First, the light came on indicating low coolant level. I bought BMW antifreeze, mixed 50/50, and filled to correct level (2-01-09). Car ran fine 2-2-09, and on 2-3-09, my wife called and said the car smelled like it was hot. Temperature gauge was in the middle, but I had her pull over and sit. I picked her up and did notice the hot smell, decided it was best to leave the car and get it in the morning. The next morning, after sitting all night outside in 20 degree temps, I started the car and immediately smelled the same thing. Drove the car and the temp gauge was in the blue, then jumped over to red, then immediately back to blue. I did notice that when sitting in traffic, the car would start to creep towards the middle on the temp gauge, but if I was moving, it would come back to the blue range. After a little while on the road, I realized that the heat in the car was not getting hot, just mildly warm, and that was with it set at 91 degrees and full fan. I have parked the car since, but was wondering if anyone had any suggestions on what to do from here. I did not bleed the coolant lines, because I could not find a place to do so.
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Re: BMW 325i (2001) overheating?
Hi there, you are experiencing a water pump failure. this may be in conjunction with a faulty thermostat as well. i wouldn't drive this car until you replace the water pump and thermostat. it will only cause more internal damage. hope that helps and, thx for using fix ya:)
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The first thing to check is the level of coolant-is it full? Because no heat is the first indication of low coolant. When car is cool, open radiator cap and fill with a 50-50 mix of antifreeze and water. Also fill the overflow tank halfway up with the coolant mix.
Also feel both heater hoses after the car has come to normal operating temperature. Both should be hot. If they are, the heater is working as intended. If only one is hot, the coolant is not circulating through the heater, and someone will have to get that working-possibly an air block in the heater core, possibly a plugged heater core.
Finally, the blower motor may have wore out. Without the blower, very little heat will come out. Test or replace the blower motor.
Either your coolant is low or the coolant level sensor is bad. You should see the overflow resevroir next to the radiator under the hood. Open the cap when the engine is cool and fill with a 50/50 mix of antifreeze to the cold level. If you are already at the level, you will see a sensor mounted on the bottom of that tank. Can probably get it through autozone or definately through Pelican Parts. Easy change..
The coolant type is not the issue but It seems there is a LOW LEVEL OF the COOLANT. Allow the engine to cool down and check the coolant level in the overflow/reservoir tank. If low you need to top up the coolant in the tank. Also check the pressure cap of the radiator, replace if there is low level of coolant in the radiator.
However if the coolant looks murky or rusty then it is best to flush out the coolant and refill with the specified type.
On the 4 cylinder you will need 1 1/4 gallons of antifreeze mixed with an equal amount of distilled water for a 50/50 mix. On the V6 you will need 1 5/8 gallons of antifreeze mixed with an equal amount of distilled water for a 50/50 mix. Make sure and use the correct type antifreeze.
first find the leak and repair it. second, make sure it does not overheat again or you may also need a thermostat. Your heater will not work when coolant level drops below a certain level. since it's leaking, likely that level has been reached. After repair has been made, re-fill with 50/50 antifreeze mix, with the engine running and heater on full heat to allow air in system to escape. If while filling it begins to overheat and keeps spitting out coolant, replace the thermostat.
No heat is often a symptom of low coolant, usually followed by overheat. There are other controls that regulate heater, but right now, re-fill the cooling system with engine running and heater on high, then check for leaks (coolant you lost went somewhere...you need to determine where) Low coolant will damage your engine. Take care of that first, then if heater still does not work, then do diagnosis on that. (if you loose the engine heat won't matter, will it!)