Hear whining sound only when the heater is on.
I have a 2011 GMC Terrain I'm hearing a whining noise that starts slow and increases in volume only when the HVAC is on, then stops for 2 to 3 min then comes back again and does the same things all of the time only while the heater is on. When you turn the heater off sounds stop. It sounds like the engine or transmission but as I said when I turn off the heater the sound stops. Any suggestions?
I changed the actuator on the passenger side. When I lower the airspeed still can hear for it. It is weird comes when HVAC is ON for a 30 sec then despair for 2 to 3 min and the comes back again and repeating like that. When I turn heater OFF stops. Any more suggestions? Could it be an air motor blower ??
yes, it is, but I think I figure out where it is coming from. When clutch engage in AC compressor and starts to turn the kind of small squeaking noise coming, but I read when the clatch engages it is normal to hear kind of click and small squeaking Maybe, after all, is my imaginations ??