I recently replaced the motor mounts on my 09 528i with 215k miles, along with all the gaskets having to do with the valve cover. While I replaced the motor mounts, there has been a small seepage from where the upper radiator hose connects to the radiator. I have replaced the coolant hose, and there is a tiny leak still that only leaks a few drops about once a week. I've checked the coolant level and it only goes down slightly, not enough for concern.

is there an epoxy (like JB weld?) that I can make into a putty and essentially "seal" the area around the plastic side of the radiator? I'm trying to avoid air pockets and obviously coolant leak(s).

Worst case is I have to replace the radiator (which I suppose is original) but really trying to avoid it until maybe tax season - definitely not with the holidays coming up.

Any thoughts or advice would be extremely helpful.

 

The only way you'll stop it is by replacing it unless you know how to fix the top part of the radiator. Just tried it out until you get the funds to buy a radiator. I wouldn't worry about any air pockets if it's leaking how you say it is. Every few weeks top up the reservoir.

 

I'm going to try some JB weld and create a "seal" so at the very least the leak stops. I replaced the lower engine cover with a plastic (instead of the factory felt material) that is easier to clean and won't bleed thru like the felt OEM material. This way if something leaks 1. I will know/see it on the driveway. 2. can be easily wiped off.

Thanks for the tip.