Duramax Lifetime Supporter
Join Date: Aug 2008
Mine did something similar last weekend.
We were driving down the road...and all of a sudden...the drivers side 2 vents started blowing hot air(I have the dual zone climate control system).
The passenger side vents were still blowing cold air.
I talked to my dad(bought the truck from him) and he said it had done it a couple times before...and that his mechanic told him a procedure to "reset the system" as he put it.
With the truck running...I turned the temp of both sides...as low as they would go...then turned the truck off.
Then I restarted the truck and turned both sides as high as they would go...and then turned the truck off again.
Once I restarted the truck the third time...it worked fine.
He said it has only done this a couple times since he bought the truck...and this procedure fixed it both times.
As of now...it's still working fine.
Mine did the exact same thing today. Fooled with the temp controls and the settings and found it would blow cold air out at the floor when that was selected but had hot on the drivers side and clod on the passenger side if the panel outlets or defroster was selected. Turned the truck off and let it set for a minute or so then restarted it. Now it is working OK. Mid 90's today so Murphy is around I guess! I'm guessing it is a blend door issue since it is still cold on the passenger side.
2005 Chevy Silverado 4x4, 285-70-17's on Hummer wheels. Banks Air inlet system w/scoop. Predator programmer, modified mouth piece.
93 Dodge D250, PDR Twins HX35&HT3B, 60+# boost,PDR stage 2 head w/o-rings, PDR Cam, modified VE Pump, piston style lift pump, modified 5" intake w/AFE, ATS ported manifold,DTT 89% converter, 4" RIP exhaust,modified tranny,EGT/boost/tranny/tach gauges.Rear sway bar.Single stage Water/Meth system installed. Oversized intercooler