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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, Jun-17-2015, 12:08:10 AM   #21
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Default Re: Running hot in higher temp climates

Quote:
Originally Posted by mpower22 View Post
That's exactly why your vehicle is running hot, you should never be running 80% water in there, you are bringing the boiling point of the mixture waaaaay down. 50/50 ratio is the only one recommended by BMW, end of discussion.
Um, No.





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Old Fri, Jun-19-2015, 06:01:03 AM   #22
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Default Re: Running hot in higher temp climates

If the temp increases during slow traffic or stop and go traffic look at the fan clutch.

If the temp increases at freeway speeds, your radiator fins/condensor fins are clogged with debris (or the radiator internals are crapped up).

The level of mis-information on coolant mixture to effective heat transfer never ceases to amaze me. Heat transfer, how does it work? DirtyEtzio and icecream (sounds like the name of a hipster restaurant...) nailed it though. Afterall, it's "antifreeze" not "antiheat"... Now if I could figure out a way to have a sodium cooled engine I'd have no overheating worries on track...

FWIW: most of the surfactants (e.g., Redline water wetter) also have corrosion inhibitors, so running less antifreeze concentration along with a surfactant is no problem. From Redline's website Redline Water Wetter:

Quote:
Rust and corrosion protection allows for use of straight water in racing or reduced antifreeze levels in warm climates
A proper system bleed is essential, of course. Park nose up, turn the heat up all the way, and bleed that thing.

Now, you could have a stuck thermostat or one that is failing to open 100% too, but that's the last thing I'd check since it was recently replaced (though it's not an impossibility).

Arson8: What's your oil temp look like when this is happening? The oil cooler collects a lot of debris too, so make sure it is clean.

When cleaning, flush from engine compartment out. Don't touch the air nozzle or hose nozzle to the radiator or oil cooler. The oil cooler in particular is surprisingly fragile (don't ask).
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Old Fri, Jun-19-2015, 06:24:00 AM   #23
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Default Re: Running hot in higher temp climates

Little off topic but interesting anyway:http://www.hotrod.com/how-to/engine/...-vapor-engine/
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Old Fri, Jun-19-2015, 05:31:47 PM   #24
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Default Re: Running hot in higher temp climates

oil temps are just fine. I will check the radiator/condensor for debris
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Old Sun, Jun-18-2017, 07:07:49 PM   #25
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Default Re: Running hot in higher temp climates

Bumping an old thread, thanks for all of the good info. I was looking for the proper coolant ratio for hot climates. I recently did some cooling system work. I mixed the coolant 50/50 and the car is running exactly 15 degrees hotter than normal in 100 degree plus days. I will go with the 70/30 water/coolant ratio and see if it helps.

Found this Info:

The problem might be that the coolant mix is too rich. That is, too much "antifreeze" and not enough water. And to no one's surprise, what you do to fix it is take out some of the antifreeze and replace it with water. Reducing the mix ratio can easily lower the temperature by 15 F.

Why a rich mix gives less cooling:

Antifreeze has a much higher viscosity. This means that it will not flow as fast through the system as water, and the cooling effect will be less.

Further, the specific heat of antifreeze is less than that of water. This means that for a given temperature change, the antifreeze will carry less heat each time it circulates from engine to radiator and back.

So, if the mix is too rich, the cooling efficiency will be reduced because (1) the flow rate is less, and (2) less heat is transferred per cycle of the coolant.

The standard recommendation is to use a 50/50 mix of antifreeze and water. This represents a compromise between cooling efficiency and the ability to prevent the mix from freezing during cold weather. After all, the initial purpose of antifreeze is to prevent freezing.

But a 50/50 mix does not give the best cooling. For improved cooling in hot weather, we should use less antifreeze and more water, perhaps going to a 25/75 or a 20/80 mix ratio.
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Old Sun, Jun-18-2017, 10:52:59 PM   #26
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Default Re: Running hot in higher temp climates

80/20 is what I've been using under Florida heat and since I have access to DE-IONIZED water, it is 80 DI-water and 20 "anti-freeze". It always stays at 11:30 mark and only gets to 12-o'clock mark during pro-longed third gear run. All is good so far.

I do agree about water has better cooling capacity than "anti-freeze" whose primary design is for winter conditions. That is my understanding anyways...
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Old Sun, Jun-18-2017, 11:05:17 PM   #27
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Default Re: Running hot in higher temp climates

Mine crept up to the 3/4 mark and a hair beyond it as well... Going uphill in 100 degree desert weather during traffic.
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Old Sun, Jun-18-2017, 11:36:07 PM   #28
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Default Running hot in higher temp climates

Before the cooling system work the temps were around 198-200 degrees. now I'm seeing 210 with the 50/50 mix. I will post results after I change the ratio to 70/30.
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Last edited by WOLFN8TR; Mon, Jun-19-2017 at 02:16:19 AM.
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Old Mon, Jun-19-2017, 02:16:09 PM   #29
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Default Re: Running hot in higher temp climates

Have been having similar issue for a while. Ow, it did t bother me enough until last few days. It's gotten over a hundred in LA, with AC on temp gets to 3 /4 or more, have to shut AC offf.

Tried to stop the fan with a newspaper while engine is running, and it did very easily. Clutch is shut.

DO NOT stick your fingers in there, if your clutch is good you'll be on the way to the emergency room.

Anyhow ordered new Sachs clutch, do not get BEHR, all is good.

Good luck
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Old Mon, Jun-19-2017, 02:25:25 PM   #30
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Default Re: Running hot in higher temp climates

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).

80/20 cools better than 50/50 (due to better thermal conductivity). That said, it will corrode your hardware faster and can freeze in low temps, and shouldn't be at all necessary-- a properly functioning OE cooling system with 50/50 should be fine in death valley in July with the AC on. I would only run 50/50 in my cars. 3/4 on the gauge is not dangerously overheating, but it is abnormal behavior that indicates things aren't functioning properly.

One last thing to ponder: if you mixed coolant types (non BMW coolant), it'll form gel and clog the rad/maybe other parts, which car decrease cooling efficiency. That's what the PO of my e39 528i 5mt did, causing it to overheat whenever he drove it, causing him to sell it to me for $500
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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)