[Debacle of Mass Eruption.]

I've had my 335i for a year and I have been dealing with problem for 8 months, recently it's gotten worse. I have to go out and buy a gallon of distilled water and Pentefrost NF every 2 days because it leaking will not cease. There's also a bubbling/boiling sound coming from there that's making me kinda uneasy...
It started little by little, once a month I needed to add coolant. That turned in to once a week, and eventually every other DAY. Dinan told me it was a leak by the rear turbo, Alekshop in Fremont told me it might be that, but the subframe needed to be dropped to look and be sure. I was hoping to go to another shop to get a 3rd opinion, but I don't know of many in the area besides the two.
If this has ever happened to anyone, I would appreciate any advice on the subject. I look forward to your replies.

Thanks

[888Concept]

At the rate of having to refill coolant so often, you obviously have a bad leak somewhere. It should be easy for a mechanic to figure out where the leak is and fix the problem at its root. You should've fixed it the moment the leakage problem started. Good luck!

[Spacecpe]

How many miles on the car ? it might your water pump .. mine had a hairline crack which got bigger with time and i had to fill coolant everyday lol.

[Debacle of Mass Eruption.]

Originally Posted by 888Concept

At the rate of having to refill coolant so often, you obviously have a bad leak somewhere. It should be easy for a mechanic to figure out where the leak is and fix the problem at its root. You should've fixed it the moment the leakage problem started. Good luck!

I would have fixed it then, but they were basically charging two months rent for a maybe solution, not really a sure thing.

[cwarren]

pump and t stat is right below the rear turbo i would pull under tray and drop the sway bar fill with water and look to see whats going on . has it thrown pump codes/over heated ?

[Debacle of Mass Eruption.]

Originally Posted by E90 M335i

How many miles on the car ? it might your water pump .. mine had a hairline crack which got bigger with time and i had to fill coolant everyday lol.

It has about 115k, i bought it a 109k
The leak is coming from the right, near the firewall

[Debacle of Mass Eruption.]

Originally Posted by cwarren

pump and t stat is right below the rear turbo i would pull under tray and drop the sway bar fill with water and look to see whats going on . has it thrown pump codes/over heated ?

No codes yet, only from a POS SSTT i bought on eBay that game me a limp light, it was quickly removed
It hasn't overheated from my knowledge, although it used to emit ALOT vapor from under the hood a couple months back after driving home from work. it hasn't done that in a while
I own a muscle car and i know vapor means a bad water pump or a cracked radiator, but i don't know enough about these BMWs to make an expert opinion.

[NiVeDh]

Here's what I'd try:

1. Pull the undertray.
2. Top up the reservoir with distilled water and run the coolant bleed cycle.
3. Get under the car during the cycle and look for leaks.

[blackturbo]

Check for a crack in the radiator
check for a crack in the water pump
check for a crack in tubes or reservoir

Your loosing alot of coolant and its costing you money buying more.
For me i had a cracked waterpump with your leaky symptoms.
Good luck and update us

[Debacle of Mass Eruption.]

i'm gonna try to go to FFTECH in Hayward, Cal to see if they can check it out. Any know of any other shops in the Bay Area?
(Shout out to my Canadian homies for the help too )

[Cloud9blue]

Any decent mechanics can do a pressure test on the coolant system to figure where irbid peaking.

[Jklad]

If your pissing that much coolant it shouldn't be hard to find. If you can't locate it yourself any decent tech should be able to do so quickly.

[chepy24]

Like everyone said find the leak (should be easy) and then go from there

[Peebody85]

I had that problem Friday night. Just a little vapor coming from the hood at the . It was a small leak in the expansion tank coolant line. Fixed it Saturday. Luckily it was right on top, but sounds like yours is coming from the rear.

I'd lift it up, start the car and wait till it warms up and water pump kicks on. See where it is dripping from and trace it back to the source. That way your not buying parts you don't need.

[soursamo]

Had the same issue, melted the resevoir hose in the wheel well

[Laurus_CEO]

Bring it over to me, I will find the leak and we will fix what's needed. Just last week I did radiator and hoses on an E90 to fix leaks as well as water pump on thermostat that died on my buddies E88. I'm in San Leandro and do a ton of work on N54 cars out of my garage.