Quote:
Originally Posted by mclairmo
Low coolant flow is the issue, raising the rpms increases coolant flow. You must be running underdrive pulleys or have a bad water pump or there is a resitriction in the system preventing adequate coolant flow, like maybe a bad T-Stat or plugged radiator or engine coolant passages.
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That was my thinking, either the block or radiator are plugged somewhat, or there is an issue with coolant flow.
Does it have the correct waterpump? Meaning is the pump designed for the belt system you have and run in the correct direction? This can be a problem when guys swap in a later engine and then run V belts on it.
Is the outside of the radiator clean and free of bugs and other trash, dirt and grease. I have a Van out here that fried the engine because they had a trans cooler leak and the oil and dirt had half the radiator plugged.