Danger | Risk of explosion when using a forming gas with incorrect mixing ratio. Risk of suffocation due to inhalation of forming gas. Risk of injury due to bursting of high-pressure hoses. | Wear safety glasses and protective gloves. No smoking or open flames. Work in well-ventilated rooms only. | |
Warning | Risk of poisoning caused by inhaling overheated refrigerant vapors from an air conditioning system containing R134a. Risk of injury to skin and eyes caused by contact with liquid R134a refrigerant and when working on pressurized parts | Never perform welding work on or near a closed air conditioning system. No smoking or open flames. Wear safety glasses and protective gloves. Work only in well ventilated rooms. Carry out repair work on the air conditioning system circuit only after the system has been evacuated. | |
Topical note | Procedure for a damaged or leaky air conditioning system | ||
Notes on handling refrigerant R134a | |||
| Check | ||
1 | Evacuate air conditioning system | ||
2 | Fill air conditioning with forming gas and check pressure drop | ||
| 000 588 19 21 00 Leak tester | ||
| |||
Do not fill air conditioning system with forming gas unless engine is cold. | |||
Keep to the leak tester manufacturer's operator's manual when connecting and operating the leak tester throughout the entire procedure. | |||
Pressure drop in refrigerant circuit filled with test gas | |||
3 | Check for leaks in air conditioning system using gas detection unit | If no pressure drop was detected. | |
| 000 588 03 21 00 Gas detector | ||
Observe the gas detection unit manufacturer's operator's manual. | |||
In the event of leakage | |||
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Replace leaking or damaged air conditioning components. | |||
4 | Evacuate the forming gas in the refrigerant circuit using leak tester | ||
| 000 588 19 21 00 Leak tester | ||
5 | Charge air conditioning system |