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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 Wed, Jul-11-2018, 03:07:32 PM   #31
bigjae1976
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Default Re: 2003 M3 overheating THE WEIRDEST THING

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Originally Posted by Saimon69 View Post
Man that is a one sexy expansion tank. Really looks like a piece of art.

Itís a Canton Racing 2L tank. Itís great...only 2 downers is itís hard to see the water level without a flashlight and itís hard to fill without spilling due to its location.


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Old Wed, Jul-11-2018, 03:19:07 PM   #32
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Default Re: 2003 M3 overheating THE WEIRDEST THING

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.[/QUOTE]

From doing the cluster test it shows 96c when the needle starts to cross the center and the highest I got was 99c in various situations but never when moving.
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Old Wed, Jul-11-2018, 03:45:53 PM   #33
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Default Re: 2003 M3 overheating THE WEIRDEST THING

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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.


From doing the cluster test it shows 96c when the needle starts to cross the center and the highest I got was 99c in various situations but never when moving.[/QUOTE]



Same here when it reaches 96c the needle starts moving past the half way mark and towards 3/4 mark.
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Old Wed, Jul-11-2018, 03:51:57 PM   #34
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Default 2003 M3 overheating THE WEIRDEST THING

So your temps were 205-210 Degrees Fahrenheit with 93 degree heat and humidity. Itís really high here in Vegas currently at 45%.

Thatís pretty much where my car was yesterday driving home on the freeway going 70 with the AC on.

My ZHP usually ran around the same temps as well. What is considered running too hot?

My temp gauge doesnít hit the second dot as itís been coded to be more accurate.
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Old Wed, Jul-11-2018, 03:57:50 PM   #35
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Default Re: 2003 M3 overheating THE WEIRDEST THING

My temp gauge doesnít hit the second dot as itís been coded to be more accurate.[/QUOTE]


What do you mean by coded to be more accurate?
Can you explain what's the oe values, to what you changed It to and who's doing this kind of coddling?
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Old Wed, Jul-11-2018, 05:34:32 PM   #36
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Default Re: 2003 M3 overheating THE WEIRDEST THING

The OE oil gauge is accurate. The water temp gauge is not accurate. At least it isnít in my car comparing to a VEI temp gauge and the standard 1/8Ē NPT sender and an AiM Solo DL reading the ECU.

I think the water temp gauge reads from the outlet of the thermostat but is affected by the temp sender on the lower hose of the radiator.

My guess is there is coding in the ECU which controls the aux fan AND it will move the needle when outlet temps increase with the auxiliary fan on. Again, my coolant gauge in the cluster has little correlation to the actual temps. Iíve witnessed the OE gauge go to 3/4, water temp readings remain stable but my outlet temp reading which was stabilized is now increasing.


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Old Wed, Jul-11-2018, 07:01:39 PM   #37
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Default 2003 M3 overheating THE WEIRDEST THING

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Originally Posted by Saimon69 View Post
What do you mean by coded to be more accurate?

Can you explain what's the oe values, to what you changed It to and who's doing this kind of coddling?
Read post #15...

https://r.tapatalk.com/shareLink?sha...7&share_type=t

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Last edited by WOLFN8TR; Thu, Jul-12-2018 at 02:38:58 AM.
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Old Wed, Jul-11-2018, 07:23:17 PM   #38
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Default Re: 2003 M3 overheating THE WEIRDEST THING

Also have to wonder if the temp sensor behind the thermostat is causing this issue.

Iíve seen a couple with a white crust on it. Being a resistance based sensor, I would imagine that any surface contamination will screw with the reading.


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Old Wed, Jul-11-2018, 07:36:37 PM   #39
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Default Re: 2003 M3 overheating THE WEIRDEST THING

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Originally Posted by bigjae1976 View Post
Also have to wonder if the temp sensor behind the thermostat is causing this issue.

Iíve seen a couple with a white crust on it. Being a resistance based sensor, I would imagine that any surface contamination will screw with the reading.


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I have a new oem temp sensor installed.
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Old Wed, Jul-11-2018, 08:02:58 PM   #40
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Default Re: 2003 M3 overheating THE WEIRDEST THING

One thing Iíd be curious about is how much carbon build up do you have on your pistons and valves.

Iíve seen some motors have a lot of carbon build up on the piston crowns. That can cause a motor to run hot.


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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)