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Old Yesterday, 07:49 PM   #1
Adoma08
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Join Date: Jul 2016
Location: Southern Oregon
Default Running hot question

So car runs in upper 3/4 range on gauge around town and middle with heater on 1-2, runs in middle of gauge on freeway with fan off and vent open. I have replaced thermostat, Any ides on what it could be ?
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Old Yesterday, 08:43 PM   #2
2 old for this
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When was the last time you blew the bugs out of the radiator?
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Old Yesterday, 09:57 PM   #3
TestPoint
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Location: Ellijay
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Our cars are old. 30+ years of junk accumulates in the right radiator tank and blocks the flow across the horizonal tubes. The tubes themselves get restricted but can be 'rodded' out. I had my right tank removed and it was full to the point that only the top third had coolant circulation. I had back flushed it more than once without getting all the trash out.

Use an infrared thermometer to check the temp at the bottom, middle and top.
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Old Today, 12:35 AM   #4
Mr. V
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If yours is an older brick with an all metal radiator, I'd take it to a shop for cleaning and testing.

The new ones of plastic and aluminum cannot be repaired the same way so must be replaced.
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