Freon is added through the low side pressure port. A gauge will be needed to check that the system is not overfilled. The Freon and gauge can be bought together as a kit.
freon for 1999 ford explorer =========================== r134a ( Helpfull )
Either buy the R-12 off eBay or use Freeze 12..................
You can put Freon into your air conditioning system through the low pressure port. The low pressure port can be found on the top of your air conditioning compressor.
it is 134-a
It is illegal to use #12 due to damage to ozone layer
On a 1996 Ford Explorer : ( r134a )