How do you add refrigerant. - 1999 Buick Century

How do you know it is low on refrigerant?

If you try to add to a system that is already low,
it is leaking & needs to be repaired

As is,your just polluting the atmosphere & any
you add will leak out

Need a shop with the knowledge & equipment to
work on a/c

Trying to add to a system with no knowledge
or training what so ever, you will hurt yourself,
let air into the system & could damage it

If you have to add refrigerant you have a leak & need to have to system leak tested and then repaired,vacuum pulled & recharged. You need a shop that does A/C work,no way to know how much to add without knowledge & proper equipment.Be responsible & don't polute the atmosphere doing your own a/c work

You need 22oz for a "front only" a/c system and 32oz of R-134a refrigerant for "front and rear" a/c system.

The compressor is off likely due to insufficient refrigerant charge in the system. Once the minimum required charge has be provided, the compressor clutch should engage (check for blown fuse if it does not). Refrigerant is added only to the low or suction side of the compressor and only as a gas. Do not invert the refrigerant tank in an attempt to add refrigerant as a liquid! Placing the tank in warm water is a better way to fill the system (raises the pressure in the tank) without concern for slugging the compressor.

you shouldnt need to add refrigerant. you have a leak. need to replace the compressor

Total PAG oil capacity is 8 ounces if completely empty
Total Refrigerant charge is 1.6 pounds
oil replacement with just changing certain items as follows.
Compressor Replacement add 2oz
Condenser replacement add 1oz
Evaporator Replacement add 3oz
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Refrigerant is part of the A/C system. You should have special guages to add it to the system to prevent overcharging. There are do it yourself cans available at many stores but it is highly recommended that it be done professionally. If your system needs refrigerant added to it then there is a leak somewhere in the system.

Are you talking about coolant or refrigerant? There is no low pressure gauge on the engine. I am going to assume you are referring to the A/C refrigerant as you say you are burning up. I am also going to assume you are wanting to know where the low pressure inlet valve is so you can add refrigerant to the system. You have a leak or you would not need to add refrigerant. Know that it is illegal to add refrigerant R134 to any system with a leak until you have the leak repaired. You also must add the correct amount to the system. This requires repairing the leak and then having the proper gauges to determine when you have added the correct amount of refrigerant. My advice, and the only advice I can legally give you, is to take your vehicle to a professional and have the leak repaired and the system charged.

How do you know you need to add?

First you leak test,then use refrigerant
gauges to look at system

If you have a leak you evacute system & repair

You shouldn't even be involved with A/C without
proper training & equipment.

If you add you will allow air into the system,add too
much & cause compressor damage.

COMMON SENSE--if you need to add you have a leak

---if you add to a leaking system you
are knowingly poluting the atmosphere
which is against federal regulations

First off you 2006 vehicle contains no Freon R12. It contains R134 refrigerant. You have a leak or you would not need to add refrigerant. It is illegal to add refrigerant without repairing the leak. Take it to a trusted A/C specialist and have the leak repaired. They have the proper tools and expertise to add the correct amount and repair the leak.