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How To Add Freon - 1999 Pontiac Grand Prix 3800 V6

Updated on July 17, 2012

How to Add Freon

Many times, during warm weather driving, a driver will notice that it is beginning to take longer and longer for the auto air conditioner to cool down the car. As time goes by, the car will eventually blow little to no cool air.

This is an indication that the air conditioning system in the car needs attention. If this is a newer car, it’s possible that there is a problem with the system and it’s probably best to take the car to a certified mechanic to diagnose the problem. If it’s an older car, the system probably needs a recharge.

For those shade tree mechanics, who have the confidence, aptitude and desire to fix things themselves, recharging the air conditioning system is fairly straight forward. For those who lack the confidence, aptitude and desire, it’s best to leave this one to a mechanic or someone who can work on cars.

Freon Recharge Kit

freon-recharge-kit | Source

Low Pressure Service Port Location

low-pressure-service-port-location | Source

Set Air to Max Settings

set-air-to-max-settings | Source

Check Air Temperature At Vent

check-air-temp-at-vent | Source

Low Side Service Port Cap Removed

low-side-service-port-cap-removed | Source

Steps to Add Freon to a Grand Prix 3800

To recharge the air conditioning system on a 1999 Pontiac Grand Prix 3800 V6, the steps outlined below can be used as reference or general overview, but they are no substitute for a good maintenance manual. It is important to follow all safety procedures outlined in the vehicle owners/maintenance manual. If these procedures are not followed, serious injury or even death may result. This is a pressurized system, so precautions should be taken when performing maintenance.

1. Obtain an r134a recharge kit. Read all the instructions that come with the kit and follow these instructions when working on the car.

2. Read the cars service manual to identify the different components of the air conditioning system and the type of Freon to be used. The 1999 Pontiac Grand Prix uses r134a Freon. Identify the location of the low side pressure service port.

3. Start the car and turn the air conditioning system on to max with the windows rolled down. Let the car run for approximately 3 minutes. Use a temperature gauge to determine the temperature coming out of the center vent. If the system is fully charged, the temperature should be around 40 degrees give or take a few degrees. Remove the cap from the low side pressure service port. Connect the quick connect fitting, hose and gauge to this port. Take a reading from the gauge. If the system is low, a modern day gauge will show this. Disconnect the quick connect fitting.

4. Add the can of r134a Freon to the hose. Reconnect the quick connect fitting, hose and gauge to the low side pressure service port. Release Freon into system via the method described in the instructions provided with the recharge kit. Keep a close eye on the gauge while moving the can back and forth every few seconds. The system should be charged up to the appropriate pressure for outside or ambient temperature. Never overcharge the system. Once the system is charged, disconnect the quick disconnect fitting and replace the cap on the low side pressure service port.

5. Return to the interior and check the temperature gauge in the center vent. The gauge should now be blowing at or around 40 degrees and the temperature in the car should feel noticeably cooler.

Use Gauge to Take Reading

Guage Reading
Guage Reading | Source

Add Freon

Add Freon
Add Freon | Source

Cool Air

Cool Air
Cool Air | Source


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      chris 2 months ago


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      Matt 5 years ago

      Very helpful my ac works again.