However, if you're determined to tackle it yourself, be prepared for a challenging job that involves the following steps:
1. Preparation:
* Consult a Repair Manual: Obtain a repair manual specific to your 1997 Pontiac Trans Am. This is crucial for detailed instructions, diagrams, torque specifications, and component locations. A Haynes or Chilton manual will be helpful.
* Gather Tools: You'll need a wide array of tools, including various sockets, wrenches, screwdrivers (Phillips and flathead), a refrigerant recovery/recycling machine (absolutely essential to protect the environment and your health), a vacuum pump, possibly a manifold gauge set, and potentially specialized tools for accessing certain components.
* Safety First: Wear safety glasses, gloves, and appropriate clothing. Work in a well-ventilated area. Refrigerant is dangerous if inhaled.
2. Accessing the Evaporator Core:
This is the most labor-intensive part, varying depending on the specific model of your Trans Am (GT, WS6, etc.). Generally, it involves:
* Disconnecting the Battery: Always disconnect the negative terminal first.
* Removing the Dash: This is usually the biggest hurdle. Expect to remove the steering wheel, instrument panel, center console, and possibly parts of the HVAC system. This step often requires patience and careful removal of numerous screws, clips, and connectors.
* Accessing the HVAC Housing: Once the dash is out, you'll need to locate and carefully remove components surrounding the evaporator core. This might include blower motor, air ducts, and other parts of the HVAC system.
* Draining and Recovering Refrigerant: This is critical. Use a refrigerant recovery machine to safely remove the refrigerant from the system. Releasing refrigerant into the atmosphere is illegal and harmful to the environment.
3. Replacing the Evaporator Core:
* Removing the Old Core: Once access is gained, carefully remove the old evaporator core, taking note of its location and connections. Take pictures to help with reassembly.
* Installing the New Core: Install the new evaporator core, ensuring all seals and connections are properly seated.
* Reassembly: Carefully reassemble the HVAC housing, air ducts, and other components removed earlier.
4. Final Steps:
* Vacuuming and Charging the System: After reassembly, you must thoroughly vacuum the system to remove any air or moisture. Then, recharge the system with the correct amount and type of refrigerant using your refrigerant charging machine. Follow the instructions on the refrigerant can and your repair manual carefully.
* Testing and Leak Check: After recharging, test the system for leaks and proper cooling performance. A leak detection dye can be helpful.
* Reinstalling the Dash: Carefully reassemble the dashboard and all interior components.
Again, this is a highly complex process. Improperly performing any of these steps can lead to serious problems, including damage to your vehicle's HVAC system, environmental hazards, and personal injury. If you're not completely comfortable with automotive repair and have the necessary tools and experience, take your car to a professional mechanic. The cost of professional repair will likely be far less than the cost of damaging components during an attempted DIY repair.
