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Thread: HVAC very slow to change

  1. #1
    Join Date
    Sep 2007
    Posts
    329

    Default HVAC very slow to change

    My hvac is very slow to change direction of air from floor to defrost or, especially, to front. I know this has been discussed before and I have read that either a lever needs lubrication or an electronic component has gone bad. Does anyone have pictures of what and where I need to look in the truck to identify the problem? I have stood on my head in the truck looking under the dash in the truck for a good while but can't find anything that moves with the hvac.

    I am also wondering whether it is possible to rig the lever or whatever to be able to make the airflow direction change manually.

    Thanks!
    1997 Silverado 1500 6.5. with 185,000 miles. New fuel injection pump at 132,000 mi. FSD Heat-Sync in bumper hole, marine fuel injectors, air induction kit all from Walt at 148,000 mi. Replaced OEM Fuel Filter Assy, wastegate solenoid valve, OPS and relay at 155,000 mi. Harmonic Balancer replaced. Red dot and White dot EGR replaced. New starter, Instant Heat glow plugs, and glow plug relay/controller at 180,000. Replaced hydroboost and master cylinder in 2016.

  2. #2
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,804

    Default

    Take a look at the parts photo at the rockauto site.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  3. #3
    Join Date
    Sep 2007
    Posts
    329

    Default

    Thanks very much.
    1997 Silverado 1500 6.5. with 185,000 miles. New fuel injection pump at 132,000 mi. FSD Heat-Sync in bumper hole, marine fuel injectors, air induction kit all from Walt at 148,000 mi. Replaced OEM Fuel Filter Assy, wastegate solenoid valve, OPS and relay at 155,000 mi. Harmonic Balancer replaced. Red dot and White dot EGR replaced. New starter, Instant Heat glow plugs, and glow plug relay/controller at 180,000. Replaced hydroboost and master cylinder in 2016.

  4. #4
    Join Date
    Dec 2008
    Location
    Conesus N.Y.
    Posts
    100

    Default

    I have run into the same problem. Went to Rock auto and couldn't fird what I needed. I have a suburban and tried to check it out also. Apples to apples but couldn't really tell what opens which door etc. I guess it's a trip to the junk yard and I'll tear appart there heating unit.
    I have a 1997 horton 4X4 ambulance converted into a motor home. New hot glow plugs, remote PMD and cooler and air induction kit. New duramax fan and 180 degree thermostates. I also own two 99 suburbans.

  5. #5
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,804

    Default

    I had noise from the actuator that controls recirculation. The photo on rockauto's parts list, plus tracking the noise, allowed me to locate it.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

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