why do i have such poor heat in my 1981 gmc 1500

Asked by bobcharrois Dec 04, 2013 at 12:20 PM about the 1988 GMC Sierra 1500

Question type: Maintenance & Repair

i have replaced the thermosat many times over the years, yet the heater still does't put out. replaced heater core 3 yrs ago, and has a new radiator. help it's winter and need heat.  please note;  1981 not 1988.

1 Answer
105

David answered 10 years ago

did you try replacing your hoses it could also be you heater switch in you truck too mine was a simple vacum leak

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