The car is Civic Vti 97 manual.

The compressor clutch engages intermittently. I put a tester at the input of the clutch and verified that the power to the clutch is also intermittent. Tried to put the radiator fan relay (same as the AC clutch relay) on the fuse box and the problem still persist.

So the unverified source could be the A/C pressure switch, thermostat, ECU or clogged lines (results to high pressure). But what puzzles me is the abrupt and intermittent clutch engaging.

I would just like to solicit some tsikoteers to share their experiences regarding the same problem in order for me to know the most probable cause of my problem at least based on probability.

Thanks.