Don,
Don't rush to the conclusion that there is a problem. The fan system
is automatic, and will control the speed of the fan to meet the
requirements in the cabin. You say you didn't loose cooling at all, so
the sytem may well have been satisfied. The fan may have been coasting
on low till the system told it to get busy.
The ACC system has a lot of neat features. The fan wont come on during
a cold morning till the coolant reaches a particular temperature, just
to keep from blowing cold air in your face on an already raw day.
Considerate, these cars....
As Marshall said, you can force the fan with the defrost mode.
However, if the cabin is comfortable, your system is probably working
great. If you are not at the bottom of the temp control wheel, you can
spin it to the coldest setting and demand more from the system, often
causing the fan to move to a higher speed in automatic.
Richard
K4PKV
"If God didn't want me to run high power, he wouldn't have made big
tubes" Don - W7FN
--- OK Don <[EMAIL PROTECTED]> wrote:
> The ACC fired right up this morning (80+) - and worked all the way to
> work. This evening, (98F), I could feel the compressor running, and
> feel cool air coming from the appropriate vents, at 70 MPH with the
> windows cracked, but the fan didn't come on for the first 10 miles or
> so. Then it suddenly turned on. I didn't loose cooling at all.
>
> So - I have sporatic random failures of different parts of the
> system.
> I did re-solder all the joints in the push button unit last summer,
> but I'm not discounting failure in it.
>
> Is the pushbutton unit, the control unit, or something else the most
> likely suspect???
>
>
> On 6/29/05, Richard Hattaway <[EMAIL PROTECTED]> wrote:
> > >From the quick and easy test desk:
>
> >
> > As additional information, if you really want to see how it works (
> > what ham doesn't ) then get an LED with resistor that will
> illuminate
> > when 12 V is applied. Tie wrap it to the passenger windshield
> wiper
> > and hook it across the monovalve coil. Leave enough slack for the
> > wiper to operate, and pass the wire under the trailing edge of the
> hood
> > to the Monovalve. You can observe the Pulse Width Modulation
> system
> > used to control your cabin temperature. Kinda fun in the fall,
> winter
> > and spring especially.. watching the system correct for the proper
> > temperature. In the summer it pretty much just stays on all the
> time.
> >
> > Richard
> > Salisbury NC
> > K4PKV
>
> --
> OK Don, KD5NRO
> Norman, OK
> '87 300SDL
> '81 240D
> '78 450SLC
>
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