evaporator blower motor

[Kiwi01]

85 911 coupe ... mostly stock

I have read most of the posts for r&r of the evaporator blower motor and have found them very helpful up to this point. The motor and housing are out of the car. I cannot figure out how to separate the motor from the housing. Previous posts refer to a set screw on the motor shaft ... I can't find it. the only part of the shaft that is visible is the bottom, see attached picture. The squirrel cage appears to be too large to come out of the housing. The motor is held in to the housing by an attachment with four arms that is part of the housing. I am sure there is something simple I am missing here ...

Any suggestion on how to remove the motor from the housing would be appreciated ... Thanks, Kiwi01.

[Goth]

I have not done this myself, but have been reading some posts in preparation.

I'm pretty sure you need to remove the bolts at the corners. these are the ones directly out from the 4 arms. Then the motor and cage will come out for a better access.

The post I read discussed replacing the whole plate/motor/squirrel cage as a unit with their upgraded version.

[Jim727]

The fan and motor are attached to a mounting plate which includes the four supports you see with bolts at the ends. These bolts have some sort of sealant covering the ends. The plate is inserted into the upper housing shell and the perimeter of the mounting plate is also "caulked" with a sealant - you can see that around the inside of the upper housing shell.

Remove the four bolts from outside the upper housing shell, cut away the sealant surrounding the mounting plate then pull out the mounting plate with fan and cage attached. At that point you will find the setscrew (probably under a dot of paint) and can remove the squirrel-cage fan. The motor is held in a cylindrical plastic housing by some spring clips. Take note of the orientation of the clips, how the clip hooks fit the housing, relationship of the wiring to the housing, etc., then remove the clips and slide the motor out.

Be prepared for the new motor to be slightly different than the old motor and, if so, you'll probably have to slightly modify the retaining clips to make them work on the new motor. Otherwise "installation is the reverse of removal". I resealed mine with 50-year silicone caulk and used flexible(!) foam to seal the pass-through where the piping exits the housing. Make sure everything cures fully before firing the a/c up. Be careful about correct alignment of the temp sensor tube receiver when you reassemble - it should be in good contact with the fins but not with any of the refrigerant tubes, as I recall.

While in there, it's a good opportunity to CLEAN everything up, vacuum the evaporator, etc. Check for deteriorated rubber/foam bits that need replacement. Should your evaporator need replacement - or if you just want an upgrade - I HIGHLY recommend the evaporator from Griffiths. It's a beautifully constructed serpentine-type evaporator and looks to have about 15% (by eyeball) more evaporator volume than the stock unit.

Hth.
Jim

[Kiwi01]

Thanks ...Jim! The sealant was black and until you mentioned it, it was not obvious ... at least to me. It was some sort of putty. I was able to save it and reuse it to make a nice seal. Everything has been reassembled and reinstalled into the car ... a few things were installed twice :-). The only thing I am a little shaky on is the temp sensor. It was a PITA to get the clips back on, air tube attached and everything aligned properly. Even with all of that I think it is all OK.

The blower motor runs silently ... a few lessons learned ... now it's time for a few beers.

Thanks again ... Kiwi01