[V8] Climate Control blower out of control

Korn, Bob Bob.Korn at Fike.com
Tue Nov 6 15:55:16 PST 2007

Can anyone confirm that the power stage module is the source of this
problem?   My climate control unit just started running with the blower
at full speed, it will adjust air flow to the different outlets, however
it will not turn off.  When I hit off button it directs air to floor and
fan stay at high speed, display goes out.  

PS: I was just in the area of the CC unit working on radio, not sure if
related in any way.

-----Original Message-----
From: v8-bounces at audifans.com [mailto:v8-bounces at audifans.com] On Behalf
Of Ed Kellock
Sent: Thursday, October 12, 2006 12:49 PM
To: V8 at audifans.com
Subject: Re: [V8] Climate Control blower out of control

I suggest the power stage module also.  I had this happen on my '87
5kcstq (hmmm... haven't type that in a long while) back in '95-'96.

My current 231k '91 Avant has had about 4 of them over the years but...
I'm not going to finish that sentence...  The are the only 2 experiences
with the power module going out that I _have_ had... no mention of those
I haven't... no need to tempt fate.


On 10/12/06, dsaad at icehouse.net <dsaad at icehouse.net> wrote:
> Time to think like a computer...
> If you already tried a new control head, your choices are that somehow

> an input to the head is bad - causing the fan to run on high or the 
> power stage has shorted out. This is the most likely choice based on 
> your description. The power stage is mounted in the air duct under the

> hood, passenger side and near the A/C evaporator. I am pretty sure it 
> is the same part from other type 44 cars too - so a new or junk yard 
> replacement should be easy to find. (it is a Delco part too)
> If you have the wiring diagrams, you can probably see with a volt 
> meter that the fan is on when the inputs to the power stage say it
should be off.
> Dave
> Quoting Gene <gene.ghc at verizon.net>:
> > I was just cruising down the road, when the CC blower started 
> > running at max speed.  No buttons had been pushed to initiate this.

> > Other climate control functions, like temperature and which ducts,
seem to work OK.
> > But I am unable to control the blower other than by pulling the
> >
> > I tried swapping in a known good CC control head, with no change in 
> > behavior.
> >
> > I'm wondering if there is a stuck relay somewhere?  I looked at two 
> > relay/fuse panels in the passenger footwell, but did not see any 
> > relay related to the blower motor.  I don't know if there are any 
> > other relay clusters and I can't find my manual right now.
> >
> > Gene Caldwell
> > 90 V8
> > 91 200q20v
> > 94 90S
> > 01 540i
> > _______________________________________________

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