Car will overheat (winter/summer doesn't matter) when engine is at idle. When the engine RPM is over 2,000 (whether driving or in neutral), engine returns to normal operating temperature per the gauge and does fine. Any ideas? (have had thermostat changed and coolant flush).
Sometimes the radiator is just too plugged to respond to flushing. (happens a lot with a marginal radiator because when flushing, the solvent simply goes around the plugged area, and cannot build up enough force to break it free). From what you have written, this may be the case. Is the electric fan coming on and off at the right times? if not this also can give you similar problems. You have done the right things but may not have gotten the desired result. Hope this info helps you a bit.
good luck
I'd be wiling to bet that your radiator is partially plugged. This is not always obvious because flow is re-directed around blocked area. Bringing the revs up moves coolant through the radiator faster. The way a pump is constructed its nearly impossible for the impeller not to move coolant. pump shaft bearings and seals fail, but even then the impeller keeps right on pumping. Even if your coolant turned to pure acid, the radiator would fail long before the pump impeller would!!
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Check the water punmp it has plastic blades that break of and give you partial flow.remove the belt and the top hose spin pump with finger feal for eregularaity.
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Engine cooling fans do come on, even at idle. However, as mentioned before, if I do not increase the engine RPM to above 2000 (even while stopped), engine temp gauge will climb to red zone. If, even while stopped, I up the engine RPM to above 2000, temp gauge returns to normal. Is the water pump the problem? Does increasing the RPM of the engine allow the water pump to "pump harder" to overcome any problems with the water flow through the radiator (even after a flush)?
does the engine cooling fan work?
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