How do you fix a 1998 dodge ram 1500 air condition?

Answer 1

You have a certified shop do it. By law, such repairs must be done by an ASE certified tech in an EPA approved shop. This is to prevent refrigerant from being released into the atmosphere. Additionally, it also ensures that it's done right, as a typical backyard mechanic is not going to have the thousands of Dollars worth of equipment to ensure this.

Even if this weren't the case, the question couldn't be answered because the problem hasn't been diagnosed. How an AC system operates is broken down into seven "conditions". Condition one is normal operation. Conditions two through seven indicate a malfunction, each with different causes, and each having different effects on pressures throughout the AC system. It requires a manifold gauge set and the know-how to tell what the numbers indicate.

Depending on what the malfunction is, parts may need to be replaced. When the air conditioning system is opened up, refrigerant must first be evacuated and stored (this is where the ASE certified tech and EPA certified shop comes into play), and either the receiver-drier (if the system uses a Thermal Expansion Valve) or accumulator (if the system uses a Fixed Orifice Tube) will have to be replaced whenever an AC system is opened up.