This 2004 Pontiac Grand Prix came in with a complaint that the blower had stopped working and the customer saw smoke from under the passenger side of the dash. Inspection at the under hood fuse box found a blown 30 amp fuse.
I replaced the fuse.
The new fuse is the square pink fuse second from the left.
I checked and found the blower would work but made a terrible noise and would not turn off.
Time to change the blower motor and blower motor speed controller. I started by removing the passenger side lower hush panel by removing several push pin retainers.
I removed the courtesy light from the panel.
<
Then I could access the motor assembly for removal. Three screws and a harness connector and it was out of there. The blower motor speed controller was put on at the factory by melting retaining bosses to hold the assembly together.
I had to use a screwdriver and pry the unit from the housing and installed the new one with screws to hold it in place.
I also checked and replaced the dirty cabin air filter which is probably what helped cause this problem. Click here to see that post.
Have you also checked the connector that attaches to the blower motor? Have you done a drag test on the terminals? A drag test consists of inserting a male terminal into the female terminal in the connector and checking for physical resistance.
Oh and by the way the jumper was off when it made that noise and kicked on for a few seconds
Yes I checked the harness connectors and went as far as to unwind the tape around them and checked each wire for damage or dry rot and so forth. I will try using a jumper to the ground on the module like you stated. Last night I ran a jumper to the ground wire to the motor. Nothing happened, then all of a sudden the motor started to make a low pitched squeal and then the air came on for maybe 3 seconds then nada. This happened before when I had the stock module in. the fan is brand new (3rd one I’ve had from my shop)and tested off battery. Damn weird isn’t it? ill let you know about what you wanted me to try when it stops raining.
The most logical thing to do at this point is to attach/piggy back a ground wire to the large black wire that is not attached to the blower motor. In theory a simple voltage test should have been enough but sometimes practicality wins out. If the ground helps, look behind the radio for an in line harness connector that may have a burnt black wire or check the ground wire where it terminates to a screw or bolt in the same area. Also have you checked the terminals of the harness connectors for damage?
Took the car to Pontiac and tried the module they gave me. Still no go and they seemed stumped also. I’m figuring it has to be a ground since I have voltage on the purple wire going into the fan. Question is where? A broken wire maybe. I also took it to ice cold auto air and they wanted a whole day to try to figure it out. I’m going to try jumping a ground at each harness connector to see if I can get a idea of where (in case is a broken wire). Other than that im stumped.
I might take it to ice cold. They said $65 if I figure it out and $0 if I don’t.