- 1). Open the hood of the Jeep and inspect the accessory belt. The accessory belt for the Jeep Wrangler is in the front of the engine. The Wrangler uses a rather large compressor on the driver's side of the engine bay on the bottom of the engine. The accessory belt should be wrapped around a pulley off to the side of the compressor. If the belt looks damaged or worn in any way, it may be slipping on the pulley and unable to power the compressor. The belt will need to be replaced.
- 2). Start the engine and turn the AC controls to the coldest setting.
- 3). Turn the fan speed to the highest setting.
- 4). Check the air vents for cold air. If there is no cold air being pushed into the cabin, then there is no refrigerant in the system. You will need to have the system recharged by a professional mechanic. If you turn on the AC system and you hear a faint hissing sound coming from the compressor, then there is a leak in the compressor which will need to be replaced.
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