2004 Pontiac Grand Prix, No Blower

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.

30 discussions on “2004 Pontiac Grand Prix, No Blower”

  1. I recently encountered this issue with the blower motor working intermittently. Then just as soon as that happened it stopped working all together. I went through the steps per above and on the cabin air filter link. I did find the filter needed to be replaced and the water deflector needed to be put back into place. When I went into the car I went straight to the resistor and removed it. When I got it out, I turned it on it’s side and water started to come out. I took the whole resistor apart and found 2 burnt circuits on the control board. The resistor will need to be replaced as well because the circuit board is trashed. I will purchase and replace both items tomorrow. Figured I would mention the fact that you do need to make sure that the water deflector is in place and that the resistor is capable of taking on and holding water which will damage it. Hopefully the new style replacement resistor has been modified so that it is not able to take on and hold water. The series of checks and parts removal took me less than 5 minutes and I believe I have located the problem on my particular vehicle. The resistor did not leak water from the plug terminal when I disconnected the plug from the resistor to get the wires out of the way to get to the left screw holding the resistor up against the firewall. The connection pins were not corroded in the plug or resistor. The only visible damage to the resistor was inside on the control board so don’t think that your resistor is not the culprit when you remove the plug and do not see corrosion in the plug or on the terminals. Take it all the way out and shake it and turn it on it’s sides to check for water leaking out. The damage to it could be hidden inside just as it was on mine. I may have gotten lucky and figured it out easily because electrical parts certainly shouldn’t have water coming out of them. It hasn’t rained in here in quite a while so I am sure the problem has been a long time coming and the last good rain we got 2 days ago was the reason the issue started up. I just recently purchased this vehicle and until it rained it had worked fine.

  2. Thanks Sparky, this was a huge help for me also. The plastic retaining bosses were a real pain for me, but I was able to actually melt them off with a soldering iron and a flat head tip. I had a heck of a time finding screws to match. I guess I should of asked GM.

  3. The resistor is actually a blower speed controller and it is located to the left of the blower motor towards the firewall. You can see it in the next to the last picture in this repair article. Be sure to check/replace the cabin air filter and make sure the water deflector is in place. There is a link at the end of the above article to one about replacing the cabin air filter.

  4. I need to replace mine as well. Where is the resistor located? I to had the blown fuse but once it was replaced made a horrible noise ( came on while car wasnt on) once I turned the fan on the fuse blew again. I pulled off the panel and can see the motor assemply I’ve ordered both parts. Guess it’ll be more clear one I know what the resistor looks like :-). Awesome site BTW the photos really help a novice like myself locate where what is.

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