I'm having problems with the front blower. The rear blower works just fine. I've checked the 40 amp fuse under the hood and it looks ok. The blower will not work at any speed, not even high. Is the motor shot, or could this be the relay? Thanks.
I forgot to mention, I ruled out the resistor block because it didn't work on high, and I think I read that the block is bypassed on high. So I'm concentrating my efforts on the relay and the motor.
Should be easy enough to figure out with a 12V test light. If you don't already have one, go buy one ($5 ??) at AutoZone or equivalent. Connect the ground clamp to a good ground and start probing where power should be starting at the 40A and 10A fuses. Then go to the blower relay amd make sure that there is always power at connections #30 and #5 (relay will be marked with numbers at the connections. If not, fuse #12 or #7 is bad, or bad connection. Now, turn on the blower motor, and probe connection #87 at relay to see if the main contacts are closing & passing current thru to the motor. If voltage is present ,relay is OK, if no voltage at #87 then relay contacts are not closing, and you need to ohm out the coil at #85 & #86. If the relay seems OK go on to the blower motor and see if 12V is present at the (DB) dark blue wire (BAT side of motor) when the motor is supposed to be running. If voltage present, and the motor isn't running, then either the motor is bad or the motor isn't completing the connection to ground thru the black/tan wire thru the blower switch to ground.
Here's a link to the schematic:
Question: if the relay is bad, will the motor still get power? I probed the wires behind the glove box leading to the motor, and the test light lit.
Well, I pulled the motor, hooked the leads directly to battery, and it did not spin. At all. I'll put a new one in and see if that does the trick.
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