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Old 02-05-2019, 01:13 PM   #1
muley
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heater woes

Hello all,
I've got a 1989 GMC K2500 reg cab and the heater is stuck on defrost. How do I fix this? Is this cable activated or does it have a blend motor?
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Old 02-05-2019, 04:14 PM   #2
95 S_Trucker
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Re: heater woes

There are 2 styles. The base model trucks have a cable. The higher end trucks have a blend door actuator.

Does your HVAC control have a screen, If so, you have a blend door actuator.
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Old 02-05-2019, 05:24 PM   #3
muley
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Re: heater woes

Thanks! Very basic slide arm controls. I'll explore behind the dash and see if I can't find the problem.

Thank you.
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1958 Alaskan Camper all original
WORK : A necessary evil that finances
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