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

  • 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

  • Starting problem in damp weather 10 answers

    When my 1997 GMC Sierra 1500 sits for several day, it does not want to start

    1997 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 4,850
#2 John Saffrahn
John Saffrahn
Reputation 3,420
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 3,020
View All

Related Models For Sale

Used Ford F-150
2,464 Great Deals out of 210,791 listings starting at $895
Used Chevrolet Camaro
144 Great Deals out of 35,537 listings starting at $1,995
Used GMC Sierra 2500
4 Great Deals out of 163 listings starting at $2,400

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
34 Great Deals out of 38,922 listings starting at $21,410
2016 GMC Sierra 1500 For Sale
89 Great Deals out of 3,817 listings starting at $18,810
2015 GMC Sierra 1500 For Sale
129 Great Deals out of 4,076 listings starting at $14,999
2014 GMC Sierra 1500 For Sale
142 Great Deals out of 4,434 listings starting at $14,495
2013 GMC Sierra 1500 For Sale
73 Great Deals out of 2,287 listings starting at $8,096