What is the knocking sound in my glove box?
Behind the glove box is the cabin air filter, blower motor and AC mode actuators. Any of the mode control actuators, such as the blend or mode actuators, can cause the knocking noise when the gears inside them fail.
What happens when your blend door actuator is bad?
If your blend door actuator has gone bad in some way, it’s basically one of two problems. If that happens, the blend door won’t work, and it’s likely your temperature will just be stuck on one setting with no ability to adjust the intensity up and down, or alternate between things like the lower vents or the defroster.
How to tell which actuator is bad?
Suppose you hear a droning or faint clicking repetitively from the dashboard, around the center area, where your HVAC system control knobs are located. In that case, that indicates you have a bad blend door actuator. A faint clicking or droning sound underneath the dash is usually a blend door actuator noise.
Why is my dashboard knocking?
The three most common causes of a clicking noise from the dashboard are: Heater control module lost calibration. Faulty blend door stepper motor.
What causes a knocking noise behind the glove box?
Behind the glove box is the cabin air filter, blower motor and AC mode actuators. Any of the mode control actuators, such as the blend or mode actuators, can cause the knocking noise when the gears inside them fail. A qualified technician such as the ones at YourMechanic will have little trouble diagnosing this noise issue. Was this answer helpful?
Where does the thumping sound come from in a car?
Whenever I turn the ignition key to the position where the radio comes on, I hear a clicking/thumping sound coming from the area of the blower motor housing under the dash on the passenger side. The sound lasts for about 10 seconds and then stops.
Why does my l4-2l make a knocking sound?
It sounds like a mis-adjusted shifter linkage or a worn shift fork for 5th gear. Either or both of these could cause the 5th gear to not stay engaged… This is the A/C heater evaporator case drain. If you see coolant leaking from it then you have a blown out heater core inside the evaporator case.
What’s the clicking sound on a GM Truck?
When I have heter on and it is clicking, if I push the REC button it stops, but in that position, if I turn the heater/fan off the clicking starts again for the 30 sec.? Anyone have any imput on this. Thank you in advance …….Sherrie