A/c clutch on '98 jeep grand cherokke won't

You do know the compressor must be running to allow the system to be charged, right ?
If the system is low you have to jumper the low pressure switch or otherwise provide power to the compressor to put new cans of freon in.
And it will only go in on the low side of the system, which should be the only side you can connect the hose to.

probably out of freon have it checked for leaks

when you state it wouldn't crank, do you mean the starter won't engage or that it just spins over and doesn't start? if no gauges or no starter engagement, then check the battery, battery connections,and the starter for excessive amperage draw. if the starter spins and the engine won't start, then check crankshaft position sensor first. the crank sensor is a more common failure than the distributor or any of the other things you mentioned.

Has the Freon been checked with a gauge to see if there is enough Freon to allow the system to work. Low or no Freon will not allow the compressor to engage. The low pressure switch is most likely activated due to low freon, and will cause this condition.

Hi,
Looks like the a/c compressors relay is malfunctioning. Replace the relay with a similar one.
Hope that helps you out!

You will need to add freon. Freon loss has most likley occured and if so, there is a leak somewhere in the system. The clutch will not engage if the freon level to too low.

not swich on
burnt fuse
faulty relay
faulty relay swith
faulty clutch coil
empty or low freon

The compressor clutch won't engage unless there is freon in the system. Connecting a gauge to the low pressure port should tell you if there is. Pressure in a system that isn't running varies with the outside temperature.

Well Bruno it sounds like you lost freon from your a/c system.The cabin filter wont restrict you from getting cold air.Check that your a/c clutch engages when you turn it on.if it dont you need freon and have to check for leaks

this is most likely a a lack of r-134a (as freon is no longer used), if your system is completely out or close to it then the pressure sensor will not allow the compressor clutch to engage, it is also possible that there is an electrical issue but less likely. to know for sure you need to put some gauges on the system