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There are 2 ports on the lesabre. One will be marked H or High and the other will be marked Low L or Suction. The suction side may be on the silver or black thremos like tank on the firewall or possibly on the compressor. GM used several A/C compressors this year so it will vary by type

You always charge in the LOW pressure L or Suction side. NEVER on the high side.

It is very easy to overcharge and damage or imbalance the system so it won't work. If it is empty completely you may need to have it evacuated and leak checked before recharging.

If this is the case, the decal in the engine compartment often shows the oz that will fill the system if empty. That makes it easy to fill correctly.

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Q: How and where to put refrigerant134a in to a 2000 Buick LaSabre?
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