Question about 1991 Buick Park Avenue

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Looking for the port to put in refrigerant - 1991 Buick Park Avenue

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This port is located under the air filter box, if you remove the box you will see the highside and the lowside valves, you will hook to the lowside the valves are diffrent sizes and the hose will hook only to the small valve , thats the low side.

Posted on Aug 27, 2010


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I am trying to put an AC recharge can into my car and can not locate the valve where the cans dispenser is to be connected to complete this...please help

Attach the end of the recharge hose to the low side pressure port on the passenger's side of the engine compartment, near the firewall. Look for the metal coolant lines and follow the lines to locate the low side pressure port. The port is usually covered by a plastic cap. Screw the discharge end of the recharge hose -- the end without the handle/valve -- to the pressure port.
  • Screw the valve end of the recharge hose onto the top of the can of refrigerant. Turn the handle clockwise to pierce the top of the can of refrigerant. Turn the handle counterclockwise to allow the refrigerant to flow into the hose.
  • Start the Cutlass. Turn on the air conditioning to the maximum setting.
  • Turn the can of refrigerant upside down and gently swirl the can. This moves the refrigerant from the can to the hose and into the air conditioning system.
  • Insert a thermometer into the interior of the center air vent and test the temperature of the air coming from the duct. It should be approximately 35 degrees colder than the ambient air temperature.
  • Add more coolant if necessary. If you are using 12-ounce cans, unscrew the first can and screw the hose onto the second can. Turn the handle clockwise to pierce the top of the can, then turn it counterclockwise to allow the refrigerant to flow into the hose. Do not add more than 24 ounces to the system. Take your Cutlass to a service center if you have added more than 24 ounces to the system and there is no difference in the temperature.
  • Turn off the engine of the Cutlass.
  • Turn the handle on the recharge hose clockwise to seal the can of refrigerant of it is not empty. If it is empty, unscrew the can from the hose. Unscrew the discharge end of the hose from the low side pressure port. Place the colored cap over the pressure port.
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My 1993 dodge spirit air conditioner was changed to use new r134 refrigerant a few years ago. It is still blowing somewhat cool air, but not cool enough for July weather. I have purchased gauge for...

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