![]() You most likely need to open it up and add coolant. This is how it works when Im low (I have a slow leak and have been too lazy to tear into it). If you are not comfortable with working on the car then just follow the BMW bleeding directions - although I've found them inadequate for the occasional bimmer that had a stubborn air lock. The reason the light comes on and then seems to go off quickly is because hot coolant expands and the level will be high enough to switch it off once warmed up. I have no issues with running one of these with the cap off up to about 90C which the t-stat is already starting to open. Low Coolant Levels The most obvious and prevalent cause of coolant light activation in BMWs is running low on engine coolant in the reservoir. Here are the most common culrpits behind an inconsistent or erratic temperature warning light: 1. Use common sense - if the coolant is scalding hot - don't open the ET cap - use the bleed screw. A BMW coolant indicator that blinks on and off is almost always caused by one of several issues. You want the t-stat to at least partially open during bleeding to ensure you have full circulation - also check that heat is coming in the cabin - cause if you are not getting any heat then you might have a jammed heater valve. Occasionally revving the engine to about 2500 RPM also helps the waterpump push the coolant through the secondary channel that feeds the heater core and heater hose lines.Įdit: Now the thermostat will be closed if you start bleeding on a cold engine. 1.1 Defective Coolant Sensor 1.2 Use of Incorrect Antifreeze 1.3 Leakage in the Cooling System 1. This is done easier with the front end raised, the heater valve open (heater on) and I usually have the ET Cap off for bleeding so the system can burp easily. 1 Reasons Why Your BMW Coolant Light Goes On and Off. If your unsure if its blown or not change it anyway. At this point, the coolant fluid is going to be. While taking traffic conditions into account, safely pull off the road and switch off the engine. This will transfer some heat away from the engine. When these blow they cause the light to come on. If the coolant warning light comes on, you should do the following: Immediately turn on the heater at maximum temperature and maximum fan speed. You'll need to bleed the coolant system and top it off. As for coolant light there is a maxi fuse on the positive terminal of the battery. When the engine is revved the coolant will evacuate the expansion tank triggering the low level light - when you shut the car off and go to check the coolant level the vaccuum fills the ET so the level looks ok. Read the post above yours - you likely have an air bubble in your coolant. If the coolant light only comes on briefly, I would add about 1 cup of distilled water until you can get the coolant you are interested in.
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