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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 10-19-2008, 10:35 AM   #1
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Need Some Help.... Please

Alright, so my car threw the CEL for my thermostat and coolant level, I repaced the thermostat and refilled the coolant, so that should have been that. However, right when all this was happening, my heat started to not work. Yesterday, I opened up the bleeder screw and 'bled' the cooling system, thinking there might be some air bubbles, there was, I watched them come out, then sealed the screw up and went on my merry way. For about 6 hours, my heat was working good, however, later on in the night, when it was actually cold... nothing. I am hearing this 'squealing' sounds too whenever I accelerate or rev around 2,100-4,000 RPMS. I am wondering if there is a leak of air into the cooling system that I will have to continually bleed in order to work or what might be going on. My car doesn't overheat at all and stays normally right around the noon mark on the temp gauge. Any and ALL help would be appreciated.
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Old 10-19-2008, 11:11 AM   #2
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Sounds like you might need a new water pump. Try bleeding the system again though, if there is air in there it might have caused a pocket again and that's the problem. Check over all of your pulleys too.
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Old 10-19-2008, 02:32 PM   #3
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Originally Posted by willsbma View Post
Sounds like you might need a new water pump. Try bleeding the system again though, if there is air in there it might have caused a pocket again and that's the problem. Check over all of your pulleys too.
He is correct you have an air pocket in the system. It also may be a fauly pump do your hoses get hard and can you see a flow of coolent in your expansion tank

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bleed, cel, coolant, heat, thermostat

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