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W124 300D Coolant Leak after installing OEM overflow tank cap
Hey guys, been lurking about a year but this is my first post. I purchased a used 300D a couple years ago and have been doing some maintenance to get it back to daily driving condition. The motor itself runs great. I noticed large fluctuations in temperature during our hot summer but never over heated it. No coolant in oil or oil in coolant.
I decided to replace the radiator expansion tank cap after noticing the current one was generic and fit loosely. I did add a mix of zerex g-05 and distilled water until it seemed at a proper level prior to the install. After the car warmed up I capped it and not long after the car started dumping coolant from the rear of the motor towards the driver’s side. Some of the coolant was green so I know it didn’t always receive the proper coolant.
i was thinking freeze plug but I’m not sure and hoping you guys have some input. I would like to repair it myself but I’m not quite sure yet.
i have a video but am having trouble uploading I’ll try in another post. Hopefully these aren’t too low resolution
thanks in advanced
Last edited by desertdiesel; Mar 24, 2024 at 07:19 PM.
Not sure where you're located, but here in the U.S. the Zerex G-xx coolants are sold already cut to 50/50 -- no need to add water. Any chance you mixed it with water and it's boiling out?
Not sure where you're located, but here in the U.S. the Zerex G-xx coolants are sold already cut to 50/50 -- no need to add water. Any chance you mixed it with water and it's boiling out?
i bought non diluted. They sell both at my Napa in Phoenix. Where would it be boiling out from?
There was green coolant from the other owner, I feel like I’ve read somewhere that some of the coolant is in the back of the motor or something and that there’s another drain back there on the bottom for a proper flush.
Here’s a link to my video. It’s not letting me upload
i bought non diluted. They sell both at my Napa in Phoenix. Where would it be boiling out from?
There was green coolant from the other owner, I feel like I’ve read somewhere that some of the coolant is in the back of the motor or something and that there’s another drain back there on the bottom for a proper flush.
Here’s a link to my video. It’s not letting me upload
Go to https://mb.vin and enter your VIN. PM me digits 4-9 of your VIN and the first 6 digits of the engine code. I'll check the MB WIS and see what's there about your engine's cooling system and return a copy to you.
Go to https://mb.vin and enter your VIN. PM me digits 4-9 of your VIN and the first 6 digits of the engine code. I'll check the MB WIS and see what's there about your engine's cooling system and return a copy to you.
thank you. I’ll get it to you tomorrow, when I’m back home.
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