When my heater blower is on I can hear a change in the bower sound “speeds up or slows down”. Also hear a vacuums sound like the vents are closing / opening.
Ideas for what to look for?
Thanks
Vehicle 2002 Trailblazer LS too many miles
Update: Looked into this more. When I switch controls for defrost to floor heater I can hear the vent door activating and blower sound changing. It takes 1 min. to 1 1/2 min. to make the mechanical sound. So I'm thinking its a vent door control concern?
Thanks in advance for any comments on this.
Update 11/24/15: Thinking it is the resistor pack that could be the problem here? I did replace it once already long time ago but I had a couple of fan speed setting not working. My fan speed settings is working fine.
Can anyone tell me if it’s a symptom of a resistor pack going bad?
Ideas for what to look for?
Thanks
Vehicle 2002 Trailblazer LS too many miles
Update: Looked into this more. When I switch controls for defrost to floor heater I can hear the vent door activating and blower sound changing. It takes 1 min. to 1 1/2 min. to make the mechanical sound. So I'm thinking its a vent door control concern?
Thanks in advance for any comments on this.
Update 11/24/15: Thinking it is the resistor pack that could be the problem here? I did replace it once already long time ago but I had a couple of fan speed setting not working. My fan speed settings is working fine.
Can anyone tell me if it’s a symptom of a resistor pack going bad?