GeorgeK

I have been having the "getting colder over time" symptom in my '89 C4, Shrek. Looking on Tore's excellent page indicated that the CCU fan was the likely culprit, and it turned out right. I have a spare CCU that I stole the fan off, but wanted another solution.
After looking up the CCU fan price from the local parts dealer ( 964.659.148.00 ), picking myself up from the floor, I investigated another solution. A search on here made me aware that there might be a solution from other car makers. Jaguar, Land Rover and Mercedes Benz came up.
So a quick search on ebay for "denso fan" turned up a motor that looked promising. The wires were clearly the same color and placement, but the support bracket and air guide tube were different. I figured for 30€, the risk is small enough. So bid I did.

What came in the mail seems promsing. Removing the support plate is easy enough (2 phillips head screws).
The air guide tube is part of the motor's plastic frame, and is held on by 2 serrated locking washers. removing these took a very small scredriver to pry them off little by little..
Then it is a matter of switching the air guide and steel support plate that line up perfectly. The connector remains to be swapped, but that is not an issue.

If it works, I will walk up to the local dealer an MOON THEM.

fuch

Nice work grasshopper!!
A moon just might be coming your OPC way....

Henrik964

Brilliant! If We find a source for the big fans under the dashboard as well it would be a big thing

GeorgeK

I have been through that last year:
https://rennlist.com/forums/964-foru...a-silly-q.html

Rocket Rob

Nice job! Keep us posted. Looks like a very close replacement.

Henrik964

I saw Your thread George, I have two "used fans" I will install during next month. Have already taken everything apart once except for the last and hardest bit, getting the fans out of their cages.... Waiting to borrow the special tool...

ToreB

Great news!
We really need an alternative to the $400 spare part CCU fan.
Remember to clean the air temp sensor while you're having the CCU out.
Cheers,
Tore

GeorgeK

Thanks Tore,
Your excellent page has been a constant source of info. That and this forum have allowed me to rebuild the heating in my car for tons less than the stealer prices.
Now if someone would find a solution to the servos...

ToreB

Thanks GeorgeK.
A guy in Germany refurbish the servos, it's been discussed on the 993 forum:
https://rennlist.com/forums/993-foru...e-history.html

Cheers,
Tore

Henrik964

George, did u get it together? Did it work??

Crystal Cranks

Any update on this George did it work out, do you have a link for the ebay fan.

GeorgeK

It is together, but I have not had time to try it yet. I will update as I can.
As for the ebay link:
http://www.ebay.ch/itm/160663795659?...84.m1497.l2649

GeorgeK

Finally update, now that ski season is over.

I have installed the motor bought on evilbay. Works silently and temperature control is functional. I would say success.

RicardoD

That's grate George, but in your photos which is which part? Also what is the part number of the replacement Denso fan you ordered?

GeorgeK

The replacement part (a mercedes part it seems) is the one that does not have a 964 part number stamped on.
It seems the relevant Denso part number is the 173000