After 26 years, it is time. - Mercedes-Benz Forum

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post #1 of 75 (permalink) Old 06-04-2017, 06:37 AM Thread Starter
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After 26 years, it is time.

Well I got in the C126 and the Texas heat was coming but the airflow inside the car was hot. From perfect the day before to nada! Removed and replaced Klima relay, no change. Hooked up a can and I was EMPTY, no refrigerant. 1 can in and compressor came on, 1/2 can and aux fan kicked in. Cold air back from auto-part store. Few hours later, fire up car and cool but not cold, I backup and breath the band-aid smell of 134a. Stop the car midway down the drive and there it is, worst nightmare! Dinner plate size gob of green fluid smelling like a case of bandaids. Go back and look at transmission and its dripping green condensate. So I either have O ring failure at the evaporator or failure in the core itself, not possible to get refrigerant out the drains, those items are sealed deep in the bowels of the airbox.

Dash removal, and replacement of Orings, expansion valve and new evaporator. While I am in there, replacing vacuum pods that I did not replace in 2012.
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1991 560SEC 199 /268, 17" RS90'S, Eibach springs, Bilstein HD shocks, Custom rear sway bar, Euro Headlights, Custom ceramic coated headers and down pipes with stainless dual exhaust, W140 glass sunroof, dog ear trunk spoiler, OEM Skid Plate, Euro bumpers.
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post #2 of 75 (permalink) Old 06-04-2017, 07:39 AM
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Oh boy... And just in time for the summer. I feel for ya, Louis.

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post #3 of 75 (permalink) Old 06-04-2017, 08:03 AM
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Got a vacuum pump?

Pull a vacuum and see how long it will hold it. If it will hold a vacuum longer than about 30 minutes you might be able to seal it with this stuff:

https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1

I had a 95 S500 coupe that the evaporator started to leak on, and this stuff kept it going for another year.

Dan
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post #4 of 75 (permalink) Old 06-04-2017, 08:12 AM
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our cars are old - these things are inevitable at this point
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post #5 of 75 (permalink) Old 06-04-2017, 08:15 AM
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That sucks, Louis.
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post #6 of 75 (permalink) Old 06-04-2017, 09:38 AM
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I can attest to the stuff LWB250 posted - that fixed an evaporating leak on my former E320 to the point it still works several years later (friend owns it now).
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post #7 of 75 (permalink) Old 06-04-2017, 10:49 AM Thread Starter
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After 26 years, it is time.

Thanks Dan! I didn't state that I used a similar product but the results after 10 mins of refill were the same

This will be a one and done for all things under the dash, and will review heater core as well.


_____________________________________________
1991 560SEC 199 /268, 17" RS90'S, Eibach springs, Bilstein HD shocks, Custom rear sway bar, Euro Headlights, Custom ceramic coated headers and down pipes with stainless dual exhaust, W140 glass sunroof, dog ear trunk spoiler, OEM Skid Plate, Euro bumpers.
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post #8 of 75 (permalink) Old 06-04-2017, 01:19 PM
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I don't EEVEN wanna think about what you have to look forward to, tearing out the dash to get to what needs to be taken care of but like you said Louis, do it all while you're in there and it's apart
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Some days it's just not worth chewing through the restraints
My Stable:
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Dif-tor heh smusma I'm surprised that NOBODY has asked me what this is / means LOL
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post #9 of 75 (permalink) Old 06-04-2017, 01:45 PM
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Quote:
Originally Posted by 281lxm View Post
Go back and look at transmission and its dripping green condensate. So I either have O ring failure at the evaporator or failure in the core itself, not possible to get refrigerant out the drains, those items are sealed deep in the bowels of the airbox.
Oh man, what a job you have in store..

I agree with you that the evaporator core is bad now.. As the High & Low side connections to the Evaporator [o-rings] are external to the HVAC box.. that green mess would be all over your right foot and into the carpets were they leaking.. Yuck!

In addition to the previous advice and consolation, I'd recommend getting the HVAC door & linkage kit from MB [#23] in the pic.. 0008301233

https://www.ecstuning.com/b-genuine-...er/0008301233/

As you can see, its got a whole bunch of tiny bell cranks & HVAC gizmatrons that I see get brittle over time, snap.. then render some vital little thing inside the box inoperative.... For example, I've read it many times that the drivers side: no heat... = broken linkage to the left 'floor door'. You might consider those flap doors, numbers 35 & 38 on the picture..

An idea anyways.

MBL
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post #10 of 75 (permalink) Old 06-04-2017, 02:38 PM Thread Starter
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I verified availability of such things while running thru the parts list.


_____________________________________________
1991 560SEC 199 /268, 17" RS90'S, Eibach springs, Bilstein HD shocks, Custom rear sway bar, Euro Headlights, Custom ceramic coated headers and down pipes with stainless dual exhaust, W140 glass sunroof, dog ear trunk spoiler, OEM Skid Plate, Euro bumpers.
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