air, went back out in the morning and it’s working perfectly.

 

[Joseph Garcia]

Thank you for your response. I will do that but in the meantime I disconnected the negative battery cable for a few mins. It quit blowing hot air, went back out in the morning and it’s working perfectly.

It appears that you have a solution for your issue. Please give it a few days to confirm that it is a permanent solution, and then please add the word "FIXED" or "SOLVED" to your thread's title, to let others who are experiencing a similar issue know that this thread has an identified solution.

 

[Harpoon_23464]

2001 Yukon 1500. Front vents blow hot air only with no change from high to low on the fan. No air mixing, no a/c working. Rear vents blow cool room air. Any suggestions?

Can you hear your blend door move? And is the front system fully charged? Also sounds like your control card/ circuit card has some fried resistors on the board.