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Old 02-19-2003, 09:48 AM
zorin's Avatar
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Join Date: Feb 2003
Location: Ottawa, Canada
Posts: 126
Cool Wandering Temp quage

On my 1988 E260, recently I have noticed that when
the car has reached normal operating temp, the guage will start moving erraticly and slowly between the 80 and 120 mark. It stays at high temp for few seconds then jumps down qucikly. What might be causing these symptoms?
I already have checked for air in radiator.

Any help would be appreciated.

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Old 02-19-2003, 09:56 AM
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Join Date: Jul 2002
Location: Dallas
Posts: 330
Sounds like your thermostat is suspect.
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Old 02-19-2003, 02:38 PM
zorin's Avatar
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Join Date: Feb 2003
Location: Ottawa, Canada
Posts: 126
I already changed the thermostat but that did not get rid of the problem. I also tested the temperature sensor for the gauage which was OK.
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Old 02-19-2003, 03:15 PM
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Join Date: Apr 2000
Posts: 459
I had a Saab that occasionally did the same thing, and it was always either the thermostat or air in the system just after I had changed the thermostat. Is there a procedure for bleeding the air out of your coolant system after its been opened?

On the other hand, its not impossible that your new thermostat is malfuncitoning. Considering the damage that could result from your engine overheating, I'd swap in a new one, and MAKE SURE its a real German thermostat. Generic brand thermostats from the local parts store shouldn't be trusted. They are often of different (inferior) design than OEM quality thermostats.

Lastly, barring problems with the new thermostat and bleeding air from the system, replace the coolant temperature sensor, and also check the wiring that connects to the temperature sensor. If the insulation is brittle and cracking, you could have a short somewhere that causes the erratic gauge behavior.

Good luck,

'84 300D
'90 300CE

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