Is Vacuuming Necessary When Recharging Car Air Conditioning with Refrigerant?

[OAngelo]

Whether vacuuming is required when recharging a car's air conditioning with refrigerant depends on specific circumstances: 1. If it's merely a refrigerant top-up, vacuuming is unnecessary; 2. If refrigerant needs to be added or replaced due to leakage, vacuuming is mandatory. Without vacuuming, the refrigerant quantity added would be insufficient, resulting in poor cooling performance. Never rush when recharging car air conditioning - wait five minutes after starting the engine for stable pressure readings (optimal range: 4.5-5). Skipping vacuuming before refrigerant recharge can damage the compressor and impair cooling efficiency. Proper recharge requires a refrigerant gauge - operation is impossible without one. Non-vacuumed systems retain air in the compressor, causing seal leakage and damage, which subsequently leads to refrigerant loss.