OT Rear heat Chevy Uplander

55 50 Ron · Nov 20, 2015

Anyone have trouble getting heat to the rear vents on a Chevy Uplander van? I'm getting heat in the front seats, but just cold air in the rear. Is there a switch or valve somewhere that I need to find and change? Thanks Ron

John M · Nov 20, 2015

You talking about the vents on the ceiling? If so, make sure the rear heat controls are turned off.

Sprint 6 · Nov 20, 2015

There is no valve on those that I know of. I do know that system does not move coolant well through the heating system unless the engine rpm is up off idle. We used to get complaints about the heat cooling off at long stop lights and there was not much to do. If there is air in the system from any kind off leak, the problem is worse. I would try bleeding the system first and make sure it is full.

4play · Nov 20, 2015

I would start by checking the temps of both coolant pipes running back the rear unit, its located on the LH side so look for the pipes along the frame. They should both be hot or near engine temps. If one is not hot or significantly cooler than other you might have trapped air or a restricted heater core. If both are hot then you might have a blend door actuator problem. The temp blend door actuator switches a door on the rear unit from hot to cold. I've seen plenty of actuators fail on GM products.

OT Rear heat Chevy Uplander

55 50 Ron

Well-known Member

John M

Well-known Member

Sprint 6

Well-known Member

4play

Well-known Member

Similar threads