![]() ![]() seems I've read they start to show problems around 100K miles and then one problems leads to another-constantly chasing down micro-leaks. IMO-the Coolant systems "suck" (poor design) on the e-46. ![]() This smoke can be a sign of coolant burning in the engine. White exhaust smoke: A coolant leak can cause white smoke to emit from the vehicle’s exhaust pipe. angry at myself for not DIY on that one cause its easy to replace fan on the manual tranny e46 with parts on line at about $80Ĭonstantly chasing micro-leaks in the system, topping off coolant, replacing temp sensors, replaced thermocouple/thermostat, almost all coolant sensors on coolant lines and system, Increased engine noise: When the engine doesn’t have enough coolant, it can make a rattling or grinding noise due to increased friction and wear. The bottle crack was a symptom of The fan motor not operating at idle-thus the system would get too hot if I did not drive it but left the car idle for 15 to 20 mins. Typically the sensor, which monitors the coolant temperature, knows how to adjust to varying temperatures depending up the status of your car running, warming up, or cold. If the lower hose is cold, then you arent getting proper coolant flow, likely due to low fluid, a stuck thermostat, or bad water pump. Your coolant light will come on when the sensor senses an incorrect change in the temperature in your system. They should both be hot (upper will be hotter). I replaced it myself, some of the hose connection / reconnection were a bittch to remove and replace, suggest replacing all connecting hoses when changing reservoir bottle. You can check for proper coolant flow by letting the car warm up and touching the top and bottom radiator hoses (CAREFULLY). Hi temp Glass filled Nylon-(under designed imo) A blue engine coolant temperature light only indicates one thing: that your coolant, or antifreeze, is too cold. If the level is accurate, the following are the culprits. I suppose it is also important to find out why coolant has disappeared. In this case, the first thing you will need to do is, check the coolant level. I guess this would dillute the water:coolant ratio from 50:50 to something like 60:40. This is a common problem, can only see it "weeping" when engine is hot and crack on the bottle is under pressure from boiling coolant, the bottle is supposedly HT PA66 GF. What are the Reasons Low Coolant Light Comes On and Off Several reasons are responsible for the low coolant light turned on and off the problem. I have had so many coolant system issues on my E46 Manual trans 2000 323i (108K miles)ġst was a hairline crack in the reservoir fill bottle, the crack was on the left front radius corner looking down from the top (direction of crack was top to bottom) was about 3/4" long.
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