I am about to replace water pump in my 2012 e350 w212. Seems to be a leak in the gasket, and the lower hose. I checked the hose and it's intact no cracks. IMO could be the O-ring. I will replace that first. Anyone have experience with similar coolant leak?
Anyone try coolant leak additive, or it's just snake oil?

 

DO NOT put in gunk. Period. If you do - SELL THE CAR to a stranger ASAP. Someone who does not know where you live, and not someone at work.

 

If you intend to keep the car for a while, do not clog up your tiny coolant passages with that stuff,

 

Snake oil.

 

I just did the pump and a bunch of other things in that area on my E550. Pretty easy. Should be far easier for you since you have a lot more space.

 

Very simple: EVERY undersized skinny O-ring you disturb needs to be replaced NEW
else you have a leak to fix with repeat labor.

The hard part is sourcing all the worthless parts that make the job a pass/fail.


The stock cooling system runs efficiently without the engine accumulating heat...

 

Hi! I was doing my thermostat and water pump today. Broke one of the bolts that connected the water pump bracketing to the timing case. It's a T30 Hex Head. There are 6x of them. The part numbers I've come across do not look anything like the correct bolt. Does anyone have any recommendations? VIN: WDDHF5KB6DA713357

Some additional context: There are 4x T45 Hex Bolts that also secure the water pump assembly to the engine block. I am specifically looking for the smaller T30 bolts that also secure the pump assembly to the engine block.

Thank you!