heater not working

Asked by Dec 04, 2015 at 05:35 PM about the 2005 GMC Sierra 1500 SLE 4WD Extended Cab SB

Question type: Maintenance & Repair

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 noise from under the dash on the
pasenger side. the coolant lines running to/from the heater both heat up when
the truck is running.

8 Answers

72,375

Sound like a AC actuator module that controls the blend door. So the blower motor is working?

1 of 1 people found this helpful.
39,995

The clicking noise is a bad blend door motor. If you lost your fan speeds, you also need a blower motor resistor. Here is a video on what you will basically have to do if you fix it yourself....................... https://www.youtube.com/watch?v=ABRG1Vh8igE

4 of 4 people found this helpful.

Could the fan speed problems be due to miswiring to the resistor

39,995

Mlkamp, generally no. Most resistors just plug into an existing socket. If the vehicle had been miswired, the problem would have started from the get go. When the resistor begins to fail, you will lose speed 1, then over time speed 2 and so on until it fails completely.

I changed the wiring harness, possible I crossed wires

39,995

If the fan was working fine before the harness install, then yes, you may have done just that.

The plug in on the wiring harness to the blower has letters on it ( a-g ) do you know how they correlate to the wiring coming from the controls

39,995

Mlkamp, not without a wiring schematic. You may want to start a new thread with your model and year. Hopefully there's a GMC guru who would know.

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

  • my heater fan is not working properlt 2 answers

    The heater fan works at a very low speed. I can't get it to go at a faster speed

    2006 GMC Sierra 1500

    -

    Maintenance & Repair

  • Right brake light not working 4 answers

    My 80 GMC right tail not working I've replaced the bulb and replaced the bulb connector also cleaned the ground wire replaced fuse and still nothing. Any helpful suggestion could anyone think abo...

    GMC Sierra 1500

    -

    Maintenance & Repair

  • Right Rear Brake not working 1 answer

    Problem description: Right rear brake not working. I can push the pedal as hard as i can and when in dirt the tire still spins. When jacked up I and push pedal as hard as I can the right tire still ...

    1999 GMC Sierra 1500 SL Standard Cab SB

    -

    Maintenance & Repair

  • right tail light not working 1 answer

    I have a 2008 GMC Sierra Texas Edition. I broke the lens on the right tail light. All the lights still worked even though the red plastic was broken. One day I was hooking up a trailer and trying to...

    2008 GMC Sierra 1500 SL Crew Cab

    -

    Maintenance & Repair

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 68,236 nationwide Sierra 1500 listings starting at $1,800.

ZIP:

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 5,270
#2 John Saffrahn
John Saffrahn
Reputation 3,640
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 3,330
View All

Related Models For Sale

Used Chevrolet Silverado 1500
1,933 Great Deals out of 182,800 listings starting at $999
Used Ford F-150
2,090 Great Deals out of 191,495 listings starting at $290
Used GMC Sierra 2500HD
128 Great Deals out of 12,723 listings starting at $2,185
Used Toyota Tundra
449 Great Deals out of 34,299 listings starting at $1,950
Used Dodge Ram 1500
405 Great Deals out of 10,893 listings starting at $1,000
Used Toyota Tacoma
562 Great Deals out of 42,402 listings starting at $1,995
Used GMC Yukon
439 Great Deals out of 20,487 listings starting at $1,495
Used Chevrolet Silverado 2500HD
301 Great Deals out of 28,747 listings starting at $2,995
Used Chevrolet Tahoe
598 Great Deals out of 33,202 listings starting at $1,375
Used Ford F-250 Super Duty
326 Great Deals out of 43,870 listings starting at $1,450
Used GMC Canyon
98 Great Deals out of 11,941 listings starting at $3,500
Used Chevrolet Colorado
246 Great Deals out of 27,748 listings starting at $1,000
Used Nissan Titan
174 Great Deals out of 18,907 listings starting at $3,995

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
86 Great Deals out of 43,468 listings starting at $23,368
2016 GMC Sierra 1500 For Sale
96 Great Deals out of 3,460 listings starting at $17,670
2015 GMC Sierra 1500 For Sale
99 Great Deals out of 4,319 listings starting at $12,899
2014 GMC Sierra 1500 For Sale
96 Great Deals out of 4,232 listings starting at $13,995
2013 GMC Sierra 1500 For Sale
49 Great Deals out of 1,967 listings starting at $8,999

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.