![]() So from this informal test, it seems like this is some issue with the heating system. I did the exact same route as I had that morning and the result: about halfway through the low coolant warning light came on. Not sure about e46, but on the e36, you can get cracks inside the tank that allow air in to the cooling system even when the coolant level is correct. That makes the float go up and down and makes the light come on. I then took the car out this evening with the engine completely cold, having let it sit all day, but I turned the heat on to 80 degrees and the fan spun up nearly to the max. If you have air in the cooling system, the level in the expansion tank will surge up and down with engine RPM. The result: No low coolant warning light. Light Mini Bulb How to Replace tail lights and bulbs Jeep Grand Cherokee 2011. I decided to run some tests and I took the car out this morning with the engine completely cold (it had been sitting overnight) but did NOT turn on the heat. stays on and doesn t blink Rear Tail Stop Turn. ![]() I checked the coolant levels several times, once when the engine was fairly-warm and once when the engine was cold and the results were the same, coolant levels were normal. Very recently I had a problem with the car overheating and replaced the fan clutch (failed the newspaper test) and fan sensor (electric fan came. UUC SSK, clutch job eventually, Wavetrac LSD. DIY On deck: Rear Diff and carrier bushings. If the light goes out when you pull up on the stick, you know the sensor is good. And yet the low coolant warning flickered on and off all day long. For almost a year the radiator dash/indicator light on my 2002 BMW 325i would light, stay on a while and then disappear. Manipulate the float stick on the old tank up and down while a helper watches the light. On my drives around town Saturday I monitored engine temps carefully and they never exceeded the midpoint on the temp gauge. Anyways about halfway to Starbucks the light came on, however, just as I was pulling into Starbucks it went out. As I don't have an ice scraper I left the car running with the defroster on full and the heat at 80 degrees for about 10 minutes before my Starbucks run. If the coolant light comes on and you find out the coolant is still full, it means the coolant sensor might be bad. This was the first time I had actually powered up the heater to full since owning the car. ![]() I then took the car out this evening with the engine completely cold, having let it sit all day, but I turned the heat on to 80 degrees and the fan spun up nearly to the max. The high resistance fault means that the electrical resistance in the ignitor is too high. The result: No low coolant warning light. The seat belt tensioners gave a small explosive (yup) charge that are designed to take up all slack in the case of a frontal impact. After the first frost, on my drive down to Starbucks the low coolant warning light came on. No, your airbags won’t go off erroneously. Its starting to get cold here in Memphis, we got our first frost a couple of days ago.
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