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.