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Old 01-23-2005, 06:26 PM
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Join Date: Jan 2005
Posts: 7
Help with High Tempeture Problem

I thought I had bad thermastat. I changed it now 3 times, 1 time it was tested and deemed to be defective, ordered a new 1 and same issue. Before thermastat went bad the car rarely got over 40c, now w/ the new one it runs at 85c idling. take the thermastat out and it runs at 40c. Took the car to a radiator shop and he said the radiator wasn't restricted or blocked. Is there a chance I could have gotten a 2nd bad thermastat ? I'm at a loss at this point. Any help would be appreciated. The car is an 84 300d turbo diesel.

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Old 01-23-2005, 06:48 PM
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Join Date: Aug 2004
Location: Baton Rouge & New Orleans, Louisiana
Posts: 207
40C is way too cold, and usually indicates a bad thermostat. 85C is perfect. If it runs somewhere between 80C and 90C you're fine. It sounds like there's nothing wrong with the new thermostat.
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Old 01-23-2005, 06:51 PM
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Join Date: Dec 2004
Location: NE Arkansas
Posts: 66
mine gets to 85 and sticks there unless its 95 outside and I got the AC on stun.
'85 300 Turbo Diesel- 308K
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Old 01-23-2005, 06:55 PM
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Join Date: Nov 2002
Location: Milford, CT
Posts: 19,307
85C is right where it should be, does it overheat when you drive it? Also I wouldn't trust a 20 year old guage, they are sometimes close but almost never right.
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Old 01-23-2005, 08:04 PM
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Like Hattie said.

85C. is perfectly normal. It will climb to 90C. in the summer and, it might even approach 100C. if the ambient is 95F. and the a/c is on full blast.

Nothing to even think about, until it gets to 110C. Then it's time to lift your right foot.
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Old 01-23-2005, 08:41 PM
Join Date: Aug 2000
Location: Holland, MI
Posts: 1,316
40C at idle = too cold
85C at idle = just fine!

Given mass-production temperature gage and sensor tolernances, I would not worry +/- 5C, so 80-90 is OK. It's more about how much it moves, or does not move with changes from idling to highway cruising. If it idles a few degrees warmer, and cools right off, you are doing fine.

Best Regards,

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