Rear Blower Blows Cold Air In Winter / Warm Air in summer

rhenry

Original poster
Member
Mar 5, 2012
2
In my 2004 Envoy, I get cold air blowing in the winter and warm air blowing in the summer from my rear blower. The blower motor works fine. Any help with this?
 

The_Roadie

Lifetime VIP Donor
Member
Nov 19, 2011
9,957
Portland, OR
Do you have an EXT? I have to assume you do. Your rear HVAC unit temp actuator may be dead. Have you ever heard a clicking in the right rear of the vehicle that goes away in 5-10 minutes after start-up? That's usually a clue.

I would remove the rear trim panels and look at the HVAC unit underneath, and see if the TEMP actuator moves when you move the control knob. If not, replace it. Pull the battery negative cacble while you do it, for safety because the blower speed control module has constant battery voltage on it, and also to force a system recalibration when you reconnect the battery.

The TEMP actuator is #33 in this diagram:

rearactuators-orig.jpg
 

rhenry

Original poster
Member
Mar 5, 2012
2
Yes, I have an EXT - thank you for such a quick repsonse - I will check as you advised.
 

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