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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 Mon, Jun-19-2017, 02:43:40 PM   #31
mpower22
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Default Re: Running hot in higher temp climates

Exactly on point. Regardless if I was on the fences or not about that topic, it's safe to say I'd go with the guy with 33,000 posts
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Old Mon, Jun-19-2017, 02:49:26 PM   #32
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Default Re: Running hot in higher temp climates

This kind of stuff always gets me going, so my brief research shows:
- Deionized water typically is flowed through resin to remove + ions (Na+, Ca2+), from the pipes (Fe2+, Cu2+); there can be other impurities and residue from the resin itself.
- Distilled water is also deionized.
- Deionized water will become acidic if left open to the atmosphere, as it sucks in ions from CO2 and other sources to find equilibrium. CO2 absorption results in carbonic acid. This doesn't happen instantly, but tells me a bladder or pushing the air out of a plastic milk carton type container are good ideas for storing deionized/distilled water.
- If a cooling system boils and has tap water in it, it is primarily these same compounds that leave crust on the inside.
- These elements removed from deionized or distilled water allow more current flow in tap water; conversely, since the water is in motion, tap water generates some current, which will tend to precipitate out impurities. This is part of the reason you put coolant in, to counteract this activity. There is less concern, therefore with corrosion from deionized water, without antifreeze (not suggesting going without).
- 50/50 mix takes boiling point from water (212) to mix (223). I didn't reseach calculations, but it is generally accepted that water will pull away WAY more heat than coolant. If you want a bunch of facts on this check out Redline water wetter spec pdf. (I'm not a redline fan overall, but this stuff looks good and lots of facts on this sheet - like that in some situations, water only can freeze with AC use in warm temps).

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Old Mon, Jun-19-2017, 05:51:44 PM   #33
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Default Re: Running hot in higher temp climates

A few months ago, replaced the coolant with 5 qts of distilled water, 5 qts of factory coolant, installed ActiveAutowerk's sport fan clutch and a new BMW fan. Drove to Reno this past Friday. It was 105+ deg in Sacramento and about 110 deg driving through Placerville on Hwy 80. Had the AC on the whole time. No problems at all; the temp. gauge needle never went past 12:00 o'clock position. For clarification, I had a new genuine BMW radiator installed some years ago, and it's holding up fine; strangely enough, this new radiator cools better than the one the factory installed. Phew!
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Old Mon, Jun-19-2017, 05:55:19 PM   #34
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Default Re: Running hot in higher temp climates

Check your water pump, make sure it is not leaking. I have the same issue, I'm swapping it out this weekend.
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Old Tue, Jun-20-2017, 10:00:42 AM   #35
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Default Re: Running hot in higher temp climates

This topic emerges every summer. 3/4 is not overheating nor abnormal, especially when going uphill.

Check the manual, normal operating range is between blue and red, and 3/4 is 100C

Still, there are many who never see above 1/2, but they also never changed the upper water temp sensor which can read lower over time. A friend of mine was in this category, never went above 1/2. We tapped another sensor and sure enough his temps were actually higher. He changed his temp sensor and now his needle does go above 1/2 when going uphill.
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Old Tue, Jun-20-2017, 12:57:24 PM   #36
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Default Re: Running hot in higher temp climates

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Originally Posted by silaciM3CS View Post
This topic emerges every summer. 3/4 is not overheating nor abnormal, especially when going uphill.

Check the manual, normal operating range is between blue and red, and 3/4 is 100C

Still, there are many who never see above 1/2, but they also never changed the upper water temp sensor which can read lower over time. A friend of mine was in this category, never went above 1/2. We tapped another sensor and sure enough his temps were actually higher. He changed his temp sensor and now his needle does go above 1/2 when going uphill.
I'm sorry, but this is just not correct. I've had three e46 M3s, two from brand new, two of which were tracked. It is not "overheating" (engine damage), but it is abnormal and indicative of a cooling system that is not functioning properly. I've never seen any of them hit the 3/4 mark in any condition.

Including driving through the desert in the summer. Including on track.
(both of which I've done with them)
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Old Tue, Jun-20-2017, 03:22:36 PM   #37
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Default Re: Running hot in higher temp climates

How does 20 coolant/80 water in Georgia sound? Rarely goes below freezing here.
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Old Tue, Jun-20-2017, 03:31:12 PM   #38
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Default Re: Running hot in higher temp climates

I wouldn't run anything other than 50/50 outside of a dedicated race car with insufficient cooling system capacity.
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Old Wed, Jun-21-2017, 01:55:12 AM   #39
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Default Re: Running hot in higher temp climates

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Originally Posted by Obioban View Post
If it's over heating in motion, the rad's the problem (assuming you got an OE water pump/thermostat).

If it's overheating at rest, you need a new fan clutch and/or aux fan (start with fan clutch).
This is probably partially true, my rad is fine but was overheating in motion. After fan clutches replaced, no more overheating.
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Old Wed, Jun-21-2017, 04:19:46 AM   #40
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Default Re: Running hot in higher temp climates

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Originally Posted by ///M3 NA View Post
This is probably partially true, my rad is fine but was overheating in motion. After fan clutches replaced, no more overheating.
This is my same issue. Overheating on track. Everything is new except fan clutch (didn't change due to possibility of doing the electric conversion), wondering if new fan clutch will solve the problem.
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Discussing Running hot in higher temp climates 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)