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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 Sun, Jul-16-2017, 11:03:43 PM   #21
silvergray545
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Default Re: Overheating water temp at high rpm.

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Originally Posted by IRM3 View Post
Solved the overheating issue. It turned out to be bad fan clutch. I didn't think to check since it was replaced less than two months ago. The fan clutch was Behr/Hella brand, not expensive OEM unit. I'm very surprised at how quickly it fails.
Did you confirm this on track?
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Old Mon, Jul-17-2017, 12:27:22 AM   #22
speeeding
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Default Re: Overheating water temp at high rpm.

Quote:
Originally Posted by IRM3 View Post
Solved the overheating issue. It turned out to be bad fan clutch. I didn't think to check since it was replaced less than two months ago. The fan clutch was Behr/Hella brand, not expensive OEM unit. I'm very surprised at how quickly it fails.
Was this definitely the problem? I put in a new Sachs fan clutch, but that didn't solve the issue for me.
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Old Mon, Jul-17-2017, 03:42:03 AM   #23
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Default Re: Overheating water temp at high rpm.

I did not confirm this on track, but I went driving in 115 degree weather before and after swapping in the working fan clutch. With the broken fan clutch I was seeing dramatic increase in water temp right away. I was doing my best to keep the RPM high and on full throttle to simulate track condition as close as I can. After the swap, my water temp needle stayed high noon and didn't deviate. I connect Bluetooth OBDII to read water temp directly from the sensors and it stayed around 200 degrees on hard driving in the desert for 20mins. I suggest to you double check your fan clutch even if it's new. Easy way to do that is to run ur car until hot, pop the hood and check resistance of the fan at idle. You shouldn't be able to stop or slow the fan down. I'm seeing oil temp around 230-240 so I'm planning on replacing my stock cooler with CSF one and eliminate any worries on track.

Also, I performed Block Tester test on the coolant and I had no sign of leaking head gasket. I will report back after my next track day.

Last edited by IRM3; Mon, Jul-17-2017 at 03:49:28 AM.
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Old Mon, Jul-17-2017, 03:48:19 AM   #24
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Default Re: Overheating water temp at high rpm.

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Originally Posted by speeeding View Post
Was this definitely the problem? I put in a new Sachs fan clutch, but that didn't solve the issue for me.
This was definitely the issue for me. You should perform a quick check to make sure your new unit didn't fail prematurely like mine did. Although, I hear Sach fan clutch is better quality than most brands. Also, you might try checking your thermostat and water pump. Mine was in great shape.
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Old Mon, Jul-17-2017, 04:14:38 AM   #25
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Default Re: Overheating water temp at high rpm.

I'm surprised the fan clutch makes that big of a difference at high speed. I'll check mine tomorrow.
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B&B TriFlow Section 3 | AP V2 headers | TMS Power Pulleys | aFe Drop In Dry Filter | Macht Schnell Intake Elbow | TTFS Tune | CSF Radiator & Oil Cooler | AST 4200 Coilovers | Ground Control Race Camber Plates & RSMs | TMS Rear Camber Arms | Hotchkis Front Sway Bar | Stoptech ST40 Front & Rear BBK | UUC EVO3 SSK with DSSR | ZHP knob | Orion V4 | Matte Black Kidney/Side Grills | 35% Tint | Apex 75mm Wheel Studs | H&R Trak+ 10mm Spacers | 19" VMR CSL reps | 245/35 & 275/30 Continental ExtremeContact DW
Track Stuff: Apex ARC-8s in 18x10 ET25 | 275/35/18 Nitto NT01s | Schroth Quick Fits | PFC 08s

2000 BMW M Roadster 5MT - TiAg/Black
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Old Mon, Jul-17-2017, 06:03:16 PM   #26
speeeding
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Default Re: Overheating water temp at high rpm.

Quote:
Originally Posted by IRM3 View Post
This was definitely the issue for me. You should perform a quick check to make sure your new unit didn't fail prematurely like mine did. Although, I hear Sach fan clutch is better quality than most brands. Also, you might try checking your thermostat and water pump. Mine was in great shape.
The new Sachs unit I put in works well, but my coolant was still getting hot at Thill. I'm going to replace the thermostat next. If that doesn't work, then I'll look into the radiator.
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Old Mon, Jul-17-2017, 08:29:35 PM   #27
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Default Re: Overheating water temp at high rpm.

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Originally Posted by speeeding View Post
The new Sachs unit I put in works well, but my coolant was still getting hot at Thill. I'm going to replace the thermostat next. If that doesn't work, then I'll look into the radiator.
I would say if it doesn't overheat on normal drives in heat, then I might not be thermostat. What mixture are you using in your coolant?
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Old Mon, Jul-17-2017, 08:55:13 PM   #28
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Default Re: Overheating water temp at high rpm.

Quote:
Originally Posted by IRM3 View Post
Solved the overheating issue. It turned out to be bad fan clutch. I didn't think to check since it was replaced less than two months ago. The fan clutch was Behr/Hella brand, not expensive OEM unit. I'm very surprised at how quickly it fails.
I thought Behr is the OEM? At least my fan clutch, IIRC, had the Behr logo on it, in addition to the BMW original sticker/placard thing.
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Old Tue, Jul-18-2017, 12:09:50 AM   #29
speeeding
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Default Re: Overheating water temp at high rpm.

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Originally Posted by IRM3 View Post
I would say if it doesn't overheat on normal drives in heat, then I might not be thermostat. What mixture are you using in your coolant?
I'm using 50/50 with Water Wetter. I'm thinking about replacing both the radiator and thermostat now. Did you flush out your radiator too?
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Old Tue, Jul-18-2017, 07:03:10 PM   #30
IRM3
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Default Re: Overheating water temp at high rpm.

I use water and water wetter only, no coolant. I flushed my system reguarly. Get a a clean container to catch the fluid and inspect for oil or residue.
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Discussing Overheating water temp at high rpm. 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)