![]() This causes pressure loss to the radiator leaving it with little or no pressure at all. However, when you have a bad radiator cap, the car may release coolant to the reservoir without the excess pressure trigger. Drawing the expansion tank level down will not undo the bleed if the bleeder screws are closed tight before you do this. Ideally, the engine releases coolant to the overflow reservoir to balance the pressure when it exceeds the recommended amount. Some of these are: Coolant Level Corrosion Leaky Radiator Cap Blown Head Gasket Broken Water Pump Faulty Expansion Tank When your coolant reservoir cap starts leaking, dont ignore it. I watched my upper radiator hose distort like a balloon over a few months from running my expansion tank level too high.īottom line, don't overfill expansion tank if you want to preserve your hoses and plastic coolant system parts. There are a couple of reasons that you need to be aware of when it comes to identifying the reasons why your coolant reservoir cap is leaking. Worse yet, you will expose your system to these higher pressures unnecessarily. IF you do not do this, there will be inadequate air space for the coolant to expand in the expansion tank and you will run closer or exceed the 2 bar cap rating and blow coolant. These screws should then be closed tight and the expansion tank level drawn down to the full cold level. The procedure for properly filling and venting the e39 has you fill the expansion tank to the top until no bubbles come out the thermostat housing bleeder screw first then the expansion tank bleeder screws. ![]() Is there anyone that sees flaw in my logic or experienced similar things? Does anyone know of a way to test the radiator cap? I'm just going to replace it either way but since I haven't seen this mentioned on any forums I figured I would note it here for the benefit of the community.Īdoelkins6289, read the referenced post by Founderasu and pay close attention to the explanations by on how the system pressure characteristics are driven by the coolant level in the expansion tank. My suspicion is that this is a common, root issue that goes unnoticed in many BMW's and the excess pressure leads to the failure of many other parts. I have never had the excess coolant blow out of the radiator cap like some people say it is supposed to. From my understanding many people say this is okay because the excess coolant gets blown out of the radiator cap since it has some form of a built in thermostat that opens at 200. I've had to bleed the system many times and the procedure seems to include overfilling the reservoir so that the air comes out of the radiators bleed valve. So far it has just been coolant hoses exploding and a cracked nozzle for the bleeder valve inlet on the expansion tank. Car Detailing and Show & Shine Prep sponsored by Autogeek.About a year ago I bought my 540i and ever since I have been going through the typical cooling system failure issues. ![]()
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