Question about Mercedes-Benz 420-Series

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I have a 1995 S420 U.S model, I am the first and only owner. the car only has 20,000 original miles. no accident or even a dint or scratch on the car,maintained regularly. never had any problem . The air cond just failed last week, I took it to a Firestone station as I know the owner, he changed the Dry Bottle and the High Pressure hoses and some valves and clamps, refill the cooling agent, one day later , no air cond again. he filled it up again and failed again. I was told that it is very possible that there is a leak in the "evaporetor" which is inside the dashboardand, too troublesome for him to do the check and replacing job, as the whole dash needs to be removed and he does not have the hands to do it, is it ture ? ( surely I have a refund for the money I paid him less the cost of the parts which is under 200.)is there any shop specialized in Air Cond who can do the job and how much could it cost ? I live in Diamond Bar, CA 91765. Any suggestion ?

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  • osman_wei Dec 11, 2008

    Thank you for your information. I have just had an conversation with another friend who is an mechanic works for Toyota dealer, he basically said the same thing, however, I will have to take the car to him and leave the car there and give him the time to test. I am considering to do so.

    Thanks again.



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Di he put a tracer dye,usualy green,in when he recharged the aircon?It will usualy show a leak pretty quick,You may have a pressure safety switch thats faulty,usualy screwed into the aircon pump on the high pressure side and if it senses a low pressure problem it shuts the air con down to protect itself.It will have two wires running to it and joining the two wires will reactivate the aircon.Not advisable to leave wired up in this way as the air con charge also lubricates the pump and running it dry will require pump replacement if left running too long.Cant help with air con specialist as im in australia Good luck

Posted on Dec 11, 2008


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Tune up

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You can wait until about 75000 miles to do your timing belt.

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