[V8] Climate Control blower out of control

[Ed Kellock]

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.

Ed

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 fuse.
> >
> > 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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