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Pelican Technical Article:

964 Rear Blower Motor Replacement

Tom Sharpes

Applicable Models:

Porsche 993 Carrera (1995-98)
Porsche 993 Carrera 4 (1995-98)
Porsche 993 Carrera 4S (1996-98)
Porsche 993 Carrera S (1998)
Porsche 993 Targa (1996-98)
Porsche 993 Turbo (1996-97)

Sooner or later you are going to have to replace the blower motor that is located in the right side of the engine compartment. One day you will start the car and think that have a cat caught in your fan because of the noise.

Don’t despair, this is an easier (and cheaper!) fix than you might think at first. Porsche has discontinued the original blower motor for the 964’s and they have replaced it with the 993 version (993-624-328-01). This is the exact same fan and for the $415 you pay Pelican Parts for it you get the complete assembly – motor, housing everything ready to pop in and drive away.

Well ALMOST !

There is one small problem. The 993 assembly is just a little bit different The bushings that the mounting bolts go through to mount to the intake manifold are a little longer than the 964 ones. It will go together (barely – with force) and look OK (if you can live with a 1/2 gap at the fan housing), but it is so much easier to do this right.

  
This is a diagram of the blower motor assembly. There are two bolts located on the right side of the unit – one in front and the other you will have to feel around a little to find under the fan. Remove the bolts and disconnect the wiring leads to the blower and the resistor. You will also need to disconnect the hoses to the distributor and rear light vents then loosen the band clamps at the top and bottom of the tube that the resistor is mounted in.


Wiggle the assemble to loosen the boot connection to the engine shroud and remove it from the engine.

  
At this time you might want to ensure your resistor was replaced in the PO2 recall. The old resistor is p/n 964-616-550-00 or 01. The new resistor is the same number except –02.


The two motor assemblies are identical with the exception of the bushings. Here they are side by side.


You will have to take the screws out of the housing to get to the bushings to swap them out. Just remove all of the screws around the outside edge and the motor section can be pulled away. After you do this to the old unit (in case you screw anything up – you do it to the old unit !) Do the same to the new unit

  
Take the bushing out of each of the units and install the shorter ones into the new fan housing. Assemble the unit and reinstall into the car.

  
The difference between the bushings doesn’t seem to be that critical, but it will cause you major headaches later when you try to install the assembly. The longer bushings hold the entire assembly away from the mounting pads (located on the intake manifold). You cannot get more than 1 turn of the bolts into the pads and you can EASILY strip out the mounting pads.

I could not figure out what was wrong when I did this because everything SEEMED to be together except the bolts did not go in as far as they were and the duct going to the engine fan housing was off just a little. The next day, I checked to see that everything was still OK and I found the front bolt had come out and the unit was not connected to the engine fan housing (see circled areas).

I took everything back apart and realized the only difference was the bushings and when I tried to bolt them to the mounting pads, I could only get a single turn of the threads to engage – obviously not enough. I tried the old bushings and everything went together just like it was before.

It is a statement about the precision of these cars that a small difference in the bushings keeps all of the other parts from lining up correctly OR you could say it is a sign that Porsche should do their homework on replacements a little better. They must have been sidetracked by the SUV !

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Comments and Suggestions:
carrera4cabrio Comments: I did the same as 1990C4S, but I bored the two bushings. however is not a simple job, specially removing and reinstalling the one near the electric connections.
May 12, 2014
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 
Lorenzo Comments: Thanks for this article. Is there a way to remove the "squirrel cage" fan from the motor and then just replace the motor, since the rest of the assembly seems fine in my case?
March 22, 2014
  Followup from the Pelican Staff: On some models, they can be knocked off and replace. Give our parts specialists a call at 1-888-280-7799. They can help you figure out if the part is available. - Nick at Pelican Parts  
rj Comments: I need to replace my left cooling fan on my 2001 Carrera
but I don't know how or how difficult this may be.
help please.
July 25, 2013
  Followup from the Pelican Staff: Not that bad. You have to remove the front wheel and the inner fender liner. You can remove the front bumper which makes the job as lot easier. - Nick at Pelican Parts  
KC_Chris Comments: I replaced the fan motor today with no problem. The hardest part is getting a socket on the lower bolt which holds the blower onto the engine.
July 10, 2013
  Followup from the Pelican Staff: Hope we were able to help - Nick at Pelican Parts  
John Comments: My 1990 964 has just returned from the garage where its had some work done on the air con unit. There's a note on the bottom that says "Top fan housing air guide boot split". Can you point me at the relevant part, please?
TIA
November 27, 2012
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 
Chris_92_964 Comments: Thanks for the good description of the change-out. It was fairly simple - a little tricky to get to the bottom bolt -still only about an hour and a half and one scratch of the head on the trunk latch. I found it helpful to loosen the 3 mounting bolts for the air duct that perches on top of the large fan assy.
December 24, 2011
  Followup from the Pelican Staff: Thanks for the feedback and additional info. Glad we could help.
- Nick at Pelican Parts
 
1990C4S Comments: I just removed the bushing from the front end and bored it to 12mm.

I pressed in roller bearing INA HK0812-2RS. This is a 12mm OB x 8mm ID x 12 mm long lubricated sealed bearing.

Reinstall and go.

If I were to do it again I would do both bushings, I think they will last a long long time.
January 31, 2011
  Followup from the Pelican Staff: Thanks for the additional info. We appreciate it.
- Nick at Pelican Parts
 
David Comments: Hello Tom:

I own a 1990 Carrera 2 964 that I enjoy working on whenever problems arise that I can tackle.

For example, I recently replaced the Alternator, Fan Hub Bearing, Cooling Fan and Belts. I did all the work myself using some technical guidance from the Pelican Website.

As a cost-saving measure, I would like to know what the level of difficulty it would be to replace the electric motor in the Rear Blower Assembly. The Original Part # for the Rear Blower Assembly is 964-624-328-00.

Do you think this is a doable project for someome with a little above average mechanical skills...or is it a job best left to a professional?

Thanks,

David Schmidt
Jacksonville, FL
E-mail: davemschmidt@aol.com
January 19, 2011
  Followup from the Pelican Staff: It's not that difficult, but you need some patience as you need to remove a lot of stuff behind the dash and work slowly. - Wayne at Pelican Parts  
Porscheguy Comments: Tom,
I have a question for ya. My cooling fan wasn't coming until I realized I had the wrong plug in it's connection. Can you tell me where does the thrid plug in this lead connects to. One is for the resistor, the other to the temp sensor. I change the plug wires awhile back and must have unplug it. See pic. Thanks

Vernard
December 31, 2010
  Followup from the Pelican Staff: I'm out of town right now, and I don't have access to my technical library, but I will copy this question to the technical forums, and perhaps someone there can assist further. - Wayne at Pelican Parts  

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