Question about 2003 BMW 325

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Wire running from compressor to on /off switch is lose on my 2003 325i wihich in turn vibrates and dose not let clutch ingage

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Ok, not sure what your question is, but if the wire is loose you need to secure it for sure.

Posted on Jul 31, 2013


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Posted on Jan 02, 2017

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SOURCE: Drive train on 1997 Z3

sound like your clutch disc ran out you need to change you clutch.

Posted on Mar 17, 2009

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Have a 95 grand jeep chrokee limited 5.2 liter pcm will not ingauge AC clutch relay

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run a wire from the + battery cable to the compressor pulley switch with the engine running, ac on if the compressor clucth engages (turns) you have low refrigerant charge


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Dear Friends, I have 2003 Lancer GLXI , I have a problem mention below When Engine and AC are started there is a vibrating noise of the bonnet. One local mechanic said its ECM problem. Car does not...

ECM - electronic control module? Maybe, but there are other issues to be checked first.

You AC is clearly not functioning.

The vibration when the AC is on may be the AC belt idler pulley, or perhaps the compressor clutch.
This is easily checked. The belt can be loosened, and the idler pulley checked for free rotation. At the same time, (engine off) the compressor pulley should be easily rotated. The compressor clutch is controlled by the thick single wire that runs to the compressor. Locate the connector to the main wiring loom and disconnect it.

Run a wire from the battery to the clutch wire. You should hear a load click as the compressor clutch engages. You should be able to rotate the compressor pulley, but there will be a significant load resistance. If the compressor seems jammed, then I'd suspect it has a serious problem.

There's a High pressure A/C valve some where near the front of the car. The cap is probably light blue. Press the valve inside momentarily. If you hear a loud psssttt, the AC pressure is probably OK. If you get a soft sssss sound, you've lost pressure. The usual reason is age or pin holes in the condensor in front of the radiator.


Jun 25, 2011 | 2003 Mitsubishi Lancer

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Air conditioning compressor pump clutch not ingaging

sounds like you are low on freon, that would be the fist place to go. the system has a low pressure switch that when the freon gets low it will not allow the compressor clutch to engage.

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To add 134a, which of three wires on the pressure switch should I jump to get the compressor to run to add freon?

you don't need to jump the wires. even if the compressor clutch is not turning add the refrigerant to the low side port, it will go in through its own pressure when a safe level for the compressor to run has been reached the clutch will engage. at first the clutch will spin a second or two and stop and then begin again, from there continue adding refrigerant the clutch should spin continuously. if the clutch fails to ever engage the compressor is bad or there is a wiring problem.

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Ac compressor not starting. added one can of 134R and no help. had a rebuild last year of the engine and has not worked since. Thinking it might be a wire some where.

Check for voltage at the AC clutch with AC on and engine running. If no voltage there, check voltage at AC clutch cycling switch.

Aug 13, 2010 | 1997 Ford Expedition

1 Answer

Ford 2006 Crown Victoria - blows hot air no AC or cool vent - just hot air.

Before you start your engine look at the A/C clutch. If you want, put a mark on it with chalk or paint.
Start your car and turn on the A/C, then look under the hood and see if the A/C clutch is turning. It may cycle and try to work. If it does not there is a switch close to the black cylinder where the A/C lines run.

This is the low pressure side of the system. If you remove the connection and put a "U" shaped wire into the harness it will arc and engage the compressor while the engine runs. Do not plug this in with the engine off. If the compressor clutch works then your problem is low pressure or a bad low pressure swtch. If the compressor clutch does not work it is very likely the bad part or you blew a fuse.

If the compressor turns and sounds like a stone crusher your compressor is bad. Now if you have determined the compressor is good, the clutch is good,the fuse is good, you have to diagnose the low pressure.

You will need a gauge. Some cans come with them but they are not always reusable. If you add 1 can of Freon and use the "U" shaped wire where I told you, it will draw in enough to start the refill without the "U" shaped wire. You still need to measure the pressure so you do not overfill the unit. A completely empty system will take about 3 cans.

You can lose the Freon through a leak, there are leakstop chemicals for A/Cs. You may get assistance from Autozone or Oreillys on this matter. Freon usually lasts for years. I have replaced many low pressure switches and had immediate success where it was the ONLY problem.

Nov 16, 2009 | 2006 Ford Crown Victoria

1 Answer

The ac clutch will not ingage the two wires that go to ac clutch never have 12 volts on eather one

You need to have it leak tested and recharged. There's a low pressure switch that won't alow the compressor clutch to engage when there's a leak. If the compressor clutch was engaged without refrigerant and oil circulating it would seize. Don't be surprised if you need a new condenser. Don't use those leak sealer recharge kits as they can do more harm than good, and some AC shops won't touch a car after someone uses leak sealer. They claim there's a different mix of gases in the refrigerant (usually propane) and they can't recycle it, and they don't like customers complaining when the AC doesn't work when it was the leak sealer clogging things up.

Aug 18, 2009 | 1997 Dodge Grand Caravan

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Drive train on 1997 Z3

sound like your clutch disc ran out you need to change you clutch.

Mar 01, 2009 | 2001 BMW Z3

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