[ychachad]

Is this the dreaded evaporator problem on the 1995 MS S420? Is there a quick fix, and approximately how much does it cost to fix the A/C? Is there a reset button somewhere? I recently replaced the battery, would that do something funny? Thanks in advance.
Y. Chachad

 

[Peter Guenther]

AC

I hope it is not the "condenser" the cost for that is 1500 to 3000 depending on how your dealer works with the zone rep on "factory assistance". It is called dash out, they replaced all kinds of other things like dryer and sensors.
The good news is there are sensors that keep the compressor system from starting, there are other items. if it just lost the charge maybe there is a small leak. It needs to be checked by someone competent, there is a diagnostic mode, maybe someone out there remembers the posting of it

 

[starscream]

I hope it is not the "condenser" the cost for that is 1500 to 3000 depending on how your dealer works with the zone rep on "factory assistance". It is called dash out, they replaced all kinds of other things like dryer and sensors.
The good news is there are sensors that keep the compressor system from starting, there are other items. if it just lost the charge maybe there is a small leak. It needs to be checked by someone competent, there is a diagnostic mode, maybe someone out there remembers the posting of it

did you mean the evaporator?

The condeser just cost $200.

 

[bass1175]

This is just some of the stuff I would do with the limited tools I have. I would check to see if theres any kind of presure on the low side, by taking the cap off the fitting ( where you put freon) and pressing on the valve to see if any freon is released. If its not fully empty I would try putting in another can and see if that engages the compressor. Which is another question, does the compressor engage when you turn on the ac, check that by having someone turning it on and off while you stand under the hood to see if the compressor is engaging. your probably just low on a can of freon. you can also enter the ac sensor value mode and check your pressure without lifting the hood at all, refer to the knowledge base for that, you can also check for codes in the ac diagnostic mode. I would add a can in and see if that engages the compressor.

 

[AlexanderZwo]

Your tools aren't limited at all. You have a complete On Board Diagnosis for the A/C. Read more about it in the Knowledge Database.

Best regards
Hubert

 

[eric242340]

Your tools aren't limited at all. You have a complete On Board Diagnosis for the A/C. Read more about it in the Knowledge Database.

Best regards
Hubert

Hubert, you are boringly accurate lol. But it does look like the Evaporator is leaking (to me anyway)

 

[AlexanderZwo]

Hubert, you are boringly accurate lol. But it does look like the Evaporator is leaking (to me anyway)

You got it, man, but let me tell you a story:

Friend of mine thought his W140 evaporator was leaking because we always think the evaporator is leaking. So he went to an A/C specialist, who found out that the original caps of the A/C service valves had been replaced by differnet ones.

The original caps have a gasket inside, which tightly closes the valve, not only to protect it but to firmly close it. Replaced them with the original caps and his evaporator was "fine" again.

That's why I so strongly insist with pushing the few buttons and carefully examining what is going on...

Best regards
Hubert