Air conditioner compressor won't come on to accept freon charge

First change the belt driving the compressor. Belt slippage is the number one cause of low cooing at idle or slow speeds (if the charge is OK)

Please explain.
You can't add freon ?
The freon won't stay in the system ?
You know the engine and the compressor has to be running to add freon, right ?

The leaking heater core won't keep the compressor from working.
You say the ac system is charged, but the compressor won't come on ??
The compressor has to run to charge the system, otherwise you will only get half a can of freon to go in. The system holds 3 or 4 cans when empty.
The low pressure switch has to be jumped to make the compressor run to take the first two cans of freon.

It sounds like your blend door isn’t operating correctly . The blend door simply is a flap that is designed to close off heater core when it’s calling for A/C , and opposite for heat . Check to see if it’s operating

sound like a low freon charge

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.

The low pressure switch turns on appox 26 psi. If the pressure is lower than that, it wont work, you have a leak.

Most likely your problem is the same as mine, which means you have a crack in your air compressor therefore no matter how full you fill the freon it will always drain (or blow) right out. Solution - get a new air compressor. Try to find one in a chop shop junk yard type place if you can do it yourself.

Alternate problem - freon can lose its charge. You can take it to just about any auto store and get the freon charged up for about $70. If that doesn't fix the problem it is likely the compressor.

That clutch and coil are serviceable without replacing the compressor but I have had little success with this as usually the clutch gets in that shape subsequently from activity going on inside the compressor which means that clutch is failed generally for a reason.replace the compressor -orfice tube-reciever drier and happy motoring......

did you open the hp swich located on the high pressure ac lin you have to open the hp swich w/a paperclip in the harnes to open the system to accept the freon your trying to put in open the circut then fill