![]() Use on BMW coolant and distilled water to refill/top off the system. Perform on a cold car, you will loose only a slight bit of coolant due to cooling system vacuum. O-ring is no listed in the parts catalog, it is BMW Part #13621743299, about $2 and it does not require any tools to do the job, just your fingers to unlatch the connector and release the fan switch with the 2 plastic tabs. We recommend allowing your mechanic to replace the sensor as it could require removing the coolant tank. This may seem like a DIY job, but it is actually a very complex repair to tackle. ![]() ![]() Thinking that POSSIBLY they werent liars and actually flushed the cooling system there may be an air bubble I tossed some dexcool in it and carried on about my merry way. If the fan switch is wet at all and/or there is a wet mark below the lower radiator hose on the under cover, then your fan switch O-ring is leaking. When the low coolant sensor goes bad you could have a perfectly operable tank and no leaks, just a bad sensor or light that will illuminate due to a bad reading. About a week after taking it home I got the low coolant warning message on the DIC. There is an O-ring on the neck of the fan switch that shrinks and causes a slow leak. You will see something in the lower radiator hose with a small wiring connector, this is the fan switch. Look straight down on the passenger side of the radiators at the lower radiator hose. Both my 550 and the 335 before it threw low coolant alerts once or twice during their 3 year leases, with no visible signs of a leak in either case. An overheated engine can cause incredible. So, can you drive safely with your Coolant Pressure Light on The short answer is that it probably won’t get you killed, but it could mean death to your car engine. You need to check your coolant when cold and make sure you use the float properly and do not overfill the expansion tank with coolant or you WILL be replacing the expansion tank in the new few days! Many times you need to pick the float up and drop it back down to make sure the float is not stuck so you can properly gauge the coolant level.Īlso while you are under the hood, check for this very common slow leak a the fan switch in the lower radiator hose. ( 1,822) Your Coolant Pressure Light comes on when your engine is overheating due to insufficient coolant. The first thing you need to do is understand these cars have an expansion tank and there is a float level indicator inside this expansion tank. I have seen this problem often on E46 where the coolant light does not come on until the outside temps dip close to or slightly below freezing, but then do not come on if the temps stay above freezing. Note that the coolant will expand and contract quite a bit do to temperature. ![]()
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