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1991 GMC K1500 heater problem

Discussion in 'Chevy Trucks' started by bison1973, Oct 5, 2004.

  1. bison1973

    bison1973 Member
    Messages: 69

    I have no heat on this '91 half-ton. All controls on the heat -A/C panel work except for adjusting the temp (A/C, fan, etc. all work). You can push the button and the pointer will go to hot but there is no actual heat. Any ideas?

    Thanks, Tim.
  2. Robhollar

    Robhollar Senior Member
    Messages: 766

    Vac Leak????????
  3. Guy

    Guy Member
    from Alaska
    Messages: 46

    that control is all electronic, may want to pick one up at your local used parts dealer for $60- $75, rather than $150 plus at the dealer.
    Before you do that, see if there is a valve in the heater hose, and check that for proper operation. See if both hoses to and from heater core get hot.