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

50,805

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

35,805

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

3 out of 3 people think this is helpful.

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

35,805

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

35,805

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

35,805

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

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 62,274 nationwide Sierra 1500 listings starting at $1,395.

ZIP:

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 4,780
#2 John Saffrahn
John Saffrahn
Reputation 3,360
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 2,960
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,298 Great Deals out of 155,159 listings starting at $1,395
Used Ford F-150
2,702 Great Deals out of 211,804 listings starting at $1,000
Used GMC Sierra 2500HD
137 Great Deals out of 13,469 listings starting at $2,997
Used Dodge Ram 1500
530 Great Deals out of 12,828 listings starting at $1,995
Used Toyota Tundra
588 Great Deals out of 30,722 listings starting at $2,637
Used Chevrolet Silverado 2500HD
328 Great Deals out of 25,711 listings starting at $2,500
Used Toyota Tacoma
620 Great Deals out of 35,105 listings starting at $2,155
Used GMC Yukon
520 Great Deals out of 17,125 listings starting at $1,799
Used Chevrolet Tahoe
778 Great Deals out of 28,448 listings starting at $1,500
Used Ford F-250 Super Duty
397 Great Deals out of 45,060 listings starting at $2,000
Used Chevrolet Colorado
264 Great Deals out of 19,414 listings starting at $1,995
Used GMC Canyon
100 Great Deals out of 7,702 listings starting at $2,500
Used GMC Sierra 1500HD
6 Great Deals out of 112 listings starting at $3,900

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
23 Great Deals out of 35,661 listings starting at $23,699
2016 GMC Sierra 1500 For Sale
53 Great Deals out of 3,968 listings starting at $18,219
2015 GMC Sierra 1500 For Sale
122 Great Deals out of 4,040 listings starting at $14,988
2014 GMC Sierra 1500 For Sale
149 Great Deals out of 4,386 listings starting at $14,495
2013 GMC Sierra 1500 For Sale
88 Great Deals out of 2,376 listings starting at $9,988