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Old 07-29-2013, 02:11 PM
Simple guy Simple guy is offline
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have you tried cleaning out the fins? squirt a hose from the inside.. other than that maybe corrosion on the inside of the radiator. Might be worth it to take it to a radiator shop to be rodded if you can see any signs of corrosion from the cap.

A coolant system is fairly simple. Fan, Radiator, heater core, pump, thermostat, coolant passages, hoses, temp sensors and the cap. just check off each part of the system and rule it out. process of elimination. it's how the pros do it. Diagnostic trees.

Edit: almost forgot the most important part- The coolant.
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