Rear Ac Blowing Warm

[charlie5001]

My 2003 GMC Yukon is blowing warm air from the rear AC while the front system is blowing cold.

 

Static pressure is 75psi at 85F ambient, so I don't think it is low on freon.

 

The low side line feels cold past the "Y" going to the front system and warm going to the rear system. I suspect a clogged rear expansion valve. Dang!

 

If the rear low line is not cold past the Y, could it still be a blend door or controller problem?

 

Thanks in advance for any advice.

 

Chuck

[therick]

Did you ever get this fixed/ I am having the same issues with my rear ac.

 

thanks

[SlowGt]

my money's on a bad temperature sensor...only because i've had issues with mine in the past