There are A few things that could cause this, The first thing to check is if there is Freon in the system, Do this by removing the cap on one of the adaptors and use A tiny screwdriver to push the button inside, If it has pressure then you have freon. Next, replace the limit switch, You do not have to lose freon to change this, There is A schrader valve that automatically shuts when the switch is removed. If those are not the problem I suggest you take it to A repair shop for checking out.
when the defroster is turned on, it activates the a/c compressor. the clutch may be locking up on the compressor.
Without the year, make or model of your vehicle it could be a bad compressor and or a bad compressor clutch.............
Check the low side pressure switch, the pigtail, the compressor clutch itself and then check to see if you still have an air gap between the hub and the clutch when the system is turned off.........
Yes, if the compressor's bearings are bad, usually accompanied by a roaring or squealing noise coming from the compressor's pulley.
Put a new fuse in. Turn on the ac, make sure you have enough freon to allow the PCM to engage the compressor. If it pops when the ac is turned on then the compressor clutch coil is most likely burnt. The fuse blows to keep the rest of the system from frying. I recommend replacing the the whole compressor. Good Luck.
Check the belt and pulleys. Make sure the AC pulley turns. When the AC is turned on, the clutch should engage to the pulley and the AC compressor should turn, and yes, it can cause the engine to vibrate a little. If the clutch doesn't try to engage, there could be some problems with the AC, but first try to find out what caused the noise, and determine if the AC compressor is turning.
It is the relay that energizes the clutch on the air conditioning compressor. Yes it does fail and remain closed after ignition is turned off, causing the battery to drain.
sounds like your A.C. compressor clutch is locking up
You mean the air conditioning compressor? It can be done, but you'll need to find a belt which will work for that application... it's a bit of a crap shoot, and I suggest you find some F150 forums to find out which belt you can do this with and how to route it, although there really is no need to bypass it.. as long as you have the AC turned off, the compressor clutch won't engage, and the pulley will spin freely.
quite possibly the A/C compressor clutch. The whining should decrease when the A/C is turned off. You will still hear some of the noise due to the clutch turning while the engine is on.
The AC clutch on a Volvo S70 is located on the front of the AC compressor, which is typically situated at the front of the engine, near the alternator and power steering pump. To access it, you may need to remove any covers or components obstructing your view. The clutch itself engages and disengages the AC compressor when the air conditioning is turned on or off. If you're experiencing issues, check the electrical connection and the clutch's functionality.
once you`ve evacuated the 22a freon,add the 134a using the adaptor provided with the kit.the compressor won`t activate when the system is low on freon.turn your ac on max with engine running add 134a,when freon pressure gets high enough the compressor will kick on.the fact that it`s not engaging would indicate a leak in the system.you can buy freon with dye in it to find the leak.once you`ve found that it`s just a matter of a new o ring usually.