Coolant light staying on after changing expansion tank

SOURCE: Water leak from top of expansion tank.2000 BMW 316i se

The water (coolant) in the expansion tank will rise and fall with the engine temperature. What the expansion tank does is collect and return coolant to and from the engine. When the engine warms up the coolant gets hot, builds up pressure and opens up the radiator cap. The coolant then goes into the expansion tank. Now when the engine cools down the pressure drops in the cooling system and the pressure drop (vacuum) pulls the coolant back into the engine via the radiator cap. The radiator cap allows the cooling system to build up pressure and by doing so increases the boiling point of the coolant, but when that pressure exceeds the caps rating the cap opens and the coolant goes to the expansion valve. The cap has another part to it that when the engine cools down and a partial vacuum is created in the cooling system a "valve" in the radiator cap opens and allows the coolant to be drawn back into the engine. I would look at your radiator cap to see if any gunk or build up is on it, and check the rubber gaskets for cracks. It's easiest just to replace the cap because they are inexpensive and easy to replace (2-10 dollars). The expansion tank should have two hoses on it. The one on the bottom comes from the radiator and the one on the top (possibly part of filler cap) runs down and is open to the ground. That way if it is overfilled or becomes overfilled it will slowly leak onto the ground. When and if you change your radiator cap, make sure the engine is cooled down, remove cap and start engine and turn heater to full blast, full heat. Leave the cap off and let it run until engine warmed up. This should burp out any air pockets that may have happened when coolant was changed. Also top off the coolant in the radiator while it is running. Hope this helps and good luck

SOURCE: Water leaking from top of expansion tank.

have you replaced the bleeder screws? and the expansion tank cap they both have O-rings that compress and will fail over time also check the hose at the top of the exp tank it also has o-rings inside it

Jim Goldsmith

• 2005 Answers
• Posted on Apr 21, 2009

SOURCE: ONGOING COOLANT LEAK

replace your coolant reservior cap; the rubber ring has become brittle and "steams" the coolant out as you drive

SOURCE: replacing a 1997 bmw 528i coolant tank

hose clamps, 1/4 hose, and 5/8 hose. Whaddya mean where is the coolant level sensor in the the tank? Look AT the tank, it's a little bit bigger than a small water bottle. Even if they wanted to hide it in there....they couldn't. You look at the filler hole at the top of the small water bottle looking tank----and bingo, there's the sensor. If someone wanted to hide an elephant in your living room, you wouldn't ask where in the living room is the elephant. Is there another question you're asking about the sensor that isn't being clearly communicated?

SOURCE: I have a 2004 BMW 330i and have replaced

We have had some similar problems with some BMW's,the last one we replaced the expansion tank.Before we attached the upper radiator hose to the radiator we filled the engine with antifreeze through the hose.Install the hose and fill your expansion tank to the proper level and run the engine to operating temperature.