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Old 08-23-2013, 06:55 PM   #4
5th Gear Member

Join Date: Jul 2012
Vehicle: 1990 lx hatch 5.0
Location: ohio
Posts: 2,337

If you are sure that your 185 thermostat is not opening then that is the problem.

If it don't open fully it will take a lot longer for the radiator to get to the temp to kick the fan on.

The gauge in the car gets up to 220 because it is taking the temp directly from the water jacket of the intake . So the engine temp is much hotter than the radiator because the thermostat is not opening.
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