New A/C on a 300E??
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Joined: Jun 2002
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New A/C on a 300E??
I have an '89 300e. My A/C doesn't work, spits out hot air. The freeon thing is full. I think I need a new compressor... anyone know how much those are and how much it is to install??? Anyone know a great place to get em cheap??? Thanks!
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Joined: Jun 2002
Posts: 14
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From: Houston, tx
1992 300E
A/C
Chupper,
I have a 1992 300E that used blow hot air all the time. MB dealer gave me a $4200 bill. Took it to a local mechanic checked for leaks-none found. Filled it with 3 cans of freon. Still no cold air. Until MBDOC mercedes mechanic told me my problem was the ACC Mono Valve. Changed it and now no more hot air. The part is cheaper and less labor than compressor. Check that out before you go get a whole new system. Hope that helps you.
I have a 1992 300E that used blow hot air all the time. MB dealer gave me a $4200 bill. Took it to a local mechanic checked for leaks-none found. Filled it with 3 cans of freon. Still no cold air. Until MBDOC mercedes mechanic told me my problem was the ACC Mono Valve. Changed it and now no more hot air. The part is cheaper and less labor than compressor. Check that out before you go get a whole new system. Hope that helps you.
Member
Joined: Feb 2002
Posts: 136
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From: Massachusetts
Mercedes-Benz 300D TURBO 1987
New Compressor?
Test your system by having a competent technician put fluorescein dye into it and exposing it to ultraviolet light to reveal where and what is leaking. If you need a compressor, call Rusty at Wholesale Parts in Atlanta at 800-741-5252 and ask him about his rebuilt (in Germany) compressors. If you need a compressor, condensor, etc. convert to R134a (cheap) and tell Rusty you are doing this so he will send the correct type of compressor. You will need to order a new receiver/drier (cheap) also for the new refrigerant. P.
Member
Joined: Jun 2002
Posts: 237
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From: Charleston, SC
99 ML 320, 97 Porsche 993 C2S, 92 300E
Could be the MAS relay
Chupper,
I had that problem and it turned out to be a the MAS relay, it's located behind the battery and has a black plastic cover which is easily removed to gain access. It's part number 011 545 79 32.
Ron
I had that problem and it turned out to be a the MAS relay, it's located behind the battery and has a black plastic cover which is easily removed to gain access. It's part number 011 545 79 32.
Ron
Senior Member
Joined: Jun 2003
Posts: 302
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From: Salem, OR
08 Lexus GS350 AWD. 08 Lexus RX350 AWD - wife's. 94 MBZ E320 - still have it.
Why compressor? Those older W124s (I used to have '86) were known for the climate control unit failures. That's the push-button thing above the stereo. I had to replace mine. But before doing that, I would hot-wire the electric clutch of the compressor with the engine running and the AC on. If it kicks in and starts blowing cold air after you hot-wired it, then yor compressor is OK, as well as the expansion valve.
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Joined: Aug 2002
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From: Germany
'00 S320 W220, '98 A160 W168/ sold in 2005 '86 260 E W124 '90 260E W124
If you convert R12 to R134a you need to swap the dryer bottle, the pressure switches on top of the bottle and the compressor oil from mineral oil to esther-based oil. That's all if the other components are ok.
Originally posted by Holson
If I were to convert a pre-134A w124 car, I would definitely upgrade the condensor and the aux.fans to the R134 items.
If I were to convert a pre-134A w124 car, I would definitely upgrade the condensor and the aux.fans to the R134 items.
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MBWorld Fanatic!
Joined: Aug 2002
Posts: 1,005
Likes: 32
From: Germany
'00 S320 W220, '98 A160 W168/ sold in 2005 '86 260 E W124 '90 260E W124
There are a lot of areas of possible causes of failure already discussed. I had another one to add. Check the "KLIMA" relay behind the battery,if the A/C compressor does not kick in, when "hard wired" as proposed. Open the relay and check the printed board circuit path. If one is burnt, you may have the following problem. The wire energizing the clutch of the compressor may be corroded, and or the insulation damaged, and draw to much current, burning the conductor path in the relay. I had this and it cost me a new KLIMA relay, since it burns it in an instand, if the wire down at the electric compressor clutch is not fixed. Just a thought. It's pretty hard to to that point w/o removing the compressor, but with patience and time it works.
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