Heater on 2005 Sierra does not work

Asked by Feb 24, 2010 at 07:16 PM about the 2005 GMC Sierra 1500 SLT 4WD Extended Cab SB

Question type: Maintenance & Repair

I bought a 2005 Sierra SLT with 42k miles on it on Saturday 2/20/2010 from a used car dealer.  The truck looks and runs great, ran a car fax and car check and it was rated  at 93 on car check.  The truck was fine until I ran it through the car wash today and now it wants to blow cold air and the heater will not come on.  The temp guage is showing normal, could this be the heater core?  

2 Answers

25

doubtful its the core, look for a vacumm leak under the hood running to the firewall. the force of the air blowing off the car can cause this problem.

2 out of 2 people think this is helpful.
825

could be blower resistor and harness , water entered blower box

3 out of 3 people think this is helpful.

Your Answer

Add photo

Related Questions

  • heater not working 8 answers

    at first i lost high and low settings on my heater switch, then the whole switch quit working. the climate control module has been replaced. when the switch is turned on you can hear a clicking nois...

    2005 GMC Sierra 1500 SLE 4WD Extended Cab SB

    -

    Maintenance & Repair

  • Heater on my 01 GMC Sierra doesnt fully work 3 answers

    Last summer, on cool mornings, I noticed that the heater didnt start blowing hot air once up to temp. Later in the day when it was hot out, I went to turn the temp to cool, it kept blowing hot air for...

    2001 GMC Sierra 1500

    -

    Maintenance & Repair

  • how to fix 1994 gmc sierra heater to blow out hot air 8 answers

    put new thermostat and the heater is not working

    1994 GMC Sierra 1500 K1500 SL 4WD Standard Cab LB

    -

    Maintenance & Repair

  • 2005 GMC Sierra won't start 2 answers

    I have a 2005 GMC sierra 1500 (4.3L, v6, odometer 330,000+, rebuilt engine that has little less than half the odometer reading) that won't start. turn key can hear fuel pump turn on, will turn over ...

    2005 GMC Sierra 1500 STD Standard Cab LB

    -

    Maintenance & Repair

  • Driver's side heater not working on 2005 Impala. 3 answers

    I have a 2005 Chevy Impala and the heater ON THE DRIVERS side isn't working. The passenger side works fine. ??? HELP

    2005 Chevrolet Impala

    -

    Maintenance & Repair

Search GMC Sierra 1500 Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 4,630
#2 John Saffrahn
John Saffrahn
Reputation 3,240
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 2,900
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,606 Great Deals out of 152,725 listings starting at $1,500
Used Ford F-150
3,134 Great Deals out of 208,988 listings starting at $1,200
Used GMC Sierra 2500HD
154 Great Deals out of 13,288 listings starting at $3,500
Used Toyota Tundra
660 Great Deals out of 28,448 listings starting at $2,798
Used Dodge Ram 1500
517 Great Deals out of 13,131 listings starting at $1,800
Used Chevrolet Silverado 2500HD
393 Great Deals out of 27,339 listings starting at $2,998
Used Toyota Tacoma
716 Great Deals out of 32,215 listings starting at $2,750
Used GMC Yukon
570 Great Deals out of 17,251 listings starting at $1,875
Used Chevrolet Tahoe
868 Great Deals out of 28,110 listings starting at $1,700
Used Ford F-250 Super Duty
472 Great Deals out of 43,396 listings starting at $2,750
Used GMC Sierra 1500HD
4 Great Deals out of 114 listings starting at $4,500
Used GMC Canyon
126 Great Deals out of 8,079 listings starting at $2,000
Used GMC Sierra 2500
193 listings starting at $4,999

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
22 Great Deals out of 32,863 listings starting at $23,800
2016 GMC Sierra 1500 For Sale
74 Great Deals out of 4,722 listings starting at $18,710
2015 GMC Sierra 1500 For Sale
126 Great Deals out of 4,267 listings starting at $15,888
2014 GMC Sierra 1500 For Sale
171 Great Deals out of 4,281 listings starting at $8,988
2013 GMC Sierra 1500 For Sale
120 Great Deals out of 2,470 listings starting at $9,500