A/C no longer blowing cold air - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 4 Weeks Ago
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A/C no longer blowing cold air

Four summers ago I recharged my a/c and everything were back to normal. This morning I charge a new can but my a/c compressor clutch won't engage? Is there a fuse, relay or module that I can check to see what's going on?
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#2 Old 4 Weeks Ago
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You may need to get any error codes reset,

That often sorts it out.
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#3 Old 3 Weeks Ago
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Originally Posted by hasontour View Post
You may need to get any error codes reset,

That often sorts it out.
Error codes reset? I'm not sure what do you mean by that.
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#4 Old 3 Weeks Ago
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If the system is too low on freon then the compressor will not come on. Do you have a set of gauges for charging the system.
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If the system is too low on freon then the compressor will not come on. Do you have a set of gauges for charging the system.
Just the gauge that come the freon set up, it took the whole can. How do jump or check to see before determine the clutch or the compressor is bad.
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Do you know how to use a gauge set. If so you can go to Autozone and get a loan a tool and put the high side on the high and the low on the low and see what the reading is. The engine does not have to be running for this check. The low side should be just under 40 and the high side around what every the outside temp is when you check it. I suspect you have a larger leak than you think. The only way to find out is also get a loaner vacuum pump and pull the system down and see if it hold a vacuum. This needs to be done for at lease 30 minutes then close the gauge valve off at the pump. If the gauges rise from the 28/30 reading of vacuum then you have a leak and you must find it before you go any further. If it holds vacuum then you can service the system. Post back and will give you direction how to do. You should not see any oil spots on any fitting on the A/c system. Check the compressor also on the belt end.
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