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Old 07-03-2020, 07:22 PM   #1
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2001 31' Land Yacht
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dash air/engine processor LY30 2001

still no air!! put on a set of gauges to confirm system was charged. gauges read a static pressure of around 110 on the low and high side. I think this is in the ball park, since today was around 90 degrees. since the clutch does not engage, the pressure doesn't change when engine is running. found an electrical wiring diagram in the manual, of course the wire colors don't match what is actually on the MH! anyway, found the location of most of the air conditioning parts. with the key switch in the IGN "on" position and the air conditioning selector switch on "max air", I traced the 12v to the thermostat, low and high pressure switches. all seem to be working. the output of the high pressure switch, according to the wiring diagram, goes directly to the a/c clutch, and engine processor. the a/c clutch connector does not have 12v. I applied 12v directly to the a/c clutch, and the clutch engages. I assume the 12v to the engine processor is to signal the engine processor to increase engine speed due to the clutch being engaged. my question is, does the engine processor also send 12v to the a/c clutch on a different wire? does anyone have a ideal where the engine processor is located?
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Old 07-03-2020, 07:44 PM   #2
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Good news you have good offline pressure. Leaks are so much worse than mechanical or electrical issues. Also great that the clutch is fine as that is not much fun replacing either. Generally the engine processor does not so much activate the a/c but it does cut it off if the throttle position etc. calls for max output. If your description is accurate, it does sound like the processor cut-out circuit is the issue. i would first look at a fuse or relay as the issue since computers don't have anything capable of the higher current required to pull in a mechanical clutch...
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Old 07-04-2020, 05:54 AM   #3
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The power feed from the AC clutch should come from a relay which also powers the electric fans in front of the AC condenser. Regards, Bob
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Old 07-04-2020, 10:56 AM   #4
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have any ideal where the a/c relay would be located?
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Old 07-04-2020, 10:58 AM   #5
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any ideal where the a/c relay is located?
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Old 07-04-2020, 09:58 PM   #6
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usually in the main fuse box in the engine compartment. I am not familiar with your set=up so I can't be sure.
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Old 07-05-2020, 05:41 AM   #7
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Not on your motor home, but usually if you follow the power feed from the AC clutch or the electric fans in front of the AC condenser you will find it. I would think it would be around the radiator vertical support right (passenger) side. Regards; Bob
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