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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 04-11-2012, 12:32 AM   #1
MattEM3
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Cool Help me find my coolant leak...

I have an 03' M3 SMG transmission

I first noticed the leak after a trip of "spirited" driving. Originally, it looked as if the upper radiator hose was dripping coolant, I replaced the hose and still the leak persisted. Turns out that the coolant was seeping onto the belts and pulleys and shooting up onto the upper hose and dripping down from there

Something I noticed after doing some personal research that probably is relevant (but I don't want it to be) is that the radiator fan, connected to the water pump (obviously) is loose and a noise comes from the front of the car (most audibly at start up)

My question is, is there any where else that this leak can be coming from besides the water pump? Because I really don't want to spend $500 if I don't have to...

and if I do, does anybody have a DIY step by step for replacing the water pump?

Thanks guys
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Old 04-11-2012, 10:35 PM   #2
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Nobody has anything to say about this?
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Old 04-11-2012, 10:46 PM   #3
bimmerfan08
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Its most likely your water pump. I had the same issue. Heres my DIY. Its meant to be an easy to read and follow along guide.

http://forum.e46fanatics.com/showthr...735&highlight=
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Old 04-12-2012, 01:18 AM   #4
llcoolj0n
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Bimmerfan08's DIY should answer your issue. Water pump, thermostat housing seal, or that pipe seal. That should be about it. Goodluck
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Old 04-12-2012, 01:25 AM   #5
MattEM3
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Damn, I was hoping to not have to do it
But looks like I have little opinions left...

Should I replace the belts while I'm in there too?
and maybe even the fan?
Because I heard that even small chips off the blade can throw off the rotation of the water pump shaft and mess up the bearing
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Old 04-12-2012, 02:06 AM   #6
llcoolj0n
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I'd do the belts too. As far as the fan, they won't be chipping unless they are grinding/hitting something. If the fan looks ok, leave it alone.
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Old 04-12-2012, 07:49 AM   #7
Ky///m3
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id do a sport fan clutch while u r in there too.....easy and cheap

so to do list:

water pump
belts
sport fan clutch



how many miles are on your car?
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Old 04-12-2012, 12:00 PM   #8
MattEM3
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My fan doesn't have any chuncks off of it
But it looks like it was scraping against the fan shroud
Nothing too serious

What are the advantages of the sport fan clutch?

It has 118k on it
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Old 04-12-2012, 01:36 PM   #9
roadtrip1098
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Another thing to check is the coolant temp sensor bung on the lower radiator hose, it doesn't take much for those to wiggle loose. I'd recommend keeping a jug of coolant with you though because when the water pump decides to go there isn't much warning and it'll spew all of the coolant out fairly quickly.
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Old 04-12-2012, 04:23 PM   #10
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Yeahh... I've heard about the infamous O-rings for just about everything in this car

and I do
Im trying not to move her too much though while I wait for parts
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Old 04-12-2012, 04:33 PM   #11
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If the wp blows apart, you have bigger issues than just being low on coolant.

Wobbly wp probably does mean the wp, but use an inspection mirror and good led flashlight to confirm this. Also, just because you find one leak, doesn't mean you only have one. Clean things off with water...spritzer bottle works good...and look for fresh signs of coolant.

Yes, this is a great time to do belts and all three pulleys...not sure what tensioners you have, but you can plug your PN into Dayco's website, get the dayco pulley number and order them from autozone or advanced...they're OE, believe it or not!

The temp sensor, if leaking, can be fixed with the IAT o-ring--I think jfoj has that PN in his sig and I assume it's the same part as on a non-M...confirm PNs at realoem.com

HTH
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Old 04-13-2012, 04:17 PM   #12
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Take the fan off and then the water pump pulley that is held on by 4 bolts. Under the WP shaft there is a plug/ weep hole on the WP that leaks. When you take off that pulley it will will full of blue gunk from the leaking WP. Sure fire way to know for sure it is the WP. However, with your mileage, the WP is suspect.

Last edited by MBW; 04-13-2012 at 04:19 PM.
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Old 04-13-2012, 09:18 PM   #13
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Does the TMS power pulley kit go on the same way the OEM belts do?
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Old 04-15-2012, 12:44 PM   #14
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I'm really surprised no one has yet gave the sugestion of renting a cooling system pressure tester. I would be looking for one of these. Hook it up. Pump it up to 16-18 psi and watch to see where the coolant drips from. Hate to see you buy and install a part and turn out not fix the original cocern

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Old 04-16-2012, 12:26 AM   #15
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Just did that the other day
A friend of mine just opened up a shop and hooked it up for me so that was cool
It was the pump though, just waiting on parts now
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Old 04-16-2012, 01:51 AM   #16
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Originally Posted by MattEM3 View Post
Just did that the other day
A friend of mine just opened up a shop and hooked it up for me so that was cool
It was the pump though, just waiting on parts now
Good to hear you got the problem fixed
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