I have a 1990 535i e34. I just replaced the radiator and thermostatand
now the car is overheating. Never had a problem with it overheating
before changing rad./therm. I have bled out all the air; I think??
reason for replacing radiator was that it started leaking on the side.
any suggestions?? I am going to pull the new thermostat and see if it
You most likely need to replace your water pump. I had the same thing
happen to me and was quite boggled that changing the radiator and
thermostat did not fix the problem. Bud is also right, it is not a bad
idea to replace your hoses.
These are quite tricky to bleed all the air from and it sounds like it
is not bled completely yet.
Was the engine overheated when the radiator failed? If so it may have
caused a problem with the head gasket which is causing overheating
My guess is that there is still air in the system (I had a lot of
trouble with this the first time I did it so can understand your
frustration). The way I do it now is to start the car with the coolant
cap off and bring it up to temperature without the cap, adding coolant
as the coolant level drops. Squeezing the hose from the water pump by
hand gently as the engine warms up seems to help a lot. The small bleed
line that enters the coolant reservoir should be giving a steady stream
of water (no air bubbles) when all the air is gone.
Good luck with it and be careful, the heads on these engines do not like
to be overheated and will make you pay if they are.
Thanks for the info everyone. I changed the thermostat and put in the
old one and it runs a little cooler, but hotter than normal. I'll keep
bleeding and bleeding. any suggestions or tricks to a successful
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