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Wants to overheat; when heater is on the temp goes down;

(1990 Mercedes-Benz 300E)
in Beech Grove, AR on June 22, 2014
When the ac is on or sitting at idle the temp goes up. I start driving and the temp goes down. Earlier the Oil gauge just started going crazy then stopped working. Using oil but not leaking....crazy stuff but always gets me to work and back. I had the valve cover gaskets replaced last year but hummm
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Popular Answer
on June 22, 2014
check to see if the cooling fans are working
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