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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Jul-10-2018, 08:16:28 AM   #21
Saimon69
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Default Re: 2003 M3 overheating THE WEIRDEST THING

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Originally Posted by bigjae1976 View Post
It was probably your post I was thinking of. Saw that about a week after I ordered mine! Lol.

Iíve deleted the AC, aux fan, and heater core. I have a SPAL fan as well. Wonder if that makes a difference.

Either way, donít see a reason to stray from OE in hind sight. Itís a better design than the non-and which mounts the expansion take with hot coolant against the radiator.


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so i'm thinking on going that route my self.
do you care sharing your set-up?
size of fan? model? what activating it and at what temp?
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Old Tue, Jul-10-2018, 08:37:05 AM   #22
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Default Re: 2003 M3 overheating THE WEIRDEST THING

Im having the same F'ing problem for the last year! Just installed a new Clutch fan and it helped a bit but again in traffic with AC on in 110f-125f temps the car goes to 3/4 temp and only goes back to half when driving. This is ONLY with the AC on. I will double check the Aux Fan on the car but ive never faced this issue in 10 years....FML!
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Old Tue, Jul-10-2018, 11:59:48 AM   #23
bigjae1976
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Default 2003 M3 overheating THE WEIRDEST THING

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Originally Posted by Saimon69 View Post
so i'm thinking on going that route my self.

do you care sharing your set-up?

size of fan? model? what activating it and at what temp?

On track with 110-120 degree surface temps, oil temps are still an issue but coolant temps were excellent - 208 has been my peak temp.

I have a CSF radiator and an aluminum expansion tank mounted in the drug bin. Iíve plugged the heater core loop which I think also helps. Iíve deleted the AC. I think the expansion tank relocation has helped the most. Itís located right above the headers.

My fan is a straight blade 16Ē SPAL fan connected to a dual position switch so I can turn it on with ignition or when the car is switched off. I might change it to a temp switch in the lower road hose but I havenít found one that activates below 160 deg F. I leave mine on with ignition and then switch it on in the paddock as needed. Let it run for a couple of minutes, start the car, turn off the car and let the fan run some more.

One other thing...does everyone have the heat shields over the headers? That might be the only thing my setup can contribute to everyone. There isnít much airflow through there and Iíd guess that when idling, the headers are heatsoaking the expansion tank. I see quite a few cars that donít have the heat shields so I guess itís not uncommon to delete them.

I probably should put a covering on the hose that runs to the water pump over the heat shield.




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Last edited by bigjae1976; Tue, Jul-10-2018 at 12:19:37 PM.
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Old Tue, Jul-10-2018, 02:22:43 PM   #24
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Default Re: 2003 M3 overheating THE WEIRDEST THING

Taking into account what you've already replaced, and the fact that its overheating at speed makes me suspect it's the oil cooler.
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Old Tue, Jul-10-2018, 05:31:29 PM   #25
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Default Re: 2003 M3 overheating THE WEIRDEST THING

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Originally Posted by Saimon69 View Post
the mechanical one can "move" a lot of cubics feet of air apparently (from what i could see it's 2300) but as a mechanical fan, it needs the engine to speed up high - so high revs and i and a lot of other m3 owners experiencing the problems in low speeds/sitting in traffic/idling when the mec fan cannot speed as fast and therefore cannot use it's potential to full.
That’s not how the mechanical fan works. The idea is to give you airflow at idle to low engine speeds and then to declutch in higher revs (where road speed and forced airflow take over). Why do you think it is a clutched fan and not a solid mount?! This eliminates parasitic drag for engine performance and also keeps the centrifugal force low on the fan so it doesn’t blow apart at 8200rpm. It’s whole potential seen IS at idle, when hot, and when in good working order.

Last edited by Braymond141; Tue, Jul-10-2018 at 06:42:38 PM.
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Old Wed, Jul-11-2018, 03:32:47 AM   #26
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Default Re: 2003 M3 overheating THE WEIRDEST THING

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Taking into account what you've already replaced, and the fact that its overheating at speed makes me suspect it's the oil cooler.
Even on very hard driving, on the hottest day and even when ac is on, oil temp does not get to even the center 210.

Last edited by Saimon69; Wed, Jul-11-2018 at 03:36:45 AM.
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Old Wed, Jul-11-2018, 03:39:52 AM   #27
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Default Re: 2003 M3 overheating THE WEIRDEST THING

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Originally Posted by Braymond141 View Post
That’s not how the mechanical fan works. The idea is to give you airflow at idle to low engine speeds and then to declutch in higher revs (where road speed and forced airflow take over). Why do you think it is a clutched fan and not a solid mount?! This eliminates parasitic drag for engine performance and also keeps the centrifugal force low on the fan so it doesn’t blow apart at 8200rpm. It’s whole potential seen IS at idle, when hot, and when in good working order.
I'm sorry but I don't think I understood. If the mec fan can only work at the speed that the engine is turning, and (as I already knew) the clutch if to only allow slip on very high engine speeds, how can the clutch fan have any advantages or capabilities when idling?

Last edited by Saimon69; Wed, Jul-11-2018 at 03:53:52 AM.
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Old Wed, Jul-11-2018, 03:50:09 AM   #28
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Default Re: 2003 M3 overheating THE WEIRDEST THING

Took the car back to the mechanic today. On the way there, going 70mph, ac set to 69f at the lowest fan speed and ambient temperature 93f,car passes the center again and immediately went back.
Talking it through with the mechanic lead us to believe the problem is air flow since I took care in full at the water flow so we're thinking maybe the AC condenser is clogged up really bad to prevent air flow because in 70 miles an hour there is so much air flow coming that even people with fan delete on track don't experience heat building up like that at speeds.

Also thinking of replacing the auxiliary fan inside the OEM shroud with a stronger, possibly spal unit. the thing is I can't find the specs of the OEM axillary fan as far as how much cfm it can blow so I can go higher. Does anyone have that information handy?
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Old Wed, Jul-11-2018, 03:55:42 AM   #29
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Default Re: 2003 M3 overheating THE WEIRDEST THING

Man that is a one sexy expansion tank. Really looks like a piece of art.
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Old Wed, Jul-11-2018, 03:06:05 PM   #30
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Default Re: 2003 M3 overheating THE WEIRDEST THING

Quote:
Originally Posted by Saimon69 View Post
Took the car back to the mechanic today. On the way there, going 70mph, ac set to 69f at the lowest fan speed and ambient temperature 93f,car passes the center again and immediately went back.
Talking it through with the mechanic lead us to believe the problem is air flow since I took care in full at the water flow so we're thinking maybe the AC condenser is clogged up really bad to prevent air flow because in 70 miles an hour there is so much air flow coming that even people with fan delete on track don't experience heat building up like that at speeds.

Also thinking of replacing the auxiliary fan inside the OEM shroud with a stronger, possibly spal unit. the thing is I can't find the specs of the OEM axillary fan as far as how much cfm it can blow so I can go higher. Does anyone have that information handy?

It sounds like youíre throwing parts at the car. We all do it but it gets expensive.

I think replacing the condenser is a good idea if itís beat up. Not sure I would change the aux fan though.

You say the temp goes up and comes back down. What causes it the temp gauge to go back to center? Again, Iíd be curious to see what the actual water temp is.
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Discussing 2003 M3 overheating THE WEIRDEST THING in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)