Any ideas on trouble shooting priorities? Which fuses?

Fan and all other controls appear to function.

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Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
92 300D 2.5 Turbo
92 300TE 4Matic

First thing I would do is check the fuse under the hood. Next I would get a length of wire and try to jump the compressor to see if it will engage with power. If it engages with power I would have the freon checked. It may have leaked out.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R

Directly above the compressor there is a pressure switch. It stops the compressor from running if you run out of refrigerant. You can short the plug temporarily to see if the fan clutch kicks in but do not run it like that for long.

I just ran a diagnostic - jumping the low pressure cut off switch. Sure enough the clutch jumped right on. I left it running for a minute or so to see if I was getting cold air from the center dash blowers - none. Would may analysis be correct if I assumed that I was low on pressure and that the low pressure cut off switch was not the problem?

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Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
92 300D 2.5 Turbo
92 300TE 4Matic

basically, yes.

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.

So basically I've been looking through the web at leak detection kits - averaging about $50-75 for kits that test between 2 to 10 systems. Any thoughts on those? I have also been looking at just getting myself Section 609 certified. Doesn't seem that hard - study, take a test, . . . I suppose with four cars it might just pay off in the long run (you know, typical make versus but analysis).

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Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
92 300D 2.5 Turbo
92 300TE 4Matic

I downloaded a copy of the study guide from www.epatest.com or something like that. Looks pretty easy and some good info. helped clarify a few things for me. I might take the test soon and try to get my A/C charged up. I can live without it here, but sure would be nice to have.

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.

So let me see if I have this straight.

Pull the connector off of this switch, short across two terminals inside the connector, if the clutch kicks in, the pressure is low, get the system charged. If it doesn't kick in and you have already verified the fuse is good and everything else on your ACC seems to be working....what next?

Thanks in advance for your help...it's getting really hot here in Texas about now!

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1998 W202 C230 - The money pit of late.
1984 W126 300SD (356,800 miles) Gone to the wrenchapart
1984 W123 300D Gone to the wrenchapart
1972 W108 280SE 3.5 (sold but not forgotten)
1986 Buick Grand National 3.8l Turbo (86k miles)
1966 Glassic Model 'A' Replica http://www.glassicannex.org

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Just make sure you have the a/c on full blast when trying it.

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Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
92 300D 2.5 Turbo
92 300TE 4Matic

You need to determine if you are getting 12+ to the pressure switch. If not, suspect the E.T.R. switch (located on the evaporator). Check for 12+ at the E.T.R. next. If no 12+ at the E.T.R., the next component up stream is the CCU. Good luck.

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1984 300SD 326,997 miles and counting . . . No wait, my odometer is still dead

Thanks for the help...hopefully I will be able to tackle this over the weekend....just as soon as I do a power steering rebuild....tired of all that oil over everything...

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1998 W202 C230 - The money pit of late.
1984 W126 300SD (356,800 miles) Gone to the wrenchapart
1984 W123 300D Gone to the wrenchapart
1972 W108 280SE 3.5 (sold but not forgotten)
1986 Buick Grand National 3.8l Turbo (86k miles)
1966 Glassic Model 'A' Replica http://www.glassicannex.org

http://banners.wunderground.com/weat...Round_Rock.gif

Don't short the low pressure switch connector with the engine running. Short it with ignition on, engine off and then listen for the clutch to click. This way you won't do any damage to the compressor and accomplish the same test.

Good luck,

I trust the minute or so I did it with the engine running was not fatal to it.

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Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
92 300D 2.5 Turbo
92 300TE 4Matic

Probably not fatal, but it didn't do anything that will extend the life of the compressor.

Good luck,