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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 05-02-2015, 01:10 AM
BavarianE31 BavarianE31 is offline
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M52 vs M54 Cooling Systems...

So a friend on mine went out and bought a radiator and expansion tank for a cooling system refresh and realized that he got a M52 setup rather than a M54 (he owns a 530i).

I'm wondering what exactly are the differences between the two? I see that the radiator of the M52 doesn't have a place for the aux water pump and the expansion tank only has 2 ports instead of the 3 on the M54.

My friend will be returning his purchase, but just out of curiosity, could one actually retrofit a M52 expansion tank/radiator into a M54 setup? Would the hoses connect properly? Or are they that different?
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  #2  
Old 05-02-2015, 05:05 AM
m735is m735is is offline
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Mein Auto: e23, e32, e34, e39
m52 radiators have the old style clamp on hose connections. m52TU/m54? have the press fit style.

m52TU aux water pump goes to one of the two expansion tank connections, not sure about m52

Does his radiator have press fit connections or clamp on ones?

What year is his?
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  #3  
Old 05-02-2015, 09:53 AM
BavarianE31 BavarianE31 is offline
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He has a '98 so I believe it's the old style clamps. Doesn't seem easily possible to retrofit huh?
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Old 05-02-2015, 09:54 AM
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Zerodynamic Zerodynamic is offline
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Quote:
Originally Posted by BavarianE31 View Post
He has a '98 so I believe it's the old style clamps. Doesn't seem easily possible to retrofit huh?
Even if you could, I wouldn't. I don't understand why BMW has to use the quick connect fittings, they are such a pain!
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  #5  
Old 05-02-2015, 10:39 AM
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bluebee bluebee is offline
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Mein Auto: 02 BMW 525i M54 auto 130K
I can only tell you what the M54 looks like, which is here:
- Behr radiator and Behr expansion (aka surge) tank autopsy (1) (2) & request for another autopsy (1)
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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Old 05-02-2015, 10:47 AM
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bluebee bluebee is offline
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Quote:
Originally Posted by Zerodynamic View Post
Even if you could, I wouldn't. I don't understand why BMW has to use the quick connect fittings, they are such a pain!
Here is a head-on view of mine (M54)...
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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Old 05-02-2015, 01:19 PM
m735is m735is is offline
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Mein Auto: e23, e32, e34, e39
If his is a 98, then it's a 528i (m52b28).

Your saying he got the radiator that has the quick connect style fittings?

Can you post part numbers for the radiator and expansion tank he got?

It will be easier to just get the correct parts.

I did entertain that exact idea this week. I had a good clamp style radiator and was going to try to fit it in my press fit car. I only thought of this because I have extra parts laying around to play with, like upper and lower radiator hoses to cut up. I just got the right radiator for $120 and did it the easy way.
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