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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 08-10-2012, 09:12 PM   #1
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My Ride: 330ci 2001
coolant leak?

i am suspecting a leak because dipstick is reading low but no low coolant light. also when i put some more coolant in the next few days it will go back to reading low (dipstick) but i do not see any coolant on the ground or leakage anywhere around the car. is this a normal thing to lose a bit of coolant during the summer? also the amount of coolant that i add is a very small amount about a 3/4 of a cup.

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Old 08-10-2012, 09:13 PM   #2
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Maybe your coolant tank cracked. That happened to me, and the thermostat was toast. But then again, my driveway was flooded with coolant :O
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Old 08-10-2012, 09:15 PM   #3
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yea i see no sign of coolant on the floor, Idk maybe i'm its fine but i just want to be safe.

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Old 08-10-2012, 09:58 PM   #4
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Check the sensor in the lower radiator hose, the O-rings leak all the time.

If there is any moisture under the switch onto of the belly pan, your O-ring needs to be replaced.

See my signature below for the O-ring part number.
Solve your misfires, lean codes, rough idle -

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Hidden OBC Menu - Check Voltage, Temp, Fuel Level -

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Lower hose temp switch O-ring - BMW #13621743299
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