2009 SUBURBAN AC FAULT

[wal]

After vehicle and AC has been running for approx 30 mins the following occurs: cool air comes out drivers air ducts as normal, but hot air comes out of front passenger air ducts and through the rear air ducts that are in the headliner behind the front seats. Any ideas would be appreciated.

[gmtech4]

warranty the truck if applicable,,,possible actuator for passenger temp blend door ,,

 

HVAC system has codes and needs to be diagnosed sorry

 

do not throw parts at it as the labour WILL hurt the wallet

 

try a recal by disconnecting the battery and connect it again

[Doug_Scott]

Does the truck have that fancy dual zone stuff? If so, what is the passenger side set too?

[gmtech4]

yes doug it has the dual zone system