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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 Sat, Jul-15-2017, 06:34:58 AM   #1
IRM3
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Default Overheating water temp at high rpm.

Hi guys,
I'm here to ask for some advice on what could be the culprit of the overheating issue I have. I was up at Thunderhill for the track day last weekend and experienced water temp exceeding the 3/4 mark when I'm on high RPM. The oil temp is close to 3/4 mark but never above. The water temp creeps back down to normal once I backed off and short shifted. The temperature is RPM dependent. Today I removed thermostat and water pump for inspection and everything is working as they should. I left the thermostat out and went for a drive. Same issue at high RPM. Note, I did a few pulls to redline when oil temp is normal and water temp didnt move, but once the oil temp is getting high, the water temp start creeping up pass 3/4 mark. I'm going to do an exhaust gas leak on coolant to rule out blown head gasket. Btw, I'm running water and water wetter mix, no coolant.

Could oil cooler also be the culprit? I'm contemplating upgrading to CSF oil cooler, but I don't want to throw money at the problem. Anyone have experienced the same symptoms?

Thanks in advance.

Last edited by IRM3; Sat, Jul-15-2017 at 06:40:18 AM.
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Old Sat, Jul-15-2017, 07:01:34 AM   #2
silvergray545
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Default Re: Overheating water temp at high rpm.

I'm literally having the same exact problem. Check out my thread in the track subforum.

http://www.m3forum.net/m3forum/showthread.php?t=589640

I have a track event next weekend. I bled the cooling system again, will add water wetter and have my CSF oil cooler installed. Fingers crossed, this fixes the issue.
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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
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Old Sat, Jul-15-2017, 11:15:22 AM   #3
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Default Re: Overheating water temp at high rpm.

if you guys do a leakdown test, please post results to add to the collective knowledge. Most people are thinking if the pump is ok and the radiator is properly bled that there is most likely a HG leak. It will be good to confirm or rule out HG.
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Old Sat, Jul-15-2017, 02:57:23 PM   #4
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Default Re: Overheating water temp at high rpm.

Quote:
Originally Posted by silvergray545 View Post
I'm literally having the same exact problem. Check out my thread in the track subforum.

http://www.m3forum.net/m3forum/showthread.php?t=589640

I have a track event next weekend. I bled the cooling system again, will add water wetter and have my CSF oil cooler installed. Fingers crossed, this fixes the issue.
I hope the CSF oil cooler fixes your heat issue since I'm also thinking of going that route. Is your car overheating on normal drives at high ambient temperature? My overheats only when I'm throttling at high RPM.
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Old Sat, Jul-15-2017, 03:02:42 PM   #5
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Default Re: Overheating water temp at high rpm.

Quote:
Originally Posted by ThunderMoose View Post
if you guys do a leakdown test, please post results to add to the collective knowledge. Most people are thinking if the pump is ok and the radiator is properly bled that there is most likely a HG leak. It will be good to confirm or rule out HG.
I'm about to do Block Tester today at idle and at mid rev to see if there is any exhaust gas leaking into coolant. If nothing shows, I'll do a compression check and leak down to double check.

So far I took out spark plugs and nothing is fouling up or showing any sign of coolant contamination. I'm running stock cooling components so this maybe the time to replace them, starting with oil cooler.
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Old Sat, Jul-15-2017, 03:11:12 PM   #6
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Default Re: Overheating water temp at high rpm.

I recall a thread while back with the same issues / use for the car. The rad solved the problem. It wasn't capable of efficiently cooling the system to that level of use anymore. Internal deposits, external obstruction / wear...anyway that was the fix.
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Old Sat, Jul-15-2017, 03:16:20 PM   #7
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Default Re: Overheating water temp at high rpm.

Thanks for input. Did the car you mentioned only overheat at the limit, but fine driving around the city? Did the rad solve the problem or did he also replaced the oil cooler?
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Old Sat, Jul-15-2017, 03:37:18 PM   #8
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Default Re: Overheating water temp at high rpm.

Quote:
Originally Posted by ThunderMoose View Post
if you guys do a leakdown test, please post results to add to the collective knowledge. Most people are thinking if the pump is ok and the radiator is properly bled that there is most likely a HG leak. It will be good to confirm or rule out HG.
That's my next step if my temps don't improve this next weekend. Will post results.
Quote:
Originally Posted by IRM3 View Post
I hope the CSF oil cooler fixes your heat issue since I'm also thinking of going that route. Is your car overheating on normal drives at high ambient temperature? My overheats only when I'm throttling at high RPM.
Thanks, I hope so too. My car does not overheat during normal driving in high ambient temps. Needle stays dead center. My coolant temps creep up near red about 1/2 to 3/4 of a session on track.
Quote:
Originally Posted by PITT M3 RR View Post
I recall a thread while back with the same issues / use for the car. The rad solved the problem. It wasn't capable of efficiently cooling the system to that level of use anymore. Internal deposits, external obstruction / wear...anyway that was the fix.
I must have read the same thread or a one similar. I just did a whole refresh of my cooling system. Everything is new OEM except the radiator. I went with the CSF triple pass radiator. I actually got in contact with CSF regarding the issue. They're working with me step by step to solve the heat issue. We'll see what happens.
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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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2014 VW GLI 6MT - Black/Black
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Old Sat, Jul-15-2017, 03:45:52 PM   #9
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Default Re: Overheating water temp at high rpm.

I have a feeling it's the CSF radiator as few members had bad experience with it.
Good luck, keep up updated.
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Old Sat, Jul-15-2017, 03:52:51 PM   #10
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Default Re: Overheating water temp at high rpm.

Quote:
Originally Posted by kokgo20 View Post
I have a feeling it's the CSF radiator as few members had bad experience with it.
Good luck, keep up updated.
To be fair, I was overheating with the stock cooling system before the CSF radiator. Not ruling the CSF radiator out but wondering if there is another variable (HG or oil temps).
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2004 BMW M3 6MT - TiAg/Gray
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
TCK D/A | Lightwerkz Projector Headlights | LeatherZ Interior Bits | BMW Performance Knob | OEM Square 17x9 Roadstars

2014 VW GLI 6MT - Black/Black
APR stage 1 tune | CTS Turbo intake | CTS Turbo 3" downpipe | ST coilovers


E46 M3 Build Journal
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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)