Blower motor issue
Thread Starter
Racer
Joined: Dec 2003
Posts: 343
Likes: 0
From: Limmen NH, The Netherlands
Blower motor issue
I have a 1999 Corvette with the standard manual temperature control unit featuring a 0 till 5 blower speed switch. Currently, the blower only works when set to 5, while settings 1 till 4 have stopped functioning over the past week. The motor was squeaking occasionally before this issue began, but the noise often stopped when the switch was adjusted to a higher or lower setting.
Questions:
1) since the blower motor still runs on full speed I think it is still ok, do you agree?
2) I suspect the motor control unit or the switch, what is likely not working?
3) I guess I ned to oil the motor a bit to prevent the squeaking, do you agree?
regards,
Rob.
Questions:
1) since the blower motor still runs on full speed I think it is still ok, do you agree?
2) I suspect the motor control unit or the switch, what is likely not working?
3) I guess I ned to oil the motor a bit to prevent the squeaking, do you agree?
regards,
Rob.
Tech Contributor
Joined: Jan 2007
Posts: 19,398
Likes: 1,139
From: Dyer, IN
Thread Starter
Racer
Joined: Dec 2003
Posts: 343
Likes: 0
From: Limmen NH, The Netherlands
Thanks, this is great info. I understand from the circuit diagram above that also the blower motor relay on the control board could be toasted.
Last edited by Rob Musquetier; Aug 15, 2025 at 01:52 AM.
Tech Contributor
Joined: Jan 2007
Posts: 19,398
Likes: 1,139
From: Dyer, IN
Not likely, because the blower works on high, and that is the relay energized position. Again, very quick voltage checks will isolate quickly.
Tech Contributor
Joined: Jan 2007
Posts: 19,398
Likes: 1,139
From: Dyer, IN
Thread Starter
Racer
Joined: Dec 2003
Posts: 343
Likes: 0
From: Limmen NH, The Netherlands
I have been able to fix the issue. The conclusion the fan motor was sort of shot drawing too much current which melted the resistors for the 1 till 4 setting.
I ordered both a new resistor circuit and a new fan. The resistor circuit arrived first but when I attached it and switched to a 1 till 4 setting it soon started to smell like burned plastics. I stopped using the 1 till 4 settings again (only used 5) and waited for the new blower motor to arrive.
Once the new blower motor arrived I swap it in the car and all worked as intended (no more smelly plastic odors and properly working 1 - 4 fan speed).
I ordered both a new resistor circuit and a new fan. The resistor circuit arrived first but when I attached it and switched to a 1 till 4 setting it soon started to smell like burned plastics. I stopped using the 1 till 4 settings again (only used 5) and waited for the new blower motor to arrive.
Once the new blower motor arrived I swap it in the car and all worked as intended (no more smelly plastic odors and properly working 1 - 4 fan speed).
