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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, Oct-16-2019, 07:39:16 PM   #41
JohnVu
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Default Re: Overheating in Traffic—Aftermarket Radiator Daily Performance

I live in Houston and on hot 100+ degree days with the AC on, I had overheating issues in traffic. The needle would consistently go over the middle mark to the red dot and I would have to start blowing the heater on full blast to calm it down. I had a fully stock cooling system that was filled with OEM coolant and distilled water.

In order to remedy the overheating issue, I decided to swap the OEM clutch fan to the Mishimoto Electric fan system. I can happily report that I no longer have any overheating issues sitting in stop and go traffic with the AC on full blast. I daily drive the car and the ambient temp gauge has gotten to 110 degrees but the water temp needle is was rock solid in the center. I also took the car to the track on September 13th win 95 degree weather and the water temp needle never moved from the center spot; however the oil temp was another story.

So all in all, swapping the clutch fan out should solve your overheating issues. No need for an aftermarket radiator. Just make sure everything is bled properly and the rest of the cooling system is up functioning properly. Another plus is that you can work on the front of the engine without having to remove the fan.
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Old Thu, Oct-17-2019, 07:21:21 PM   #42
Toxic0n
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Default Re: Overheating in Traffic—Aftermarket Radiator Daily Performance

I still don't understand why people are choosing to go with aftermarket for an important cooling system component rather than replacing the proven OEM fan clutch. Is it the 5hp gain at the expense of increased electrical system load?

My OEM fan clutch lasted 18 years and 200,000 KM. Mishimoto hasn't even been in business for 18 years at this point and I don't think they will be around in 18 years either. You think their fans will still be working?

I sleep better at night knowing that my new fan clutch will probably outlast the rest of the car at this point.
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Old Thu, Oct-17-2019, 07:52:02 PM   #43
fattycharged
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Default Overheating in Traffic—Aftermarket Radiator Daily Performance

Quote:
Originally Posted by JohnVu View Post
I live in Houston and on hot 100+ degree days with the AC on, I had overheating issues in traffic. The needle would consistently go over the middle mark to the red dot and I would have to start blowing the heater on full blast to calm it down. I had a fully stock cooling system that was filled with OEM coolant and distilled water.

In order to remedy the overheating issue, I decided to swap the OEM clutch fan to the Mishimoto Electric fan system. I can happily report that I no longer have any overheating issues sitting in stop and go traffic with the AC on full blast. I daily drive the car and the ambient temp gauge has gotten to 110 degrees but the water temp needle is was rock solid in the center. I also took the car to the track on September 13th win 95 degree weather and the water temp needle never moved from the center spot; however the oil temp was another story.

So all in all, swapping the clutch fan out should solve your overheating issues. No need for an aftermarket radiator. Just make sure everything is bled properly and the rest of the cooling system is up functioning properly. Another plus is that you can work on the front of the engine without having to remove the fan.


The clutch fan is not and was not your issue.
I can run in 100deg weather in Houston traffic with the AC blasting with no fan and don’t hit those temps, but my h20 pump and thermostat are new.


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Discussing Overheating in Traffic—Aftermarket Radiator Daily Performance 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)