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fred

fred 2/27/2012

1998 GMC C1500 Sierra SL 6 Cyl 4.3L

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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