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Investigating Running temperature lower than expected 200 1985

posted by  ricbelley on  Fri Dec 13 14:33 CST 2024
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last visit: Sat Jan 18 12:32 CST 2014
[RELATED]

Hi all,
My 85 245 2.3l (B230f) engine seems to run at a lower internal temperature than designed for.
Earlier in 2024 I replaced the radiator and water pump. I recently replaced spark plugs which helped getting the engine to start much faster when hot.
The car is running ok on the road with enough power to catch up with the usual traffic.
My first thought was to test the radiator thermostat. Not new. The gasket crumbled when I removed it. The thermostat was checked off the car. Seems to open at 88 deg C like it is supposed to. When I took it off it was closed but I thought that the act of removing it might have made it close. Anyway I will get a new one just because it is a cheap and easy item to replace.
Wonder next if the culprit could be the fan clutch. Anybody have experienced over-cooling due to an excessive drag on the clutch?
I know the fan on the present clutch can freely turn at rest.
Is there a way I can verify that the clutch is okay?
Maybe my temp sensor is giving a false reading on the dashboard?
I think the repair manual provides a complete graph for Temp- resistance value for this sensor. I will check.
Thanks
Richard






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