[Shotimes] Re: '94 ATX dual cooling fans

[Paul Nimz]

The fan kicks into high speed at 220F or so.  High speed is full voltage,
low speed uses a dropping resistor to reduce the voltage and speed.  They
operate in tandem.  Turning on the A//C when idling should turn them on low
speed.  Maybe the ECT is bad and reporting a lower than actual temp to the
PCM?

Paul Nimz
'97 TR
'93 EG mtx


----- Original Message ----- 
From: <MonsieurBoo@aol.com>
To: <SHOtimes@autox.team.net>
Sent: Tuesday, March 30, 2004 5:41 PM
Subject: [Shotimes] Re: '94 ATX dual cooling fans


> Thanks Paul for the suggestions.  Water pump is less than a month old,
done
> as part of a front 60k.  Hoses and stat likewise.  Air in system?  hard to
be
> positive there's none, but this is the first time I've seen this happen;
the
> stat opens and the temp stabilizes when airtemp is less than 70 and I go
for a
> ride.  No banging-radiator noises from steam flashing, nor has the coolant
> level in the reservoir changed since the system was refilled.  Partially
blocked
> rad is certainly possible; it and the fans are the only OEM cooling pieces
at
> this point, and I was planning to drop a new one in before summer; might
need
> to be quite a bit before summer at this rate.
>
> How-sum-ever, everyone seems to be focusing on the temp gauge reading and
> ignoring the other symptoms of increased under-hood noise and associated
smell of
> hot electrics (but not "hot engine smell" or coolant).  It was the
> combination of all three, when the cooling system seemed to have just gone
into "high
> gear", that has focused my attention on the fan motors.
>
> Can I just ask it real plain, could someone please provide a minimal
> explanation of how this two-fan system "upshifts" to increase airflow
as-needed.  And
> if one fan is primary and the other auxiliary, whether the aux fan is on
the
> driver side or passenger side.  If I know how it's supposed to work and
which
> motor to check first, I can do that and let the list know wassup.
>
> Cheers,
> Mark L.
> 94 ATX 125k
>
>
> ==============
>
> I'd say your radiator is partially blocked, your gage sensor is bad, the
> water pump impeller is worn or you have air in your system.  Does that
cover
> most stuff????
>
> Paul Nimz
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