Re: Ur-erratic coolant temp reading on MB

[Tom Nas <tnas@euronet.nl>]

"Jouko Haapanen" <joukoh@vtoy.fi> wrote:

>I am getting some funny readings on my 88 (MB) Urquattro coolant temp
>(digital) gauge.  The temp will rise very quickly (couple of minutes city
>driving, 10 deg C ambient) to the middle ("N") of the gauge, and then all
>of a sudden rocket to "H" and start flashing.  As soon as I start moving,
>the temp will drop from max. to N in about 5 seconds.  If I stop and rev
>the engine, it will go back up to H in a couple of seconds.  Hmmm...

>Yes, it has coolant, and yes it does circulate.  Top rad hose seems a
>little flaccid, and the  rad leaks a bit.  New rad to be installed soon
>(along with a zillion other items worn after 375 000 km such as bomb,
>shocks, springs, brake discs (4), pads, headlights, foglights, windshield,
>rear view mirror glass (2), intake hoses (all), vacuum hoses (all).....).
>But I digress.  What should I be looking for?

Mine does the very same thing. Diagnosed as a dead sensor for the auto fan
in the bottom of the rad. Easily fixed.

HTH,

Tom

 _______________________________________________________________________
 Tom Nas                                          Zeist, The Netherlands
 tnas@euronet.nl
 1987 Audi 90q 2.3E, Tizianrot metallic, 164,000km

 The function of an expert is not to be more right than other people,
         but to be wrong for more sophisticated reasons.
                                                -- David Butler