Date:         Wed, 4 Dec 2002 13:38:50 -0500
Reply-To:     SStones <sstones@IDIRECT.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         SStones <sstones@IDIRECT.COM>
Subject:      Re: radiator fan not cycling  87 Westy
In-Reply-To:  <002f01c29bbd$a95fb060$6402a8c0@deus>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 12:50 PM 12/4/02 -0500, you wrote:
>Do a fan test first by
>removing the electrical harness at the fan thermoswitch and shorting the
>low and high speed terminals to ground.  If your fan turns on, then you
>can rule out the relay and the fan motor.  If the low speed doesn't work
>but the high does, I'd check the Fan Resistor. If both work, then it's
>either the thermoswitch or a coolant bleeding problem.  If neither work,
>then you'll need to check the voltages of the high and low terminals to
>determine if it's the relay or the fan motor.

Wait a minute.  You might not want to do that.  The thermoswitch is on the
Positive side of the fan motor.  You don't want to accidently ground wire
#3. (Red with White), and grounding either of the others would just be
grounding both sides of the motor, wouldn't do much.

One way to test the fan would be to take the connector off of the
thermoswitch and jumper the leads to each other to simulate the closing of
the switch positions.  Red/white to red/black for low speed. Red white to
both red/black and red/blue for high speed.
If the fan never comes on at all, it's not just the relay. Low speed can
operate without the relay.
That 30 amp fuse might be the best thing to check second. Page 97.116 of
the bentley being first.