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Old 06-14-2013, 11:17 PM   #1
agartthean
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Default 2000 LS2 AC wiring diagram

Hi everyone, I'm looking for a good wiring diagram of the AC system, that includes the wire colors. On my friend's 2000 LS2 the AC compressor does not turn on anymore, even though the pressure in the AC system is up to specs. I wanted to find out if the clutch has gone bad or where the problem is otherwise, but there are 2 wires instead of 1 going to the clutch, and also elsewhere 3 wires where i expect 2 etc. Now i don't know where to apply voltage to without damaging something else. The wiring diagrams on autozone's website did not help since they don't have wire colors nor even the correct number of wires. Can anyone help? Thanks a lot in advance.

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Old 06-14-2013, 11:58 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: 2000 LS2 AC wiring diagram

1-Any pressure reading done with a/c off is useless information. Ask yourself, do you use the a/c when its OFF or when its ON? ON is when pressures are read and with certain models, engine rpm must be @2k to assess pressures on low and high side.

2-With two wires to the compressor connector, simply run 12v to either wire on the compressor as the second wire is grounded to the engine block. The coil for some compressors are grounded to the compressor with only one wire connection as the power input. Others like yours doesn't connect directly to the compressor body and run a second wire to the connector to ground somewhere else on the engine block. You can safely power any wire with 12v and ground the other connector.

If 12v power results in a loud click with the clutch engaging then the coil is fine. No click heard or clutch engagement means the thermal fuse blew and either compressor or coil replacement is necessary. Unless you know how to source compressor parts, replacing the compressor is likely.

3-Successfully powering the clutch means the a/c system probably leaked refrigerant and the pressure sensor detected the lowered pressure, too low to operate the compressor by sending a disable signal to the ecm to prevent compressor operation. 98% of all a/c issues are LEAK related. The L-series use a three wire pressure transducer and cannot be bypassed as easily as the two-wire sensors. Saturns have dye and using a uv light shined on a/c parts can reveal the source of the leak to help determine where repairs are needed.

Be forewarned; do not use any sealer unless you're willing to compound the problem with a higher repair bill when sealer fails. And it will, period. Find and fix the leak first. This applies to any car.

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Old 06-15-2013, 01:28 AM   #3
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Default Re: 2000 LS2 AC wiring diagram

Thanks, fdryer, for the explanation of the compressor wires. Will get to work on this sometime soon.

I read that on the 2000 LS2 it is near impossible to change the clutch on the compressor, without removing the compressor (and discharging the system). Is that true? I have done this once on another car. And if its only the thermal switch though, can this be changed?

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Old 06-15-2013, 04:10 AM   #4
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Default Re: 2000 LS2 AC wiring diagram

Thermal fuse. Whether its epoxied into the coil or not is anyone's guess. When a thermal fuse blows, there's usually a reason as they don't fail. Coils outlast cars in normal service with few failures, caused by factors outside of normal conditions. The only purpose of using a thermal fuse that's buried into a coil assembly is to ensure protection of external wiring powering it.

Since you have experience with a compressor clutch coil procedure then you realize the difficulty attempting repairs without proper tools. Compressor failure for any reason is a major repair of an a/c system not to be taken lightly.

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Old 06-17-2013, 06:36 PM   #5
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Default Re: 2000 LS2 AC wiring diagram

I have access to alldata, AND Im having issues with my AC. The manual says if the resistance between the two AC clutch leads is greater than 3 ohms, then the clutch is fried.

Anyone know if you can buy just the clutch somewhere, or can give me a part number???

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Old 06-17-2013, 07:03 PM   #6
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Default Re: 2000 LS2 AC wiring diagram

For clarification and to be less confusing, a resistance reading higher than specified wouldn't necessarily mean a "fried clutch". Electrically speaking, an open reading of resistance, the display showing 'OL', not 0.00 or 0.01 is interpreted as a blown coil or thermal fuse. Coils have about 3 ohms of resistance. A blown thermal fuse in series with a coil simply won't show any resistance displayed, 'OL', an open circuit.

Its not easy at all to replace a the clutch plate and coil despite some here stating so. Each compressor presents its own problems. You can try http://parts.nalleygmc.com/, GMparts online, Google, etc..

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