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E46 coolant light on when heater on3/17/2024 ![]() ![]() If its supposed to be a closed system, is it ever "really, truly, actually OK" to need to top off with a cup or two of coolant? Or is just "not that big a problem"? To have a dealer do the pump/thermostat/housing trifecta, what would you expect all in? What about at an indy? Keith, you're getting at the issue I was alluding to in my original post. Here's another link for reputable BMW indy shops. ![]() Here's a helpful link for changing/adding coolant. It's not necessary unless you identify an existing problem with either. I wouldn't bother with the expansion tank or hoses at this point. It's a sealed system, so it has to be going somewhere. I suspect that at 60K if you're losing coolant it's probably weeping from the water pump or a crack in the thermostat housing. If you go buy the old school maintenance schedule, at 60K you want to look to replace the water pump, thermostat, and thermostat housing. If I just go to the dealer and say "please refresh my cooling system" will they know what that means? What about "please replace my expansion tank, my water pump, my thermostat and associated hoses etc."? At the dealer, what would you expect that to cost? How much do you think it would be if I bought parts online and went to an independent mechanic? Anyone want to suggest a shop close to NYC? I'm not averse to that idea, but I don't have the time, space, or skill to DIY it. I'm guessing you're all going to suggest I go ahead and do that now. My car is at 61k miles now, and as far as I know, the cooling system has never been refreshed. If it takes 1 cup of liquid and is then full (and I can't see dried coolant anywhere in the engine bay), do I just keep driving and see if the light comes back? If it never comes back, do I just move on and forget this ever happened? What if it takes 2 cups? How much would it need to take to make you confident the problem was deeper than just "coolant needs to be topped up"? (Anyone care to recommend their favorite tutorial for this admittedly simple step?) This much I'm sure I can handle, but even before doing that, I wanted to confirm what the next steps would be once I've made sure the cooling system is appropriately filled. Put the heat back on and the light came right back.įrom googling around, it seems like the next step is to get my hands on some BMW antifreeze and mix it 50:50 with distilled water and then follow the procedure to confirm the cooling system has the proper amount of liquid in it. I turned off the heat and about 30 seconds later the light went away. It was cold out, and the light came on as soon as I turned on the heat. My (yellow) coolant light came on when I started my car this evening. ![]()
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