![]() ![]() They must have bled it well, otherwise it would have overheated over 1000 miles. Look for white residue, that gives the leak away. Jack up the front of the car and look up toward the water pump and thermostat. The link below contains the instructions that I followed. If its a slow leak, you wont see any coolant underneath. Of course this may be unrelated but it does sound quite similar to what you are experiencing so might be worth a try. Winter came, and it was overnight literally. Heat seems to be fading too st that time 5. When I would drive uphill and it would swish around the system it got cold again 4. I followed the correct process to remove the airlock and the problem has not returned. 3.then the coolant light came on and as the car moved, hot air came out, and the. If it has been neglected, filled from the hose and generally suffered cooling system abuse, then its possible. Depending on whether the flow to the matrix is open or closed it causes the coolant level to rise / fall and so the light to come on. I would agree, but also qualify that: if your cars been well- taken care of and had regular coolant changes then its pretty unlikely. Further investigation led me to discover that if the coolant is not filled properly then you end up with an airlock in the heater matrix. So halfway around the test drive the coolant light came on and by the time we got back to the garage it was fairly streaming out steam from under the bonnet.Īnyway, all was fixed to my satisfaction before I drove away in the car but the coolant light kept coming on. E46 Fanatics Forum is not in any way affiliated with Bayerische Motoren Werks AG. Content on E46 Fanatics Forum is generated by its users. 3) Pour coolant in slowly until it flows out of the bleed port. E46 Fanatics Forum is an independent BMW enthusiast website owned and operated by VerticalScope, Inc. 2) Open bleed screw on upper radiator hose, and open coolant tank cap. Here is how I bled the system: Start with the engine cold. I searched the forums and realized that the heat problem was probably due to air in the coolant system or low fluid levels. Bled the system twice, and it still will not put out heat at idle - only when I rev above 1500 RPM. After the job was done, I took my car for a test drive and noticed that my heat wasnt working at all. I should mention as a start that the garage I bought it from messed up and when they did the levels checks before the test drive and didn't screw the radiator cap back on properly. I had my thermostat and water pump replaced today. No more tiny crack that NEVER was easily visible. It took forever to re-fill as it lost a lot of coolant rapidly. I had a similar problem when I first got my car. FINALLY, after about 6 months, one day the low coolant light came on again, and this time it overheated instantly. ![]()
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