Strange electrical issue.
Heater fan stopped working completely about a week ago. Did not run on any speed, had previously worked flawlessly. As far as I could tell, the fresh air - recirc function was still working the last time I was driving the car, as I switched between them and could feel a difference. That may matter.
I ruled out the fuse, and based on my research here concluded that the resistor was not likely to be the issue.
I removed the firewall cover and blower cover today to reveal a beautiful clean motor and a blue resistor, indicating its been replaced before (definitely the resistor, possibly the motor also.) I turned on the car to test for voltage at the motor, and this is what occurred:
Initially nothing, then perhaps 0.5 seconds later I hear an electrical switch sound and the recirc button lights up, at which point the fan started blowing. All 4 speeds work. I turned the recirc off, and everything kept running. I heard another sound that was more like a physical click than an electrical switch. I turned the recirc on and off several times and everything kept working, and there were no more electrical of physical clicking sounds.
The passenger side flapper does not move when recirc is turned on and off, but moves freely by hand. The drivers side flapper still functions as it should. I have no way to know if this was already broken long ago.
My theory is that the recirc servo got jammed when the passenger side shaft was in the process of breaking. This could have somehow interrupted the whole heater circuit??? Just by removing the cover, it got freed up and is no longer jammed, or finished breaking off completely.
Is that a sound theory? Is there anything else I should be investigating?
Heater fan stopped working completely about a week ago. Did not run on any speed, had previously worked flawlessly. As far as I could tell, the fresh air - recirc function was still working the last time I was driving the car, as I switched between them and could feel a difference. That may matter.
I ruled out the fuse, and based on my research here concluded that the resistor was not likely to be the issue.
I removed the firewall cover and blower cover today to reveal a beautiful clean motor and a blue resistor, indicating its been replaced before (definitely the resistor, possibly the motor also.) I turned on the car to test for voltage at the motor, and this is what occurred:
Initially nothing, then perhaps 0.5 seconds later I hear an electrical switch sound and the recirc button lights up, at which point the fan started blowing. All 4 speeds work. I turned the recirc off, and everything kept running. I heard another sound that was more like a physical click than an electrical switch. I turned the recirc on and off several times and everything kept working, and there were no more electrical of physical clicking sounds.
The passenger side flapper does not move when recirc is turned on and off, but moves freely by hand. The drivers side flapper still functions as it should. I have no way to know if this was already broken long ago.
My theory is that the recirc servo got jammed when the passenger side shaft was in the process of breaking. This could have somehow interrupted the whole heater circuit??? Just by removing the cover, it got freed up and is no longer jammed, or finished breaking off completely.
Is that a sound theory? Is there anything else I should be investigating?
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