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Overheating at times. the car would drive far distances and be normal then it would overheat on the way back. i changed the thermostat and the mechanic said the water circulation is good. the car would idle for two hours or more and not overheat...i am so frustrated. The mechanic said it could be the thermoswitch now... my car is a 1998 e39 (520i). the radiator is less than one year old.
Re: Overheating at times. the car would drive far...
Install cooler running thermostat and drill 2 hole 180 degrees apart in the thermostat. bleed system twice. make sure you get all the air pockets out of the system.
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The thermostat may be stuck closed (should overheat in 10-15 minutes, maybe less if you are driving in hills or with heavy load).
Otherwise, your fan many not be working. The fan should definitely start before it overheats and it should be running when it is in an overheat condition. Fan is on the back side of radiator.
sounds like the radiator is blocked either coolant flow or ext air flow through the matrix the thermostat can get ruined when the system overheats so allways change the stat after a overheat problem GET THE RAD CHECKED FIRST if ok check the coolant pump
My retired uncle has a 97 cadillac deville sts that runs well but after a short distance or time idling begins to overheat. He has replaced the water pump, thermostat and had the radiator and head gasket checked. Unfortunately he lives in a rural area and there is no local cadillac dealership for diagnostic repairs.
hey u says that u didn't replace the thermostat yet Your thermostat is sticking. DO NOT DRIVE if the car
overheats, you can do some serious engine damage, if you haven't done so
already. Get the thermostat changed out immediately.
What happened is
your thermostat is sticking. It was stuck and you saw it overheat (and should
have stopped immediately). The added pressure from having a stuck thermostat
pushes the fluild into the overflow.
The temperature may have gone back
to normal if the thermostat "finally" opened. However, since the thermostat is
sticking, it is unreliable and I would get it replaced.
Driving when the
engine overheats can easily cause gaskets, such as the head gasket to fail and
heads to warp. If this has occurred, you're looking at a new engine.
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