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 of 1 people found this 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 5,010
#2 John Saffrahn
John Saffrahn
Reputation 3,540
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 3,150
View All

Related Models For Sale

Used Ford F-150
2,194 Great Deals out of 206,316 listings starting at $1,499
Used Chevrolet Camaro
225 Great Deals out of 30,943 listings starting at $1,217

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
42 Great Deals out of 44,111 listings starting at $20,121
2016 GMC Sierra 1500 For Sale
78 Great Deals out of 3,645 listings starting at $17,888
2015 GMC Sierra 1500 For Sale
102 Great Deals out of 3,926 listings starting at $15,400
2014 GMC Sierra 1500 For Sale
117 Great Deals out of 4,152 listings starting at $14,495
2013 GMC Sierra 1500 For Sale
65 Great Deals out of 2,009 listings starting at $9,600

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.