you cant, only a professional shop can charge it. the price will very depending on vendor. something to consider is why it needs to be charged? if you disconnected one of the ac lines yourself and let it drain out? or did it leak out? a common cause of system leaks is a cracked O-ring in one of your quick couplers. safe yourself some money by checking them yourself instead of paying the shop too when they charge it.
The 1993 Ford Ranger air conditioning charge valve can be found on the top of the air conditioning compressor. The charge valve will be marked as the low pressure valve.
£49.95
It depends on the company. However, any air conditioning company will charge double if you let them look at your air conditioning at short notice.
Blue port. If you have the rear air then the charge will be greater than front air only.
Find the tag it will tell you there.
You may need to charge your a/c with coolant.
There is a leak somewhere in the air conditioning system. Mechanic shops have a special dye they can add to the system to find the leak.
Low refrigerant charge?
25-30 psi
where is low side charge port located
Low freon charge? Heater cable not fully in cool position?
To properly charge the air conditioner you need gauges and a refrigeraant recovery system.