Do you have under drive pullies because when I pulled mine off the temp went from running at 210 while driving and overheating when in traffic to 150 driving to 165 in traffic?
You may also have a bad clutch fan but 210 while the car is moving is high.
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James Cox
nochevy@hotmail.com
1991 Mustang LX
12.565 @109.38mph 1.764 60ft