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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Replacing my radiator with a pinhole leak



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      12-26-2020, 07:11 PM   #1
MadDog89
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Replacing my radiator with a pinhole leak

Planning to replace my radiator along with upper and lower radiator hoses. Is there anything else I should replace while I am at it? Car has 106k on it.
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      12-26-2020, 09:53 PM   #2
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Planning to replace my radiator along with upper and lower radiator hoses. Is there anything else I should replace while I am at it? Car has 106k on it.
Consider tensioner/pulley as it gives more access when that stuff's out. Listen to your fan as that's an obvious one if it's not spinning smooth. Also you can get an aluminum Mickey Mouse fitting to replace the stock plastic coming off the block to the thermostat.

And going into the "those I really rather not replace unless it's actually broken category" is checking the AC compressor and Power Steering pump.
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      12-27-2020, 03:47 PM   #3
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Consider tensioner/pulley as it gives more access when that stuff's out. Listen to your fan as that's an obvious one if it's not spinning smooth. Also you can get an aluminum Mickey Mouse fitting to replace the stock plastic coming off the block to the thermostat.

And going into the "those I really rather not replace unless it's actually broken category" is checking the AC compressor and Power Steering pump.
I just recently replaced belt, tensioner, and all the pulleys when I did my OFH gasket along with aluminum Mickey Mouse fitting haha

Today I took the fan out to check, and a pin hole leak has developed into something much larger. Good thing I decided to check, it appears to be coming from the driver side near the transmission cooler inlet.
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      12-27-2020, 09:43 PM   #4
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Originally Posted by bluewater328 View Post
Consider tensioner/pulley as it gives more access when that stuff's out. Listen to your fan as that's an obvious one if it's not spinning smooth. Also you can get an aluminum Mickey Mouse fitting to replace the stock plastic coming off the block to the thermostat.

And going into the "those I really rather not replace unless it's actually broken category" is checking the AC compressor and Power Steering pump.
I just recently replaced belt, tensioner, and all the pulleys when I did my OFH gasket along with aluminum Mickey Mouse fitting haha

Today I took the fan out to check, and a pin hole leak has developed into something much larger. Good thing I decided to check, it appears to be coming from the driver side near the transmission cooler inlet.
Sucks. At least you're ahead of it. Good luck.
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      01-02-2021, 04:52 PM   #5
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Does anyone know the part number for the auto trans cooler to radiator hose o-ring is? I want to replace them while I am at it, but can't seem to find anything.
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      01-02-2021, 06:54 PM   #6
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Does anyone know the part number for the auto trans cooler to radiator hose o-ring is? I want to replace them while I am at it, but can't seem to find anything.
I think this is what you're looking for:

https://www.fcpeuro.com/products/bmw...br-17227581147
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      01-03-2021, 03:50 PM   #7
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Originally Posted by MadDog89 View Post
Does anyone know the part number for the auto trans cooler to radiator hose o-ring is? I want to replace them while I am at it, but can't seem to find anything.
I think this is what you're looking for:

https://www.fcpeuro.com/products/bmw...br-17227581147
IIRC, that o-ring comes with certain radiator kits like the Nissens.
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      01-05-2021, 09:56 PM   #8
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Got my Behr radiator, can't get that thing positioned. Anyone have any tricks? It doesn't just slide in.
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      01-10-2021, 07:21 AM   #9
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I just finished replacing my radiator, decided to also replace all of the hoses and water pump while I was at it. With the fan off, you will need to angle it so it's positioned like you're sliding the driver's side into place first, the passenger side should then fit into place.
This was the second leak my coolant system developed in the last 3 months, I figured if I needed to drain it I may as well replace everything.
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