Blower Motor Advice

[86GmLsCoupe]

The blower motor in my car died about two weeks ago. A couple days before I noticed the I had lost one fan speed. I wiggled the connection to the resistor on the plenum and the speed came back. A couple days later, for some odd reason the fan would cut off every time i made a left turn for a few days until it stopped working altogether. I just put in the replacement resistor tonight and the blower still doesn't come on in any setting. I checked the 30amp fuse, the connection at the motor, and wiggled the plug on the resistor again. Does anyone have any other ideas what could be causing the blower not to run? I'm going to recheck the wiring and connections over again, see about testing the blower itself and I'm guessing the control unit where the sliders are.

[1987cp]

right... I was gonna say, first things first, unplug the connector to the motor and jump that to hot and ground and make sure it at least runs.

I've had a position or two go out on the fan-speed switch before, for what that's worth.

[87_crown_vic]

sounds like something i need to figure out on Sandy... selector now only works the fan on high setting ... i need to see if it is the selector switch or the resistor setup under the hood... i need to restock on some of my parts around here...

[gadget73]

See if you get power at the blower connection before tearing into stuff. COuld be the blower just wore out. Tap it with a hammer if you have power at the plug. If it starts to run, the motor is dead.

Jim: blower resistor on the firewall is bad, or the plug is messed up. The switch is usually not much of a problem.

[87_crown_vic]

Jim: blower resistor on the firewall is bad, or the plug is messed up. The switch is usually not much of a problem.

ok... will have to try the resistor replacement when i swap on my HO upper plenum

[86VickyLX]

Sounds like your blower motor might've died mang. Make sure you're getting power to it. If you have power to it, I would go ahead and replace the blower motor. If it doesn't get power, I would check the switch.

[86GmLsCoupe]

Going to try your suggestions tomorrow and see if I can figure out what the deal is. First thing I'm going to check is if I'm getting power at the plug. I didn't have time today because I had to run to the junkyard and get a new shifter for my friends Mark VII since it fell off in her hand. The resistor wasn't my favorite thing to replace but it's doable. I ended up removing the one coolant line to the thermal blower lockout, the Map sensor and bracket, and one plug and then crammed my hand in there with those small circle socket things.

[86GmLsCoupe]

I have a quick update for you all. Today I went outside with, popped the hood, started the car and turned the air on... nothing. I then hit the blower with a block of wood 2-3 times and the fan came on. So like you said, the blowers dying so I'll be ordering one tonight.

[trwp72]

Another possibility even with hitting the blower motor is the relay right next to it... You may have jossled it when you tapped on the blower motor. That will cause one or two speeds to stop working, and do excactly what you described. Mine went out, thought it was the blower motor or switch, was told to try the relay first... thats all it was. However, the blower motor does seem to go out alot... So where ever you buy one, get a lifetime warranty one... Alot cheaper if it goes out again. Mine has gone out twice in the last 9 years, (Usually from the bearings) and the one in my car now is starting to make noise again... I even put a high amp plug on the connectors, to make it easier to take out and change!

[86GmLsCoupe]

Thanks for the advice, I',m not entirely sure what you mean about the relay though, do you perhaps mean the resistor? If so that was just replaced with a brandy new Motorcraft part. The motor in my car is original so not a bad run in the least. I found a brand new Motorcraft blower motor (Part # MM929 {#4W7Z19805AA}) listed for $39.10 + free shipping and am going to buy it. On a side note, Rockauto lists that motor as being used in Grand Marquis from 1979-2008 so at least they'll be easy enough to find in the meantime.

[gadget73]

I'm running the original blower on my car. I wonder if the aftermarket ones are just not built as well as the OEM ones. It wouldn't surprise me much.


Of course now that I said that, my motor is going to crap out on me.

[86GmLsCoupe]

Just hit it with a piece of wood.

[sxcpotatoes]

My penis is very mushy, why would I use my penis to work on your car, that would be very painful: http://jalopnik.com/5140532/roadside...yline=true&s=x

[86GmLsCoupe]

Alright guys, been about 8 months and the blower motor is finally starting to completely die. I already have the old one out, and the Motocraft replacement ready to go in. I have two questions though. The oem reaplcement takes a different style plug so I need a different connector but I'm not sure which one. It's square shaped and the 90's Crown Vic one I got from the yard won't work. The second is the gasket on the motor housing. The old one is shot and can't be swapped so I was wondering where to get a new one. Worst case I was thinking just usuing butyl rubber.

Two things I love about the job are the motor's held in by 4 scews and it just comes right out and the fact that Ford used the same style motor for over 20 years so reaplcements are easily had. The new one is a Siemens/Motorcraft
(MM929 - 4W7Z-19805AA), looks a little different but hopefully it holds up as well.

[gadget73]

Its just a foam rubber gasket. Should be able to make your own out of similar material. Its not too critical honestly.

All else failing, you could just cut the plug off your current dying motor and splice it onto the replacement.