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How do you refill the freon for the air conditioning system in a 1997 dodge caravan?
Wiki User
∙ 14y ago
First you need to determine why you need a recharge of R134a coolant. If you haven't yet purchased a set of pressure gauges you'll need to check with your auto parts store and see what they can provide. Connect the gauge to the low pressure port and run the engine with the A/C on full. Check the reading. If it reads low then you probably have a coolant leak somewhere. You can purchase coolant recharge canisters with UV dye embedded in the product. Charging the system with this and then using the UV light and glasses that are sold where you buy your products will tell you if the leak is something simple like an O-ring. or more involved like a hose, or some other hardware. If you find it to be a simple fix great. But before you buy a couple cans of refrigerant and pump them into your system you really need to vacuum the air out of the system. You'll need professional help with this, unless you know someone who works in the A/C business who owns a vacuum pump and will loan it to you. Why vacuum? Moisture. Moisture mixes with the refrigerant and becomes corrosive and will eat away at the internals of your A/C. If the vacuum draws to about 30 bars and holds pressure you are ready to recharge. You can connect the refrigerant canisters to the low pressure port and recharge.
One thing to consider. If the vacuum/pressure of the A/C system was compromised you probably exposed the air dryer to atmospheric moisture. You should replace the air dryer, prior to recharging the system.
Wiki User
∙ 14y ago
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