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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, 04:41:12 PM   #11
black bnr32
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Default Re: Overheating water temp at high rpm.

I assume there's a thermostat in the stock oil cooling system, no? maybe it's not cooling the oil at all.
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Old Sat, Jul-15-2017, 05:19:58 PM   #12
IRM3
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Default Re: Overheating water temp at high rpm.

I do have stock ODV but the car should overheat under normal driving if that fails.
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Old Sat, Jul-15-2017, 05:33:23 PM   #13
black bnr32
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Default Re: Overheating water temp at high rpm.

?
I disagree.
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Old Sat, Jul-15-2017, 06:03:01 PM   #14
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Default Re: Overheating water temp at high rpm.

Driving in the city in 115 degrees with AC on with no oil cooling should raise the temp, but I had no temp issue under such condition.
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Old Sat, Jul-15-2017, 06:25:13 PM   #15
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Default Re: Overheating water temp at high rpm.

I don't remember the exact thread but I'm 99% sure a new OEM rad was the FIX. After, the old was cut open and the passegess were reduced by nearly half their capacity as deposits and build up accumulated. You could soak it in an aluminum / plastic safe solvent to break that up, then flush.

I took out my behr e36 unit during my swap, back flushed it and blew compressed air the opposite direction. I got a ton of shit out.
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Last edited by PITT M3 RR; Sat, Jul-15-2017 at 07:21:25 PM.
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Old Sat, Jul-15-2017, 06:47:18 PM   #16
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Default Re: Overheating water temp at high rpm.

Quote:
Originally Posted by PITT M3 RR View Post
I don't remember the exact thread but I'm 99% sure a new OEM rad was the culprit. After, the old was cut open and the passegess were reduced by nearly half their capacity as deposits and build up accumulated. You could soak it in an aluminum / plastic safe solvent to break that up, then flush.

I took out my behr e36 unit during my swap, back flushed it and blew compressed air the opposite direction. I got a ton of shit out.

I will try that. Thank you for suggesting it. I was looking into Bluedevil radiator flush but I don't want to risk putting anything corrosive in my engine block. I'll take the rad out and flush it that way.
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Old Sat, Jul-15-2017, 07:23:11 PM   #17
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Default Re: Overheating water temp at high rpm.

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Originally Posted by IRM3 View Post
I will try that. Thank you for suggesting it. I was looking into Bluedevil radiator flush but I don't want to risk putting anything corrosive in my engine block. I'll take the rad out and flush it that way.
Fixed my post, new oem Rad was the FIX*** old one was compromised at race level stresses.
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Old Sat, Jul-15-2017, 10:14:55 PM   #18
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Default Re: Overheating water temp at high rpm.

Hey IRM3, glad you posted this. We were having the same problem at Thill.
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Old Sat, Jul-15-2017, 11:00:54 PM   #19
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Default Re: Overheating water temp at high rpm.

Stupid I know, but I've noticed this on mine a few times when I've overfilled the oil slightly by mistake. Usually cruising around my oil temp needle is at 11:30, when overfilled it would sit at 12:30 and regularly climb up to 215*. Water temp was also warmer than normal.

Sucked 1/4 L out and back to normal.
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Old Sun, Jul-16-2017, 08:54:18 PM   #20
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Default Re: Overheating water temp at high rpm.

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.
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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)