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Under the hood. In the blower motor harness connector.
Because something on that supply line has a problem
The blower resistor controls the speeds of the blower motor Hi-resistance lower motor speed Lo-resistance higher motor speed
Sounds like a short in the wires somewhere. you will need a diagram & have to trace them.
when my car did this it was a blown fuse
It really needs to be checked out but it probably is the blower votor.
The blower motor speed resistor is burned out. The resistor is located close to the blower motor and is easy to change. Your local auto parts store will have that part for you.
If the 1990 Chevy Lumina is blowing the DIS 10 Amp fuse when the ignition is on, check to make sure that all wires coming from this fuse are grounded properly. Also check to make sure the starter is wired properly. There could also be a loose wire in the dash near the ignition.
Your blower motor working even after the car is off is a good sign. This means that the car's system is preventing your car from overheating.
The blower resistor is internally shorted to power and needs to be replaced.
The blower motor speed resistor is burned out. The resistor is usually found close to the blower motor. Auto parts stores carry that part and it is easy to replace.
where is the rear AC blower on the Chevy Astro 98