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

Asked by 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

75

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

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

  • 1987 gmc 1 answer

    I have a 1987 Sierra classic 5.7 liter TBI why does the electronic control module keep burning out

    1988 GMC Sierra 1500

    -

    Maintenance & Repair

  • Why is my 2009 GMC Sierra radio turning off and on by it self 1 answer

    Screen goes blank for two seconds then turns back on like nothing happened.

    2009 GMC Sierra 1500

    -

    Maintenance & Repair

  • GMC engine 2 answers

    What years will a GMC Sierra 1500 4x4 engines fit?

    2001 GMC Sierra 1500 SL 4WD Standard Cab SB

    -

    Maintenance & Repair

  • Heat 1 answer

    I have a 94 GMC Sierra 1500 2wd 4.3 motor, I have replaced heater core 3x thermostat 2x I have put new actuators in it bought new hoses, it's blowing out warm air but not hot, my defrosters aren't ...

    1994 GMC Sierra 1500 C1500 SL Standard Cab LB

    -

    Maintenance & Repair

  • When did the GMC Sierra first come out? 3 answers

    GMC Sierra 1500

    -

    General

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 4,920
#2 John Saffrahn
John Saffrahn
Reputation 3,490
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 3,070
View All

Related Models For Sale

Used Ford F-150
2,237 Great Deals out of 209,101 listings starting at $1,499
Used Chevrolet Camaro
147 Great Deals out of 32,796 listings starting at $1,995
Used GMC Sierra 2500
162 listings starting at $4,995

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
40 Great Deals out of 42,018 listings starting at $20,121
2016 GMC Sierra 1500 For Sale
96 Great Deals out of 3,781 listings starting at $18,200
2015 GMC Sierra 1500 For Sale
100 Great Deals out of 3,925 listings starting at $15,400
2014 GMC Sierra 1500 For Sale
111 Great Deals out of 4,277 listings starting at $14,495
2013 GMC Sierra 1500 For Sale
63 Great Deals out of 2,120 listings starting at $9,260