Originally Posted by auroralover
the blower motor on my 98 SE is only working when it wants to. It will work fine about an hour, and then when I turn the car off and then get back in and start it, no blower motor. After 10,15,20 minutes into driving, it will start working. Sounds like a short, but where should I check?
Try hitting the blower motor when it doesn't work. It'* on the firewall behind the middle of the motor. It may not be making contact after years of wear.
If you have an automatic control AC unit the blower control module that is close to the motor on top of the air handler housing (under the relay center) may not be working right. It'* accessible by removing a couple of screws holding the relay center and moving it up to gain access to the blower control module.
The blower contol modules often fail with erratic fan speed changes, strange operation, no operation, and staying on after the car is off and key removed--which drains the battery. IF you have the regular system without the auto control, you have a resistor set instead of the blower control module.
If the motor starts when vibrated, it most likely is the blower motor. You can also check by directly connecting the motor to the battery through a fused line and providing a ground. The fact it comes on after driving and bouncing would make me check blower motor first.