Dear all, My car is BMW2000 323i. My coolant is leaking, I need to refill it every month. The dealer told me I need to change the radiator and some related components in the coolant system. But the labor fee is too high. I was told to use a coolant seal to fix the problem like K-Seal. After a long…

Did the dealer show you the leak?

BMWs are expensive to maintain and repair! The dealer should at least been able to show you where the coolant was leaking out. For minor leaks these sealant often work; if you have to add a significant amount each month, it probably won’t. You need to get a second opinion from a radiator shop as t…

I’m not an advocate of sealing additives for coolant leaks except to squeeze and extra 6 months out of a beater on its last legs. That’s not the case here. I’m with Doc… someone needs to look at the cooling system and see exactly where the problems are. A dealer will always cost more… a BMW dealer…

OP: sometimes the sealant works too well and clogs up other things. Stay away from it and get it fixed properly, replace those parts which need replacing and don’t screw around with a leaky cooling system, you’ll overheat the engine and have a major bill on your hands. Rocketman

While I have used sealers many years ago and they worked well I would have to agree with @rocketman .The material can collect in the pin bores of thermostats and cause them to stick. Also, todays radiators have narrower passages which also would have a greater tendency to become clogged.

Take a tablespoon of ground black pepper and add it to the coolant. I once had a Beretta with an external head gasket leak and adding the black pepper to the coolant stopped the leak for a year. I keep a can of the stuff in the shop just for that purpose. Tester

I will add another vote for not using sealer. I have seen too many cars where the sealer caused more problems, often times it was the result of adding more than instructed. Look for a second opinion, you may be able to find a radiator shop that can repair the radiator.

As others have said, find a good independent shop, get a non-BMW radiator. They’re $150 or so at Rockauto.

Seems as the expansion tank is a high failure item and easy to replace. http://www.bimmerforums.com/forum/showthread.php?1367876-Severe-Coolant-Leak-2000-323i

@egeh Replace the leaking radiator and whatever else is leaking Stop leak MIGHT temporarily fix a very small pinhole in the radiator . . . or not Stop leak will not fix a split o-ring or a crumbling intake gasket, causing coolant to pour into the crankcase It appears your car is 14 years old. …

Does the Coolant Seal work or Not?

Maintenance/Repairs

egeh December 2, 2014, 8:11am 15

Thank you guys.

I decide to replace the hose and radiator soon. And NEVER use coolant seal.

Egeh.

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Does the Coolant Seal work or Not?

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