You'll need to locate the low-pressure service port. This is typically:
* On a fitting on the drier/accumulator: This is a common location, often near the compressor. The drier/accumulator is a cylindrical component within the AC system.
* On a separate line near the compressor: Less common, but possible.
To find it:
1. Consult a repair manual specific to your 1990 Pontiac Lemans: This is the best option. A Haynes or Chilton manual will show diagrams and pinpoint the location.
2. Look closely at the AC components: The compressor is a large component, usually near the front of the engine. Trace the lines from the compressor; the low-pressure service port will be on one of them. The port is usually capped.
3. Search online for pictures: Search on Google Images or similar using "1990 Pontiac Lemans AC recharge port" or "1990 Pontiac Lemans AC low pressure port". Comparing images might help you locate it.
Important Safety Considerations:
* Improperly recharging your AC system can be dangerous. If you're not comfortable with this task, take your car to a qualified mechanic.
* R12 refrigerant is harmful to the environment and its use is now illegal in many places. If your car uses R12, it needs to be converted to R134a by a professional. Simply adding R12 is not an option.
* Wear safety glasses when working with refrigerants.
Remember, working on car AC systems requires special tools and knowledge. If you're uncertain about anything, seeking professional help is always the safest and most reliable approach.
