The heater blower on my 1985 740T wagon does blow air, but screeches loudly, and a different pitch for the four fan speed settings. I assume I need to replace the whole motor and fan assembly. Are there any instructions with diagrams available anywhere? I read the postings below, which are helpful, but my first look at the problem was very intimidating, due to the difficulty of access.

thx

It's not like I didn't see it coming, the blower motor has squeaked on and off for 2+ years, so It was not much of a surprise when it quit. No blow at any speed. It only took me one day of driving without it to convince me a repair was unavoidable. The fuse was ok, so it had to come off:

Slide the passenger seat back, and recline the back untill it makes a comfortable legrest.

Remove the pasenger foot cover panel...hmmm, my car doesn't seem to have one.

The kick panel is in the way, unscrew the two phillips screws which affix it to the door pillar, bend the top tab out from under the upper doorway trim. While pushing the back tab forward out from under the sill plate, grab the lower forward corner of the kick panel, and bend it towards the middle of the car, it will slip right out.

Yank off the little rubber tube, and disconnect the purple wire spade connector from the motor.

Gather a nut driver, 9/32 socket(I always wondered what this one was for), 1/4" drive ratchet, and a short extension.

Undo the blower mounting bolts, starting at the back. If the ground wire is 1" from one of the regularly spaced hex screws, it can be left in place.

The blower motor housing must be rotated about half a turn before you can pull it down, and unscrew the ground wire if necessary.

Well, that was pretty easy, only took 20 minutes on my back, and the car isn't even too cold yet. Inspecting my blower motor, it looks OK, and spins fairly freely, so I hook it up to my jumpstart box. It kicks vigorously, and blows lots of air!

By the noise it had made, it seemed reasonable to assume the motor had died, but if this wasn't the case, why did it stop? A quick look around, and I saw this:
http://www.brickboard.com/GALLERY/images/2945.jpg

note 1 tab broken off, another has half a spade connector stuch to it, one wire has a burnt red cover, and another has a poor crimp job...wow, PO must have been here before me. The two bolts are for the lower passenger door hinge.

A little wiring repair...there was still a free tab, or I would have switched them all to fork style connectors. I gave the blower motor a good dose of silicone lube, and plugged it in. It ran great, So I reassembled everything, pretty much exact rerverse of removal. the airflow made kind of a loud noise which I traced to the resistor block (a 4 wire connector on the wall of the duct to the left of the blower motor). Tightened the screws holding the resistor to the duct, and it was better than ever.

Mission accomplished! I went to my dinner engagement, marveling at my quiet heat, wondering why I had waited so long to do this. Two hours later, on my way home, S Skweee Skweeeeek SkweeeeeeeEEEEEEEEEE!

They say pride comes before a fall...I am not too proud to go to Pick n Pull on half price day and spend $5.52 on a used blower motor. Tested on my 12v drill battery, it works like a champ! The second install was about 20 minutes, including the time it took to unscrew it and rotate one bolt hole further so the rubber tube would line up right...check it before you start bolting things together.

I folowed up on this repair by adjusting my sunroof, since I got the car, its been noisy on the highway, as the back sat a little low. my headliner is BEAT, so I pushed it up into the sunroof, and was able to loosen the sunroof-track screws, slide the roof up a hair and retighten. I think the PO did not know to adjust these after he restored the sunroof slide mechanism. Oh joyful luxurious car!

Always test, inspect and analyse the parts you replace. What was the failure(or was it not the problem), why did it fail, how can you prevent the same part from failing in the same way agin? I also test new parts before installing them, it saves a lot of hassles with returns. The guys at NAPA look at me a little funny when I ask them to test my new starter, but usualy do it. If not, I have jumper cables for that.

Yup, sounds like the blower motor...typical noises. I have replaced several blower motors over the years. I recommend that you do not buy an after market blower as they do not last long. You will most likely find yourself replacing it in about a year if you do. Make sure you get the correct one, there are two kinds. It is all in one not seperate parts.

Make sure you have sealant (black)to use when replacing motor. Clean surface area well before installing the new one. It really isn't that difficult. A little strange the first time due to access. Note the position of the old motor before replacing so you line up the holes correctly.

1. Remove the trim panel below the glovebox.

2. You will need to remove the bolt that hold the bottom trim to the right of the passenger seat, loosen the other one.

3. Remove the panel on the bottom right by the passenger foot area which covers the control unit.

4. Disconnect the control unit and slide it out. Remove the control unit bracket bolts and remove bracket. In other words get the whole thing out of your way.

5. Now you are left with the blower motor and several small black screw. It would be best to remove the screws in the back first, then loosen the others and remove. Note that your ground wire is connected and to which screw. It may not reach any other screw but the one it goes to now. Lower motor, disconnect small black rubber hose(cooling hose) to the right rear of motor and motor wiring connection. Remember to note the position of motor and where all your screws are.

6. Clean surface area very well. Apply sealant to motor flange and housing. Install the motor cooling hose, connect wires then begin getting all the little screws in. Start with the screws more towards the front(start with one on the left side then go screw in one on the right side, etc) and work your way around so when you get the the screws in the back the motor will be lined up correctly and it will be eassier to get those screws into the correct holes. You want the front screws to help you hold the motor in place. Make sure you connect the ground wire!!!!
7. Check that everything is working correctly. Then connect control unit bracket, insert control unit and connect. Get the trim cover back over the control unit. You may need a flat instrument to help you get the rubber seal over the trim panel by the door. Then your ago on the rest.

Hope this helps, I have an 86' don't know how much of a difference there is between the two. Always check, make sure I didn't leave anything out! I often put my feet up on my passenger door with my back on the passenger floor rather then trying to lean in and get at it.


Best of luck,

Anastasia

86' 740t wagon 366,000

From the 700/900 FAQ's:

http://www.brickboard.com/FAQ/700-900/HeatingAirConditioning.htm#HeaterBlowerMotorReplacement

http://www.brickboard.com/FAQ/700-900/HeatingAirConditioning.htm#Replacement_Blower_Motors

According to the FAQ's, you should be able to enjoy the "low cost" blower motor replacement in your '85.