[Shotimes] Cooling Fan Problem - How to troubleshoot?

[Steve Weinrich]

A caveat on Jim's advice"

If the fault was due to a high  (but not infinite) resistance between the
load and the supply, you will still measure supply voltage when the load is
removed.  That means that any amount of conductivity (even through several
megohms) will still read supply voltage.  The fan won't work, but the
indicated test will pass.  Far better to test the cirucit under "full" load.

The actual failure of the fan to operatet may be a matter of the 50A fuse,
the  HIGH/LOW speed relays in in the CCRM, the ECT, the LOW SPEED dropping
resistor or even the PCM in addition the possible fan fault.

If you really want to test the fan directly, connect the battery to it
through an appropriately sized circuit protection device (fuse or breaker @
50A)

Steve



> Unplug the fan motor,  Start the car and turn on the A/C.  Check for
voltage
> at the fan connector.  If there is ~14V present, you have a bad motor.
>
> Jim
>
>
>
> -----Original Message-----
> From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
> On Behalf Of Dave Ulring
> Sent: Saturday, September 25, 2004 12:29 AM
> To: shotimes@autox.team.net
> Subject: [Shotimes] Cooling Fan Problem - How to troubleshoot?
>
>
> Hey,
>
> Had an issue yesterday where I got stuck in stop and
> go traffic.  The engine temp kept rising, so I pulled
> over and let it cool down a bit.  I then got back on
> the highway and it cooled back down.  Once back off
> the highway it started rising again and I noticed my
> cooling fan was not kicking on.  I have checked all
> obvious wiring and connections, any suggestions on how
> to test the fan before dropping $80 for a new motor?
>
> Thanks in advance,
>
> Dave
>
> 93 MTX - New oil free starter.
>
>
>
>
>
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