When I leave mine in idle, it goes up to about 80 to 90 degree C, and
then the fan comes on for a while. When left for long, the fan just
goes on and off.
Without the fan, it doesn't have a chance to get rid of the heat,
since there is no wind blowing through the radiator when it is
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Check the function of the thermoswitch which lives the the bottom corner
of the radiator
These switches die, and then the electric fan won't come on, which
results in the car
If you don't yet have a Bentley manual, buy one.
If the fan is coming on (check the fan using the procedures you can find at
www.sjmautotechnik.com) - then it is possible that you have a blown head
gasket or rad problems. I had one in my '87 5ktq - when the car was started
from cold, the temp would rise to about 100C, then fall (presumably as the
heater core is opened to the system and the colder coolant causes a net drop
in temp), then it would rise to boilover. Result was: blown head gasket in
area of Cylinder #5 (rearmost) - gasket replaced. Shortly thereafter, the
rad blew up. Forensic analysis (= tore the *^*&% thing apart to see what
was wrong) revealed a break in the gasket separating top (in) and bottom
(out) - result was that coolant was bypassing the rad. Replaced the rad
with a metal Modine rad, the gauge seldom breaks 100C now.
If you've seriously overheated the car, then you might have a warped head ~
blown head gasket as the movement between the cast iron block and aluminum
head would cause a leak. Any coolant in the oil/oil in the
coolant/discolouring of the sparkplugs (whitish residue)?
1987 Audi 5kTQ
1980 Audi 5k
1962 and '64 Auto Union DKW Junior deLuxes
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