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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 10-07-2009, 04:15 PM   #21
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The radiator fan is my problem...I just received the fan and don't want to mess something up...
My car is auto btw
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Old 10-07-2009, 04:48 PM   #22
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The fan is pretty easy to take out. If you're looking at the front of the engine, there is a screw on the backside of the radiator fan shroud on the top left that needs to be removed. Then on the right side, there is a small plastic rivet that you need to remove as well. After those are out, unplug the connector from the top left side of the radiator fan shroud and life the fan shroud straight up and out.

Thats it!
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Old 01-20-2012, 02:57 PM   #23
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@D I'm dealing with the same problem now, follow your steps fan is engaging now. So I'm wondering if payed for a new fan for no reason? what if I don't have to replace the fan I just need to do the bleeding properly? What do you think? It's $400 bucks I can use for something els!!!!
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Old 01-20-2012, 11:46 PM   #24
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your head gasket maybe gone or the head warp n air is getting into the system ! it the hoses hard the minute u turn the car on ? look into it
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Old 07-03-2012, 09:31 PM   #25
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Originally Posted by Daemonix View Post
Greetings all! Update here!

I fixed it!
Here's what happened:

I replaced the thermostat and filled the system back up with coolant/distilled water. Turned the car on and it still overheated.

Went back to the boards and read some more about how to "bleed" the cooling system. It turns out that if the heater isn't blowing hot air after you turn the car on, that there is air trapped in the system, and that I didn't bleed the cooling system properly.

I decided to go against taking the coolant plug out from the passengers side exhaust manifold area. That left one bleeder screw, 2 inches to the right of the main coolant fill hole in the top of the radiator reservoir.

I looked at the coolent level, which was full to the brim, and then loosened that screw. Within seconds, the level dropped down with a noticeable air purge coming out of the bleeder screw hole.

I then poured a good gallon or so of distilled water and coolant (50/50) into the resevoir until it filled it.

Turned on the car and squeezed the upper and radiator hoses and few times to push out air. I then replaced the bleeder screw and put the radiator cap on.

This time, the upper radiator hose got super hot which meant that the water was indeed travelling through the block and into that hose... unlike before. This is a good thing.

Within about 10 minutes of idle, my fan came on as noticeable heat was now coming off of the engine.

Took the car for a test drive and had no further issues with the cooling system. After letting it sit overnight from it's run, I refilled the resevoir another 1/4 gallon or so (from air moving out of the system) and capped it back up.

No further issues whatsoever.

Turns out the 10 step instructions for bleeding your cooling system is actually important. It's not like filling up an old truck radiator...
Just wondering where i can find the 10 step bleeding instructions?
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Old 07-03-2012, 09:32 PM   #26
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Hi where do i find this 10 step bleeding guide? Cheers
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Old 03-24-2014, 04:20 PM   #27
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consensus is to bleed the system properly and replace thermostat and sensor on lower radiator hose? I had the dealership replace all my fluids and thermostat after my coolant expansion tank blew in traffic. Overheating problem still occurred in traffic when sitting or slow progress (summer). Recently, fan was checked in a shop and had power and grounded. They want to do a wire trace to see if a relay or switch is bad. I think I have a slow leak in coolant somewhere but can't pin it down. They pressure checked the system recently and didn't find anything so it's unknown where this leak is. Should I have them re-bleed the coolant and replace the sensors before I authorize the wire trace?
99 328i E46 Manual Trans
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Old 02-18-2017, 10:04 PM   #28
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mine is doin the same thing

Originally Posted by superfestiva View Post
How hard was it to change the radiator fan? Mine is doing the same but only when the a/c is on...
mine is overheating as soon as in turn the ac on.
I have the standard transmission so I only have the one electric fan. and it only come on when the ac is on.
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coolant, fan, overheating, radiator, switch

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