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fred
fred 2/27/2012
1998 GMC C1500 Sierra SL 6Cyl4.3L - Engine
HEATER BLOWS OUT HOT AIR WHEN ON LOW SETTING COLD AIR ON HIGH SETTING
2 Answers
  • jdl
    jdl 2/27/2012
    Maybe you have sufficient flow through the heater core? With it on high are the heater hoses hot?
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    jdl
    fred 3/1/2012
    one hot one cool, ac wont shut off,running all the time.
    jdl
    jdl 3/1/2012
    Is your compressor running?
  • fred
    fred 3/1/2012
    yes,took ac relay out , have heat on high now. but which switch should i replace?
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    fred
    jdl 3/2/2012
    You shouldn't have ac unless the hvac control is set on ac. Any applicable trouble codes?
    fred
    fred 3/2/2012
    just for O2 sensor, ac button on control panel turned off ,
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