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  1. #11
    Jr. Mechanic
    Join Date
    Nov 2011
    Central Illinois


    Quote Originally Posted by Rodz View Post
    2004 silverado - hot air blows out of driver side vents, pass side stays cold. Restart the truck, it returns to normal.
    Give this a try before you starting taking the dash out and buying parts.
    Same thing has happened to me a few times in the past. Usually just the passengers side. Only way to fix it was to do just what you did and shut the truck off. However, there was a thread about calibrating the HVAC module actuators. Here it is.
    Fifth post down -
    Alternate Method (w/o Scan Tool).

    ​After doing this I have not had the problem come up again.

    Read more:
    2012 Silverado 1500 LT 4X4
    2003 Suburban LT 2500 6.0L
    2004 2500HD Crew Cab LT 4x4 6.0L - SOLD

  2. #12


    Totally off the wall idea here, but I've done it in previous vehicles with success. Sometimes the door gets jammed due to a small piece of grit or particle, rather than an full actuator failure. Find a bumpy road and change the AC settings multiple times to engage the actuator door open and closed. Run the system on high to increase the chance the airflow will dislodge the particle while moving. You may dislodge the culprit particle and find your system is restored. It's a long shot, but on the off chance this IS the problem, you save $300 or several hours of work to get in there and find a french fry tip your kid shoved into a vent that has worked it's way down (or a leaf sucked in from the front.).
    2006 Vortec Max 1500
    -Custom Tune (389HP 440 Ft/lbs Trq - Dyno'd) | Volant CAI | Magnaflow Dual-in/out Exhaust w/3" stainless pipe tips | Fully Built Transmission w/ Red Eagle Clutches & Kolene Steels w/ Corvette Servos and Stage2 Shift Kit | 35K Tranny Cooler | Mobil 1 | Royal Purple Rear Diff
    -Spray-in Bed Liner
    -Premium Sound w/lifetime Satellite Radio | Leather | Sunroof | Heated Seats
    -Limbstriping from USING the truck (those are badges of honor)

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