E420 A/C not working - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 06-06-2004, 11:48 AM Thread Starter
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E420 A/C not working

My A/C not working.. assuming that my freon is low, where to look for my freon level indicator ? hopefully that is the problem, how do i add R 134a freon to it.
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post #2 of 4 (permalink) Old 06-08-2004, 12:00 PM
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RE: E420 A/C not working

first, attach gauges. This is the safest way to determine whether there is a leak or not. After determining that it is low on refrigerant, inject a dye to look for the potential leak area. Remember, if it leaked refrigerant, it leaked oil as well. Boosting the system fo only refrigerant is not a good practice. This will eventually leak enough oil that the system will lock up and essentially lead to compressor failure. The best thing is to buy a set of gauges and dye injector-start from there. Hope this helps

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post #3 of 4 (permalink) Old 06-08-2004, 02:38 PM Thread Starter
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RE: E420 A/C not working

I found that there is no freon left on the system, so I did as u described.. adding freon with dye.. and found that there is no visual leak so far or so.. but i found that there is no power going to the air compressor. Is these problem related

do u have any solutions...
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post #4 of 4 (permalink) Old 06-08-2004, 03:11 PM
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RE: E420 A/C not working

If The Compressor is NOT running you Will NOT see any freon in the sight glass in the dryer.

I Would trouble shoot the system before adding any freon..Do a Search re the A/C Push Buttons
There is a Great source of Info from the push button assy

I Would say its the A/C Evap temp sensor...Done SEVERAL
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