AC not working on 2001 Mercury Villager

The clutch will not engage if the refrigerant charge is low. You will need to find where the leak is (may even be the compressor itself) by using leak detection dye, and you will need to recharge the system. MAKE SURE TO USE THE CORRECT RATIO OF PAG OIL TO REFRIGERANT WHEN YOU RECHARGE THE SYSTEM.

I passed this question the first time I read it, so I will take a stab at it now.
The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch.
I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ?
Speeding up the engine would increase voltage from the alternator.
This is assuming the serpentine belt is tight and everything else is working correctly.
I think I would swap the relay with another and put a meter on that circuit to the ac clutch to see what it takes to engage it.

I assume it's because your clutch is engaging and disengaging. Could be from a loose electrical plug to your compressor coil on the compressor. It could be a loose plug to the pressure sensor or a bad pressure sensor because that sensor will shut it off if the car is low on Freon causing low pressure in the system. Could be low on Freon so it's on the edge of having enough pressure to turn it on and then shuts it down again because it dips below the pressure threshold when the compressor kicks in. Could be a bad compressor coil that engages the clutch. Maybe a loose connector to the AC Button in the car or the AC Button is intermittent. Could be an intermittent relay engaging the compressor clutch. That's a good list of what all could cause it and if you end up needing to replace the compressor, I made a video on how I did it.

Replace the bearing or compressor

it's either low (in spite of your readings) or your a/c clutch is not working correctly or you have too big an air gap in the clutch.
First, just disconnect the 2 pin connector from the a/c pressure cycling swithc and jumper the 2 pins with a wire to force the clutch to stay engaged. See if it blows cold then, and stays engaged. You can run this way for about 15 minutes before you have to pull the plug.
report reulsts.

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your ac compressor clutch is bad and needs to be replaced and honestly it usally better to just replace the entire compressor


if it helps could you leave me feedback please thanks

Your compressor clutch is not engaged that was why AC is not on. The clutch is controlled by several sensors: coolant temp, refrigerant pressure, compressor speed sensor, evaporator temp sensor... First to make sure your Clutch is working then start tracing back to these other sensors. Look at the compressor, there is a plug of electrical wire on it. One prong is for speed sensor feedback, the others are for power connectors to turn on the clutch. Jump wires to power to clutch to check if it is working. That is just the beginning of AC troubleshooting. Good luck.

if refrigerating system low in presure(low refrigerator level)presure sensor wil not send signal to engage clutch...the second think if system under normal pressure check electrical connectors if they ok,a/c compressor is faulty.

PERHAPS IT IS JUST A BAD RELAY THAT NEEDS TO BE REPLACED. HAVE YOU TRIED TO SWAP IT WITH ANOTHER ONE IN THE FUSE BOX? THIS MAYBE THE ONLY TROUBLE. MAKE SURE THAT THE FUSE IS ALSO GOOD BEFORE THE RELAY IS REPLACED. HOPE THIS HELPS. THANKS FOR USING FIX-YA AND FOR AN HONEST RATING IN ADVANCE. BEST OF LUCK. PLEASE KEEP ME POSTED.