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Poor heat

Discussion in '1982-Present GM Diesel' started by JORGE, Feb 9, 2003.

  1. JORGE

    JORGE 1/2 ton status

    Joined:
    Jan 10, 2001
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    Location:
    VITORIA-GAZTEIZ(ALAVA)BASQUE COUNTRY,SPAIN
    Hello Friends,
    The heater on my truck doesnt warms well.The air flow is good,but with a poor heat for that cold days.
    I was thinking to change the thermostat.
    Somebody has the same trouble in his truck?
    Thanks!
     
  2. Tybee

    Tybee 1/2 ton status

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    Location:
    Centennial, CO
    Check you antifreeze level and if its full change your thermostat to a 195.
     
  3. BlueBlazer

    BlueBlazer 1/2 ton status

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    See if your heater valve opens all the way. I believe its vacuum operated. Im sure there is someone else that would know better. Maybe post this on the Garage forum.
     
  4. RLBstein

    RLBstein 1/2 ton status

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    Location:
    Pensacola, FL
    Check to see if your fresh air vent (passenger side) is stuck open. If you have low vacuum that will stay open. I believe the hot/cold lever is actually manual cable and doesnt run off vacuum. Only the zones (floor, vent, defrost) is controlled by vacuum.
     

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