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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 01-08-2015, 09:02 PM   #1
Littlenikki
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My car is overheating!! Anyone help?

So my 330xi 2001 bmw didn't respond to the cold weather New York has been having lately very well. Woke up this morning started it up and the heat didn't work. Next, get to my destination and my car overheats, and spills out all liquid from radiator. So I waited till it cooled, filled it with water to get her home. Filled my radiator with coolant and test drove it. Heat still didn't work but my car didn't overheat for a good 15 miles. Eventually it did and spewed hot coolant all over again. I'll take it to the shop tomorrow but kind of want a good idea of what's going on. Any input would help. Thanks!!
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Old 01-08-2015, 09:33 PM   #2
brichter
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How far from home to your destination?
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Old 01-09-2015, 09:36 AM   #3
DSilk56
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Sounds like your water pump may be shot. A non-functioning pump would explain both the overheating and the lack of hot coolant passing through the heater core.
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Old 01-09-2015, 09:39 AM   #4
dillard
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Thermostat
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Proud owner of '04 M3 Convertible:
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Old 01-09-2015, 09:50 AM   #5
Littlenikki
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It was only like 2 miles from the spot it first overheated, then when I test drove it, I drove for like 10 miles. Didn't overheat till I almost got home. I thought maybe the thermostat but one morning a few days prior the heat didn't work, I worked my 8 hour shift and when I started it to go home, my heat worked.
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Old 01-09-2015, 10:52 AM   #6
chanman1029
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The thermostat may be getting stuck closed, i replaced my thermostat and fan clutch yesterday, i also had no heat while those were messed up, but as far as the leak, you'll just have to see exactly where its coming from and replace that part itself
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Old 01-09-2015, 10:56 AM   #7
Littlenikki
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Like the hose? And or my actual radiator? It seems to be leaning out the right side. That's where the water spews out when it over heats
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Old 01-09-2015, 10:57 AM   #8
Littlenikki
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Thank you guys so much! Has been a big help. I'm going to the garage now so I'll update when I know the problem.
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Old 01-09-2015, 11:00 AM   #9
chanman1029
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From my personal experience a few months ago, there would be times when my coolant level was normal, than all of a sudden it would leak half of it out, just barley leaving enough to operate without overheating, this was caused by a leak in the expansion tank. You cant tell if its the expansion tank if it leaks down to a certain amount and then stops leaking. But for your situation, you will have to look at the individual hoses, expansion tank and the radiator itself to find the leak
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Old 01-09-2015, 11:01 AM   #10
chanman1029
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I would really recommend repairing it yourself, it may seem overwhelming but once you get your hands dirty its not really that difficult, but i understand of you want a professional to tale of the problem
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Old 01-09-2015, 11:02 AM   #11
Littlenikki
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You think cause I just had water in my radiator and since we've been having really cold weather it froze then cracked?? That's my logical guess I'm not very car savvy but I have common sense..
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Old 01-09-2015, 11:03 AM   #12
chanman1029
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Thats possible, but ive never put water in it so i could'nt give you an answer
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Old 01-09-2015, 11:04 AM   #13
Littlenikki
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Okay well thank you!
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Old 01-09-2015, 11:06 AM   #14
chanman1029
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Just let us know what the shop tells you before you make the decision to let them repair it, would'nt want them taking advantage of you
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Old 01-09-2015, 06:09 PM   #15
Littlenikki
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My mechanic says the radiator was leaking by the hose, and they fixed it. He just wants to make sure the water pump is working well too. Thanks again for all your help!
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Old 01-09-2015, 06:16 PM   #16
chanman1029
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Did he replace the radiator or the hose, and which hose what it?
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Old 01-09-2015, 08:19 PM   #17
Littlenikki
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The hose wasn't leaking it was my radiator by the hose I didn't ask which one.. But he kept it overnight to check water pump.
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Old 01-09-2015, 08:23 PM   #18
chanman1029
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Oh ok, hopefully that'll still work
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Old 01-14-2015, 05:09 PM   #19
Littlenikki
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Update: my 330xi still overheating

So I posted something about a week ago, brought her in and my mechanic fixed my leak, I just replaced my thermostat, and she's still over heating! I don't know what else to do. And as far as I'm concerned neither does my mechanic
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Old 01-14-2015, 05:57 PM   #20
Mario0617
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Honestly, I would Replace the expansion tank, thermostat, and Water Pump, at the minimum. If your cooling system has never been overhauled before, you should do so. Your system might also need to be bled if your mechanic isn't very good and didn't do so.

This is a guide on the cooling system. It includes part #s, lists, etc. It won't diagnose your problem, but it will help you gain some knowledge about the system, especially if you decide to overhaul it. (If it is financially possible to do so, I ABSOLUTELY WOULD)

http://forum.e46fanatics.com/showthread.php?t=914109

And this is a guide on how to bleed your cooling system. Do so only with BMW coolant mixed 50/50 w/ distilled water.



Hopefully these help you out. Please be careful not to overheat your engine. The second you see that gauge move, kill the engine and pull over. These engines are sensitive to overheat.
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