1994 Nissan 300ZX AC Evaporator Replacement Cost

Any number of problems in the air conditioning system can cause the same symptoms. A servicing technician will need to examine the whole thing to make the right diagnosis. Typically, the evaporator coil would be suspected after testing for leaks, especially if it's clear there's a leak even if it can't be visibly detected. Also, if the technician finds that the pressures in the system are too extreme, the evaporator may be suspected of a clog.

The air conditioning system will have to be evacuated and the evaporator will need to be accessed. This is usually done through a service port near the passenger foot well or by removing the dashboard. The evaporator can be removed by disconnecting all its mounting hardware and using specialized tools to remove the air conditioner lines. Replacing the evaporator is a matter of refitting the lines, replacing any components removed to access the evaporator, and recharging the system for testing.

We recommend avoiding the use of any off-the-shelf air conditioning repair additives. These additives are only temporary fixes, if they work at all, and can cause damage to air conditioner refrigerant evacuation machines. Also, never attempt to vent refrigerant into the air — this is harmful to the environment and can cause chemical burns. 

When it comes to servicing the air conditioner, it's best left to the pros. They will have the equipment needed to safely evacuate refrigerant and refill the system.