Put it in the low side. The small round valve. Make sure the ac is on.
The 1999 Oldsmobile Alero does not have Freon in the A/C system. It contains R134 and not Freon which is R12. As I am sure you do not have the proper equipment to recharge the system plus the fact it is illegal to add refrigerant to a system with a leak, until the leak is repaired, take it to a professional and have the leak repaired. You have a leak or you would not need to add refrigerant.
The refrigerant needs to be added on the low pressure side of the compressor. this is located under the front of the vehicle by the bottom of the radiator. the line has a fitting which should have a blue cap on it. that's where you add the freon.
I am not a tech, but I looked up parts for my Olds on GMparts worldwide and they provided a diagram to show locations of parts. The diagram is located next to Add to Cart and it is called view illustration. It is great. Hope this helps
Buy a kit from auto parts or Wal-Mart comes with instructions
the low pressure{or suction}line is located under the air filter housing
First, your 1998 Mercury contains no Freon which is R12. It contains R-134 refrigerant. You add R134 at the low pressure port. But the fact that you need to add R134 indicates you have a leak. It is illegal to add refrigerant to a system with a leak without first repairing the leak. Seek professional help and have the leak repaired.
Low pressure line Larger line running from compressor
The 1998 Chevy did not come with Freon (R12) installed. Freon was banned beginning in 1996. It contains R-134. You have a leak that needs repairing before adding more refrigerant. It is illegal to add refrigerant to a system with a leak. Seek out professional help to repair the leak.The 1998 Chevy did not come with Freon (R12) installed. Freon was banned beginning in 1996. It contains R-134. You have a leak that needs repairing before adding more refrigerant. It is illegal to add refrigerant to a system with a leak. Seek out professional help to repair the leak.
To add refrigerant to a Dodge Dakota find the suction hose of the A/C system. On the suction hose locate the port to add more refrigerant to the system.
134a refrigerant
Many home AC units are sealed, and there is no way for a homeowner to add refrigerant.
FreonThe connection is on or close to the receiver dryer. If you add too much, the compressor will lock up or it won't cool very good. They don't sell Freon any longer. By the way, your car takes R134A refrigerant. If you add Freon, you ruin it.