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08-06-2007 11:12 AM #10
You had mentioned that you checked the fan for air flow. Is the fan far enough into the shroud? The fan should be deep inside the shroud but no closer than one inch of the radiator to work properly. If its not it won't pull enough air at idle to cool the engine. If your using a fan clutch, when the engine is at operating temperature it should lock up and pull air through the rad. I would also recommend switching to a 160 thermostat to help out. Its not necessary to run a 180 stat in the old cars and, don't drill any holes in it, the factory never did nor should you! I would also check coolant flow through the radiator when its warm. Start the car when cold with the rad cap off and allow it to warm up. You will push some coolant out as it warms up but thats ok, just keep an extra gallon there to top it off when hot. Once the thermostat opens up and the engine is full warm you should see coolant stream out of the rad core into the side tank. This should be a nice strong stream, if it isn't you may have a partial blockage in the radiator or the water pump flow may be insufficient. Once warm the coolant should reach a constant level. If it keeps pushing out or has any air bubbles in it then look into the possiblity of your head gaskets being on backwards. I think that your no start and stalling when hot is a direct result of vapor lock from the overheating. Fix the overheating and it should be fine. Good luck!
That's going to be nice, like the color. .
Stude M5 build