How often should a car's Freon be recharged?

[DiKate]

Freon should be recharged every five to eight years for a car. The methods to determine when a car's air conditioning system needs Freon recharge are as follows: 1. When the AC is running normally and continuously, if bubbles persistently appear in the sight glass, it indicates insufficient Freon level and requires replenishment. 2. If no bubbles appear in the sight glass during normal continuous AC operation, and no temporary bubbles emerge after turning off the AC, this signifies Freon deficiency requiring discharge. 3. When the AC operates normally with no bubbles in the sight glass, but temporary bubbles appear after shutdown, this indicates proper Freon levels. 4. If the owner cannot locate the sight glass, a simpler alternative method exists: open the hood and check for oil traces at AC system connections - their presence typically indicates Freon shortage.