Is it water pump time?

[jmo69]

I'll test that tomorrow.

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[jmo69]

I'll test that tomorrow.

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Tested it and the fan runs, both speeds. Just did a 6 mile run, 199°F on both gauges I'm good with that.

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[jc43089]

Excellent. I see 200F on my Autometer gauge with the sender in the head with a Wahler 88C thermostat.

[jmo69]

Excellent. I see 200F on my Autometer gauge with the sender in the head with a Wahler 88C thermostat.

Made a short run tonight in 74°F weather, I converted my OBD Fusion temp gauge to °C and was reading about 92°C. So we're both in the same ballpark.

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[ed323i]

Cool. Thanks for all the reports..
So, I think we can conclude that a good working thermostat, under normal conditions and with a cooling system (fan,radiator,pump,etc) in good condition, will keep coolant temperature (measured in the head) at +5 degrees above the thermostat specified temperature, more or less.

So 80 deg C thermostat -> 85 degrees C coolant temp
So 88 deg C thermostat -> 92 degrees C coolant temp
So 92 deg C thermostat -> 97 degrees C coolant temp

I still haven't measured my real temperatures, but I'll let you know when I do.
If others have some data that confirms or contradicts above assumptions, please let us know.