HVAC Blower Motor Alternative
 

I thought that I had posted this before, but I guess I didn't.

For those who have a need to replace the HVAC blower motor, here are my personal notes on the process. Including the alternate part # for a MUCH cheaper version of the motor.

Essentially, you can disassemble the blower housing, which includes the electric motor and the "squirrel cage", and replace just the motor. For a lot less than a new blower assembly. The only "gotcha" with the entire process is to make sure that you drive the squirrel cage back onto the shaft of the motor to the correct clearance. Covered in the document, but also easy to figure out on your own if you just pay attention to the dimensions of the old assembly before you take it apart.

Anyway, for the cross reference:

Porsche OEM part #: 928-574-033-05 (blower housing and motor altogether)
Bosch part # for just the motor: 0130111145
Cross reference lookup for the blower motor:

• 1989-1994 Porsche 964 Carrera 2 and Carrera 4
• 1995-1998 Porsche 993 Carrera, Carrera S, Carrera 4 and Carrera 4S
• 1996-1997 Porsche 993 Turbo Coupe

I did the leg work to get the above cross references, but only by standing on the shoulders of those who had done it before but only provided a few clues as to how to find the right motor.

For the "guide" (which is mostly just a collection of photos and notes on the R&R process), I take absolutely zero credit. They are just an accumulation of photos and comments that I found useful for myself. All from other people and I forgot who I "stole" them from. Just rest assured that it's not my work :)

The key points really being surrounding the correct installation depth of the squirrel cage near the end of the document. Removing the blower housing itself is pretty easy and is well documented elsewhere. Opening up the housing is easy as well. The hardest part of the entire operation is getting the OEM connectors onto the motor terminals. Not a big deal, but a little more dexterity required than the rest of the process.

Personally, I did this with the hood removed. And that definitely made it easier.

I've been using the replacement motor for at least 10 months now (maybe a year? I lost track) and it's been flawless. Stronger than the stock motor for sure. No issues with wiring over heating or being undersized.

There is no need for any change in wiring. Stock wiring is fine for this motor.

The document with images and notes is attached.

I make no apologies for the poor organization of the document :)

Update - The motor now comes complete with the correct squirrel cage so the switch is even easier.
Thanks for sharing.

@Bulvot : You are on fire with these things!

Many thanks for sharing the information. @ROG100 : Many thanks for making this easy for us.

Cheers

The late blower motors are easy. Roger sent me both blower motors Versions and I‘m to stupid for the early variant. Has anyone tips?

Roger
How are you going with the RHD replacement option?

Cheers

Ken

Can anyone tell me if this blower motor is for LHD or RHD please: 928 624 117 00 Option Code M570 "For improved efficiency"

Cheers

ken

Ken,
I have sent Roger the bosch p/n and critical dimensions from my blower motor. Yet to hear back if he has found a suitable replacement.
Bearings were fine, stator & brushes were shot (had worn at 45° angle and 4mm deep).

Myles

Thanks Myles - keen to find out if he can source a replacement for the RHD!

Cheers

Ken

I believe I have one that is close to the dimensions supplied by Myles. I will correspond with Myles.

Porsche 928 HVAC Bosch Blower Motor
https://www.youtube.com/channel/UCTg...Blower%20Motor

URO part #: 99362432800M

Includes the squirrel cage (fan), but I don't know if the fan fits in the 928 blower housing.

The URO version can be had for about $130. Just do an internet search for the URO part #.

Personally, I prefer Bosch, but URO's price point is hard to beat.

Unfortunately does not work for the RHD blower.

Even just the motor? That's really interesting. When will the rest of the world convert to driving on the correct side?

Anyway, the part #'s I provided DO work on the LHD cars :)

The RHD motor does not have the extra ears for the larger brushes. USA/CAN/ROW LHD cars have those from 86 on so the motor and cage is very much plug & play.
So RHD and LHD early cars (pre 86) need a lot of Dremel surgery to make the motor fit. The Passat motor without the extra ears works best for these cars.

Good information. Thank you for sharing.