Leaky W123 Radiator: Repair or Replace? - PeachParts Mercedes-Benz Forum

nategodin · #1 11-10-2004, 11:11 PM

Hello,
Last week I noticed a bit of coolant on the front of my engine. It was splattered around pretty randomly... all over the hoses, fan shroud, valve cover, etc. So, I cleaned up the mess and started watching it like a hawk for the next few days. I'm pretty sure that the coolant is leaking from the top seam of the radiator, where the plastic meets the metal, running down the fan shroud, and hitting the fan. (A moment of silence for the late great Warren Zevon, please) I've also checked the cap for signs of leakage by wrapping it with a paper towel held on by a rubber band, but the cap appears to stay dry as coolant continues to pool at the top seam. It doesn't appear to be leaking down from the top hose either, though I haven't tried the paper towel test there (yet). Would it be better to just replace the radiator and hoses rather than attempt to get it repaired? From what the search turned up, it sounds like people are paying $75-150 to have their leaky radiators fixed, but because of the plastic/aluminum construction, the repairs don't always last. I can get a new Behr radiator with all the fixin's (2 hoses, mount kit, cap and drain plug) for about $200. Am I better off just replacing it? The procedure to remove and replace the radiator, 20-420 in the shop manual, looks pretty simple, although disconnecting the oil cooler sounds messy. Is it possible to do the job without disconnecting the oil cooler?

Thanks in advance,
Nate

tangofox007 · #2 11-10-2004, 11:29 PM

Replace it. Don't waste time and money on a radiator that old. (Assuming it is original.)

Eric Eliel · #3 11-10-2004, 11:33 PM

New Behr for $200?

Well I just checked and that is a huge difference between a 82 240D radiator vs. an 84 300DT radiator.

Whats the difference folks?

Brian Carlton · #4 11-10-2004, 11:46 PM

Quote:

Originally Posted by nategodin

The procedure to remove and replace the radiator, 20-420 in the shop manual, looks pretty simple, although disconnecting the oil cooler sounds messy. Is it possible to do the job without disconnecting the oil cooler?

From what I can recollect when I owned the 123, I believe that it is identical to my 126 (300 SD). The oil cooler can easily be unbolted from the main radiator using two bolts, one at the top and one at the bottom. No need to remove the oil cooler lines from the oil cooler and take the risk of cracking the oil cooler or stripping the threads in the process.

nategodin · #5 11-11-2004, 01:29 AM

Thanks for all the quick replies.

Tangofox: Yup, I think you're right. The real question though, is how much of a pain in the @$$ is it going to be to pull the radiator?

Eric: I think the difference is that the turbo models have an expansion tank mounted on the fender; my non-turbo 240D doesn't. I'm sure someone more knowledgeable than I could tell you why that is.

Brian: I think (and hope!) you're right about the oil cooler. That's the "thing of it", as they say. The Haynes manual agrees with you, although the oil cooler bracket is attached with a clip at the top rather than a bolt. I figured I'd ask since the two manuals that I have give slightly different procedures.

Hopefully I can get everything installed before the snow starts flying. If only I had a heated garage... or even a paved driveway! Luckily, I have friends who are probably foolish enough to let me use theirs. I'll have to do my best to avoid rewarding them with a puddle of antifreeze. In the meantime, I'll try using a product like BarsLeaks. I searched for it on the forum, and if it's good enough for LarryBible's 240D...