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Old 06-29-2019, 03:48 PM   #1
reelizmpro
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Urgent: M42 radiator with S50/S52 swap

I am using an M42 radiator with my S52 swap and it's overheating. I've bled the system every way imaginable except vacuum and coolant always ends up boiling out of the cap once it reaches operating temperature. I've block tested for exhaust gases and it came up negative. I've changed the thermostat, water pump, radiator x2 and cap. I have a brand new M42 radiator i was going to try next but honestly don't think it will make a difference as I have already tried 2 different used radiators. I think I'm going to just get a M coupe radiator with late model expansion tank. Could it be that the M42 radiator core is too small for the S52?
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Old 06-29-2019, 10:18 PM   #2
johnwoo
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Very much so, I’ve never felt confident in the m42 radiator even having a m42. But i ditched that thing in a heartbeat for a bigger radiator, even thot its a pain to route the hoses to the firewall where I have the overflow tank, but its better piece of mind
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Old 06-30-2019, 12:34 PM   #3
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Thanks to this thread...

https://www.r3vlimited.com/board/sho...zOsXlklrpQKpfA

It appears to have worked the very first time! Going to let the car cool down to see where the coolant level is and drive it again. I will be shopping for a late model coolant reservoir and aluminum M roadster/coupe radiator soon for that extra peace of mind but so far, so good.
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85 323i M TECH 1 S52 - ALPINEWEISS/SCHWARZE
88 M3 - LACHSSILBER/SCHWARZE
89 M3 - ALPINEWEISS II/M TECH CLOTH-ALCANTARA
91 M TECHNIC TURBO - MACAOBLAU/M TECH CLOTH-LEATHER
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Old 07-02-2019, 11:27 AM   #4
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Drove the car the other day in 82F weather and coolant started boiling over again...(sigh). I ordered a CSF E36 aluminum radiator. This should cure my overheating issue.
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"I'd probably take the E30 M3 in this case just because I love that little car, and how tanky that inline 6 is." - thecj

85 323i M TECH 1 S52 - ALPINEWEISS/SCHWARZE
88 M3 - LACHSSILBER/SCHWARZE
89 M3 - ALPINEWEISS II/M TECH CLOTH-ALCANTARA
91 M TECHNIC TURBO - MACAOBLAU/M TECH CLOTH-LEATHER
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Old 07-02-2019, 11:32 AM   #5
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I run an M42 radiator with an M50 and a 80/88 sensor and haven't had trouble. Car heats up after coming off the freeway, the electric fan comes on and catches it, everything is fine.


How are your heater hoses routed? TB heater? What temperature is your aux fan sensor?
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Old 07-02-2019, 12:45 PM   #6
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I wouldn't trust the M42 radiator for, say, track use, but I have had absolutely no trouble filling and bleeding it the normal way.
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Old 07-02-2019, 11:05 PM   #7
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Running an M42 radiator with an S52. Stays below half when moving & creeps up slowly when stopped, but Spal Pusher fan kicks in just right of center with the 82 sensor.
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Old 07-03-2019, 09:47 AM   #8
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Barry, I went with the stock e36M3 rad & e30 external resivour because of hints I had heard of overheating.
I've never been impressed with swaps that use the m42 radiator, mainly to keep things looking clean. Let me know how the new set up ends up working for you.
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Old 07-03-2019, 11:51 AM   #9
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M42 radiator sucks. E30/E36 radiator only.
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Old 07-03-2019, 12:03 PM   #10
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Quote:
Originally Posted by nrubenstein View Post
I wouldn't trust the M42 radiator for, say, track use...
Me either.
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Quote:
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would be in depending on tip slant and tube size
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