CLK-Class (W208) 1998-2002: CLK 200, CLK 230K, CLK 320, CLK 430 [Coupes & Cabriolets]

High pressure

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Old Mar 24, 2026 | 07:13 PM
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2002 CLK 320
Question High pressure

Ok so I have a 2002 CLK320. Still drives good except when I cut the AC on it doesn't blow cool air. So I bought ez chill r-134a from walmart. I go to hook up the hose to the low pressure side and the gauge shows very high pressure meaning the gauge is almost to the end. Does anyone have any experience with this issue and know where I should start to troubleshoot this issue before summer gets here? TYIA
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Old Mar 24, 2026 | 10:17 PM
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W209, W124
Low pressure side will have high pressure if compressor not running. As in, the whole system will be at same pressure unless running.

In the olden days, (R12/22) we would just Hotwire the compressor. Not so easy now. Keep digging for procedure on your car and compressor. Gotta do it right
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Old Mar 25, 2026 | 04:31 AM
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2002 CLK 320
Originally Posted by MacVidMB-V8
Low pressure side will have high pressure if compressor not running. As in, the whole system will be at same pressure unless running.

In the olden days, (R12/22) we would just Hotwire the compressor. Not so easy now. Keep digging for procedure on your car and compressor. Gotta do it right
I have the ac on full blast as low as possible (set to lo) but it seems no matter how long it runs it never starts to get cold. Do I need to wait for the engine to heat up? Last summer I had no issue with it getting cold within a few minutes of it turning on.

When I was researching online it said something about a potential blockage in the system. How do I tell if my compressor is kicking on? Just trying to start at the cheapest route first lol.
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