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UberRoo,
There was some limited experience with duty solenoid A/C failures
on this site. What we've seen that solenoids wear out internal valves - the electrical resistance remains the same, they still make
clicking sounds and they *seem* to open and close fluid passage properly when tested with compressed air. However once installed in the car, the combination of fluid pressure and any duty signal from TCU (even 10% duty is enough), they will open fully and remain open all the time.
The only test that works is the ATF pressure test. There is a test port in the extension housing that provides transfer line pressure.
In your particular case the other possible culprit is the transfer clutch. If you want to test it, you need to plug an ATF pressure gauge to the test port see if you have pressure and if it behaves properly with throttle changes. However the fastest (and the best long term) solution is simply to replace both the solenoid and the transfer clutch plates.
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