heater not working

Aaron Mclean

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.

2 Answers


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


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

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