Engine radiator VALEO or OEM BMW
The only ones that seem to be made better are the Valeo's, there's a reason they cost more. I looked at mine, it has (relatively large) tubes inside not stamped channels.
I bought the Valeo rad for my 03 GTi from Rockauto for $89. It appears to be exactly the same as stock.
I had an older BMW myself (E36) and if you want reliability you'll need aftermarket (improved) radiator, radiator hoses and water pump.
Valeo 3 row radiator is what i use and it works great
I'd buy a Valeo, but Valeo doesn't have a part number for the later Cabriolets and their catalog lists incorrect sizes. I bought my radiator locally, but I needed it ASAP and they happened to have a Valeo in stock
plastic radiator ends tend to crack and leak on the 4.4's. make sure you get an aluminum upgrade.
BMW N51 engine, SULEV radiator, these cars came with a sensor that sticks to the side of the radiator for emissions compliance. Can't even get it aftermarket anymore (last time I checked) new radiator without the sensor is like $150, with the sensor is close to $800, and no you cannot use the old sensor, if you try sticking the old sensor to a new radiator it won't recognize it and it will trigger the check engine light.
The white tank has never been the issue for me, leaks are always in the radiator frame surrounding that tank. Somewhere at the bottom, probably where the lower hose goes. The plastic is brittle crap and it develops micro-fractures that become cracks over time.
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