Jan,

The temp sensor is located near the upper cooling
outlet (for the passenger heater) at the engine.
This is somewhere near the firewall. The sensor,
which switches the fan (on you '81 you may have two
of them, high and low fan rpm's) you will find at
the left uppermost corner of the radiator.

On my Golf TD I noticed that the temp will raise on stop
and go traffic and very late the radiator fan comes
up for a minute until the temp goes down again.

Regards
Helmut

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Date:    Wed, 8 Apr 1998 21:50:10 +0200
From:    "J.W.Brier" <Jan@HRPS.DEMON.NL>
Subject: temp fluctuation '81 Diesel
Can anyone tell me where the coolant temp sensor is located?
I have got all of the A/C manuals. They don't help me much with the =
diesel. I'll go ahead and order the missing manuals now so In can answer =
these simple questions myself.