Climate control blower motor was the fix. The part cost 441 dollars.
RH under hood, between blower and evaporator according to diagram. The blower control module is most likely the culprit. It was on my 87 covette ,easy to replace but cost about $150.00
The 2000 Chevrolet Corvette blower motor control module can be found behind the passenger side dashboard. You will need to remove the dashboard in order to access the module.
If your blower motor is either not turning itself off, or randomly turning itself on with the ignition off (and you have auto climate control), the problem is the blower control module. Located directly behind the blower motor, it takes information from the climate control, and is in charge of turning the blower on/off. To replace the blower control module, remove the splash shield under the passenger side dash (there's 3 plastic retainers hold it in place). The blower control module is located behind the blower motor, and is held in with 3 bolts. The 2 rearmost bolts (by the firewall) only need to be loosened, and the front one removed. The entire unit rotates down and can then be replaced.
You need to disconnect it from the circuit before you test it for resistance.
The blower control module is defective.
You will need to replace the blower motor control unit located inside the blower motor housing, this part is not the same as the part on standard explorers, it is not the same blower motor resistor.
Ifit has the c68 option (auto air) check the blower control module under the hood
For a car as old as a 1985 model, it could be that the heater blower motor control module has gone out. A new one for a 1985 Corvette is around $165 to $175 at auto parts stores.
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Remove the wiring harness from the back of your 2001 Chevrolet Corvette blower motor. Remove the blower motor retaining bolts. Remove the blower motor fan. Reverse the process to install the new blower motor.
I am having similar symptoms with my 99 Buick Regal. The blower motor will run all the time even with the keys out. When the blower isn't working neither will the cruise control. I have researched it and believe it to be the ignition switch. I have not replaced it yet, but feel that is the most logical thing. It's also possible that in your situation it may be either the Blower Control Module or a relay. However, it's likely the ignition.
What model? This probably has electronic Climate control,therefore there isn't a Blower resistor. The blower is controlled by a Blower Motor Module...its mounted on the HVAC case under the hood near/next to the blower motor.