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2900 Views 6 Replies 4 Participants Last post by  jay300se1988
Good day,,

My 1988 500SEL has a temp. reading problem.. the temperature sometimes climbs to 100 or 110 on the gauge, but using an electic temperature probe, it showed barely 80.

When i turn off the car and leave the ignition on, it suddenly drops around 5 deg. once started, it shows +5 again... a slight revving on neutral cuses the gauge to drop 5 to 8 degrees.. IS the temp sensor fried? or maybe i have overheatin problem...

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Check out MBL87560SEC's recent posting with a diagram of the cooling system with the thermostat. I learned that the 560 thermostat has a venting hole that needs to be aligned and correctly installed so it connects to a venting outlet. Could that be it?
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