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DIY Mercedes C55 Coolant Leak at Plastic Y pipe Repair!
My car suffered a slow then rapid coolant leak at the upper driver side radiator plastic end tank last year with 140,000mi. The crack grew from a hair line to more than 6 in one day resulting low coolant warning then noticeable engine temp rise. I shut the car down and Amazon next day rescue radiator came and its been running fine until now.
Another low coolant light came on the other day, 152,000mi but this time I smelled and saw evaporating coolant from my AC vents. Luckily I was just two blocks from home. This time the leak was tracked down to a broken brittle plastic 3 way pipe that goes from the engine block to Y pipe then to the passenger heater core. There is a scalloped hole that released the coolant. This Y pipe is located under the windshield wiper assembly which requires disassembly along with plastic air intake and various plastic trim. Maybe a leisurely two hour job.
Couldn't find the part online after some rigorous searching so the dealership has the upper for $46 and the lower has to be ordered for $40. It's a two piece unit with a spring loaded quick disconnect. This is physically located at the highest point in the coolant flow system and probably absorbs the highest coolant temperature. Same thing happened twice to my old 97 Mercedes S500 (203,000mi). It's in the DNA...dang plastic embrittlement.
Instead I went to Lowes and configured a replica Y pipe from galvanized steel fittings for a total of $10. Used nuclear grade pipe sealant!
Hello! What is part's number of Y pipe? Have the same problem but would prefer buying oem part
Hi, use a http://mbepc.net. If I am not mistaken if vehicle without 875 code A 203 830 24 96 and A 203 830 03 96 if vehicle has this heated washer fluid.
I'm all for OEM parts and originality (within reason), but sadly these cars will probably never again be worth $$$$ (even tough they should be) and the parts still are, so reliability and cost will trump originality for stuff like this, at least for me.
What caused that hole? Some sort of melting wax pressure relief that failed over time, or wear from vibration? Definitely a weak spot.
I would've painted it black to blend in better though...
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