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

37,905

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

33,415

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

33,415

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

33,415

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

33,415

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

  • 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

  • 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

  • Heater on 2005 Sierra does not work 2 answers

    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 tr...

    2005 GMC Sierra 1500 SLT 4WD Extended Cab SB

    -

    Maintenance & Repair

  • Heater in my 1992 GMC Sierra doesn't blow hot air. 3 answers

    The heater core is hot, and the doors all work but it will only blow out cold air. What is the problem? Thanks.

    1992 GMC Sierra 1500 C1500 SLE Extended Cab LB

    -

    Maintenance & Repair

  • A/C - Heater suddenly quit working 2 answers

    The Automatic A/C - Heater was working one day and the next day doing nothing. There is no air blowing (the fan is not running). I did my best to check the appropriate fuses. I checked different ...

    GMC Envoy XL

    -

    Maintenance & Repair

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 57,801 nationwide Sierra 1500 listings starting at $995.

ZIP:

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 4,500
#2 John Saffrahn
John Saffrahn
Reputation 3,130
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 2,740
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,618 Great Deals out of 148,537 listings starting at $1,800
Used Ford F-150
3,389 Great Deals out of 203,564 listings starting at $1,273
Used GMC Sierra 2500HD
122 Great Deals out of 13,837 listings starting at $1,500
Used Dodge Ram 1500
567 Great Deals out of 12,973 listings starting at $1,200
Used Toyota Tundra
670 Great Deals out of 28,111 listings starting at $1,599
Used Chevrolet Silverado 2500HD
435 Great Deals out of 29,278 listings starting at $2,998
Used Toyota Tacoma
773 Great Deals out of 33,028 listings starting at $1,900
Used GMC Yukon
538 Great Deals out of 17,748 listings starting at $1,777
Used Chevrolet Tahoe
1,065 Great Deals out of 32,283 listings starting at $1,495
Used Ford F-250 Super Duty
480 Great Deals out of 42,571 listings starting at $2,995
Used GMC Sierra 1500HD
7 Great Deals out of 124 listings starting at $4,995
Used GMC Canyon
164 Great Deals out of 8,432 listings starting at $3,500
Used Chevrolet Colorado
318 Great Deals out of 17,034 listings starting at $2,295

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
7 Great Deals out of 27,287 listings starting at $23,800
2016 GMC Sierra 1500 For Sale
75 Great Deals out of 7,495 listings starting at $19,400
2015 GMC Sierra 1500 For Sale
196 Great Deals out of 4,703 listings starting at $15,999
2014 GMC Sierra 1500 For Sale
188 Great Deals out of 4,417 listings starting at $14,971
2013 GMC Sierra 1500 For Sale
133 Great Deals out of 2,575 listings starting at $11,695