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Old 08-27-2013, 12:07 PM
ngoma ngoma is offline
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Detergent should not cause erratic temp gauge behavior. Wouldn't expect to see an air bubble in the temp sensor area EXCEPT maybe in a low coolant situation. Specifically, similar behavior (temp gauge rises sharply, then falls to below normal) can indicate a major leak since coolant loss will leave the temp sensor high and dry. The sensor cannot register the temp of steam very well.

How long has it been since the last time you drove the car on a longer trip, long enough to have reached operating temp for say, 10 minutes? Was the coolant level normal? Have you refilled since then?

1.5 miles not really far enough to reach operating temp? When you opened the hood did the engine feel or smell overheated?

It could be elec. connection or flakey gauge but verify for sure. One cannot be too careful regarding overheating these engines.

Where is the oil leaking from? Both of mine leak just under the vacuum pump area. It is NOT the vacuum pump leaking.
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1985 744 gle d24t
1985 745 gle d24t
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