A/C Evaporator core problem??? - Mercedes-Benz Forum

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post #1 of 7 (permalink) Old 07-07-2005, 06:59 AM Thread Starter
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A/C Evaporator core problem???

I was told that I have a leak in the evaporator core on my 95 s420. The shop told me that it was a pretty expensive job. I will cool ok for a couple of weeks when I re-charge it so the leak does not seem to be that bad. Has anyone tried to use any type of A/C stop leak or is this not recommended?
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post #2 of 7 (permalink) Old 07-07-2005, 12:46 PM
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RE: A/C Evaporator core problem???

Welcome to the forum!

I've never even seen a stop leak for an A/C system and if there was one I'd be more concerned about it blocking stuff it wasn't supposed to, damaging the compressor, etc.

At any rate, I definitely wouldn't be venting that stuff all the time though, it's nothing you want to be breathing and cost is no reason to pollute the atmosphere with refrigerant. You could source a used one from a salvage yard and change it yourself, then just have it evacuated and recharged and save most of the expense.

Good luck and enjoy the ride,
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post #3 of 7 (permalink) Old 07-07-2005, 09:46 PM
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post #4 of 7 (permalink) Old 07-09-2005, 02:29 PM
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RE: A/C Evaporator core problem???

Stop leaks dop no good to A/C systems. They ultimately cause more problems that will run you greater expense!

Bite the bulli and get the evaporator replaced.

Find a good M-B repair shop. Forget the dealer!
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post #5 of 7 (permalink) Old 07-10-2005, 06:43 AM
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RE: A/C Evaporator core problem???

Unfortunately a common problem with the Behr evaporators. Its a 20+ hour job to do (gotta take the dash and console appart completley. Figure $3000+/-.

There ARE 'stop-leaks' that do work most of the time, and if the leak really is in the evaporator, chances are good the stop leak will work
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post #6 of 7 (permalink) Old 07-12-2005, 04:23 PM
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RE: A/C Evaporator core problem???

The mid 90's MB's are notorious for being expensive to dig out the evaporator coil, and being an early model aluminum unit -- susceptable to corrosion and failure.

It is buried deep and the dash, HVAC and ducting all needs to be torn out[:(!]

The dealer quote will cause many an MB to be totalled before their time.

Go easy on a recommendation of a stop-leak. You could do more damage to the rest of the A/C system. The sensors and drier come to mind.

I would shop independent MB shops for a mechanic that needs the work and has done it before. That will be the cheapest and safest way.

Good Luck


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post #7 of 7 (permalink) Old 07-12-2005, 04:33 PM
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RE: A/C Evaporator core problem???

MJ has given good advice.

The expansion valve is the opening through which freon passes under high pressure. The rapid expandsion through this valve causes the freon to quickly cool and thus cool the car.

That's a mighty tiny opening, and the stop leak will ultimately plug that opening.

Net result is even more cost.

Evaluate what you have $ wise into the vehicle and decide if the repair is of value to keeping the car a few more years.

If it's a good car and runs well, the investment in the evaporator replacement may turn into a good deal.
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