Question about 1984 Chevrolet El Camino

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Normal city driving presents no overheating problems--- sustained highway driving of speeds above 60 mph has the engine temperture climbing into the 220 degree range -installed new water pump,radiator,and thermostat. Checked fan clutch and catalytic convertor 1984 El camino /Choo-Choo SS 305 w/ac

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If you are certain that the head gaskets are good and the heads aren't cracked (they like to crack between valves) Id check the egr system...if it is blocked it can cause the engine run hotter (valve itself may be good but manifold passage may be full of carbon), as can retarded timing.(easy way to test is to just advance it a few degrees and see if temp changes) Have a hydrocarbon test done at the radiator...any combustion gasses present in there will tell you if head or gasket is leaking. If leak is small, it may only show up at higher rpms because it does not have time to escape.
Also...have you checked and verified that the gauge is accurate? Is it actually boiling over and pushing coolant out? If you have a 50/50 coolant mix, you should not be boiling at that temp. (with the right cap pressure) It is also important that the air flow is unobstructed...make sure that the a/c condenser is not plugged up with bugs or other debris. If it is, it's the same as putting cardboard in front of the radiator.

Posted on Sep 07, 2009

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Posted on Jan 02, 2017

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