Is the system full of freon ? Is the clutch getting power from the relay ??
A lot of time when you are low on r134a in the system the clutch will not engage.
hi know it sounds silly but please start by checking all of the fuses and you can usually swap the relays over to eliminate them . unfortunately we dont have expeditions in australia so i cant tell you what fuse or relay to check. then if you take a look at the ac compressor it should have one wire going to the clutch if you check for 12 v at this wire with the air on and the key on if there is no power you need to look for what is called a hi low switch this checks for hi or low pressure in the air cond gas system this can be on the compressor or in the a/c pipes it should have 2 wires and again with the key on and the air on one of these wires should have 12 v if you bridge these two wires the compressor should click .if that happens you need to take the car somewhere to get it checked for leaks the regassed
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SOURCE: Should the AC compressor clutch engage when the
yes. the ac removes moisture from the cabin of your car. if it is not engaging that is why your windows are fogging up. you need to have the ac pressure checked. you may just need a recharge.
SOURCE: 2004 5.4L Ford Expedition -Eddie Bauer-
it doesnt have enough gas in the system ,its put in with a special machine and its weighed in by weight
SOURCE: AC compressor won't engage clutch
Lots of things can cause this, I will list them, easiest first.
A blown fuse or relay can prevent the clutch from kicking in. Low refridgerant charge will also do this, the low pressure switch will prevent the clutch from engaging when there is low refrigerant to prevent damage. You may need to put more in, and you also may need to jump the low pressure switch to get the compressor going to add more in. Very rarely the controls could have gone bad, which are the buttons on the dash. Id check out the fuses, relays, and pressure in the system first. A shop may even do a free diagnosis for you.
Testimonial: "The fuse is good, but I can only find a relay for the fan motor. "
SOURCE: my ac clutch will not engage on my 1999 ford expedition
It sounds like it's either out of freon, or compressor oil. You can pick up a can of refrigerant that has the oil in with it at any Autozone or Advance Auto. It'll have the pressure gauge and fill hose with a coupler already on it. Hook it up with the engine running and a/c turned on...compressor should kick on pretty quickly. Hope this does the trick for ya!
SOURCE: ac clutch not engaging on a 2004 ford escape
A mechanic would check for voltage at the fuse and relay, and also check the system to see if it is full of freon. If the clutch has voltage and ground it may need to be replaced.
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