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|3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.|
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As Brett says....
Lift the front of the car as high as you dare ! This will help to flush through the heater matrix which may have either an air-lock or even a slight blockage...
Other causes - faulty thermostat !
Is the lower hose noticeably cooler than the top hose?
Welcome to the Werkz.
How long have you had the car for?
Was any work done prior to this issue arising?
Check that the small hose that runs between the radiator and the expansion tank isn't kinked or pinched at all. Park your car with the front elevated (on ramp or similar) and put the heater on flat out, start the car and let it idle in this position to see if you can purge any trapped air from the system. Is the water pump housing heating up fairly quickly?
I have heard of the water pump impeller separating from the shaft once it heats up and expands, and contracting back onto it when it cools down, not sure on you model though.
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