Question about BMW 630i
Car overheating top of radiator hot bottom cold have changed thermostat but hasn't cured the problem
Posted by Anonymous on
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Posted on Jan 02, 2017
hi jasso, I would recommend checking the water pump if you see no flow in the radiator. Make sure when you fill up the cooling system, that you fill it cold, and that the vent screw in the radiator is loose. fill system until fluid comes out the vent screw. tighten the screw, start the car and have someone run at 1500rpm and check for flow.also, make sure that you have your temp setting full hot and blower on middle speed so that you don't trap air in the heater core.
Posted on Apr 05, 2009
SOURCE: 1990 325I overheating
have you ever replaced your fan motor? if no, have it replaced.. if yes, you probably need to replace your radiator. try to get those after market aluminum radiators. This will give your car better cooling.
Its also possible that your car's alternator is not at its best anymore thus giving low amperage to your fan motor and other electrical devices. this will slow down the RPM for your fan. This will cause your engine to overheat due to insufficient cooling.
Posted on May 03, 2009
Why was radiator replaced?Did it have heat before ? If it was plugged, the heater core may also be plugged. Try flushing it with a water hose in both directions. I dont know why the botton radiator hose would be cold, the radiator should be a uniform temp and the air coming through the radiator should be HOT, when the engine is at operating temp. What condition was the old coolant? if it was rusty, the water pump may have lower flow than normal.
Posted on Nov 19, 2009
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