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Re: ACC and Fan Speed
Posted by David Prantl (more from David Prantl) on Thu, 28 Mar 2002 20:37:01
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

>  The fan appears to be blowing at full speed (gale).
>  When I manually override fan speed by stepping down, no  reduction occurs 
>with each push of 'down' button, then  after several pushes fan just 
>reaches full stop.

The last 9k that I have seen this on ('88 9000S) had the following problem:

The heater fan motor was getting old, and drawing higher-than-normal 
electric current through it's power supply.  This power supply is regulated 
by a transistorized control unit, that is able to continuously vary the 
voltage supply to the fan and thus provide a continuously variable range of 
fan speeds at the command of the ACC2 computer.  Well, this 
fan-speed-control unit didn't like the excessive curennt demands of the 
dying fan motor, and at one point something inside it failed.  From that 
point onwards, any non-zero speed request from the ACC2 computer resulted in 
only maximum fan speed.  A fan-off request turned the fan off.  Same thing 
you're describing.

So, you could probably fix the problem right now by replacing the fan speed 
control unit, but pretty soon it might die again (and at US$125 it's NOT 
cheap!).  It's probably time for the inevitable fan motor and heater core 
replacement job, which is normally quoted at around US$650 (not including a 
new fan speed control unit).

Note to others:
If you're looking to buy a clean low-mile '93-'95 9000 CSE turbo, don't look 
for the lowest-price special, or you'll be hit with expensive repairs like 
this not so far in the future.  I've got one for sale right now in the TSN 
classifieds, which has had *every* such potential trouble component replaced 
in the 1.5 years that we've owned it !

Best regards,

David Prantl
david_prantlno39sdcx6spamx782hotmail.com
'84 900S, 5M, 210kMi, RIP as of 2/98
'89 900, 3A, 116kMi, restored and SOLD on 3/24/01
'86 9000T, 5M, 196kMi
'88 9000S, 5M, 142kMi
'90 9000S, 4A, 138kMi
'93 9000CSET, 5M, 74kMi  ---FOR SALE---
'97 9000CSET, 5M, 60kMi
'68 97 Sonett V4, 4M, 76kMi, #000467

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