325i heating up, removed t-stat still heating up.. Please read!! - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 02-04-2011, 05:58 PM
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325i heating up, removed t-stat still heating up.. Please read!!

Ok so I removed the t-stat (I live in az) and the car still heats up, so I did realize right now that the passenger side of the radiator is cold and driver side is hot, does that mean anything? Also after heating up I loosened up the radiator cap and the water that came out was cold.. What's going on? Any idea? Thanks guys
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#2 (permalink) Old 02-06-2011, 12:54 AM
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Originally Posted by azmattaz06 View Post
Ok so I removed the t-stat (I live in az) and the car still heats up, so I did realize right now that the passenger side of the radiator is cold and driver side is hot, does that mean anything? Also after heating up I loosened up the radiator cap and the water that came out was cold.. What's going on? Any idea? Thanks guys

well i have not much experience but i sounds like a clogged radiator or coolant line remember that the expancion tank connects to the heater not directly, so i would think maybe check radiator, water pump or the hoses that my opinion. sorry for not having a solving answer
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#3 (permalink) Old 02-06-2011, 04:53 AM
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Check the line that joins the expansion tank to the radiator, if its kinked it can prevent any air trapped in the system from being purged to the expansion tank.

Also some water pumps have a plastic impellor which can come loose from the shaft when hot and reattach when cold. It makes for a bastard of a problem to isolate unless you can get the water pump off quick enough when the engine is hot. Is the water pump housing getting hot, or is it staying cold as well?


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#4 (permalink) Old 02-07-2011, 01:04 PM
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At this point, I would definitely take look at that water pump........seems like there is no coolant circulation!


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