Volkswagen Polo Service & Repair Manual: Water Content

Volkswagen Polo Service & Repair Manual / Refrrigerant R134a Servicing / A/C System, General Information / Refrigerant R134a Characteristics / Water Content

Only very small amounts of water are soluble in liquid refrigerant. On the other hand, refrigerant vapor and water vapor mix in any ratio.

Only a small drop of water may get into the refrigerant circuit. The dryer, dryer bag or dryer cartridge contained in the reservoir can absorb approximately 7 grams of water. They are then saturated and cannot absorb any more water. If water is still present in the refrigerant circuit, it flows up to the expansion valve nozzle or restrictor and becomes ice.

The air conditioning system stops cooling.

Water destroys the air conditioner as it combines with other impurities at high pressures and temperatures to form acids.

Combustibility

Refrigerant is non-flammable. It actually has a fire resistant or fire extinguishing effect. Refrigerant decomposes when exposed to flames or red-hot surfaces. UV light (occurring for example during electric welding) also causes refrigerant decomposition. The resultant decomposition products are toxic and are not to be inhaled. However, irritation of the mucous membranes provides an adequate and timely warning.

Commercial Names and Designations

Refrigerant R134a is currently available under the following trade names: H-FKW 134a SUVA 134a ...

Charge Factor

A vessel must have space for vapor as well as liquid. As the temperature rises, the liquid expands. The space filled with vapor decreases. At a certain point, there w ...

Other materials:

Insulating glass windscreen
Fig. 71 Metal-coated windscreen for infrared reflection with communication window (blue area) First read and observe the introductory information and safety warnings Insulating glass windscreens have a coating which reflects infrared radiation. There is a non-coated area above the interior ...

Electric windows – functions
First read and observe the introductory information and safety warnings One-touch opening and closing One-touch opening and closing makes it possible to fully open and close the windows. The individual buttons do not have to be held down to do this. For one-touch closing: pull the button for ...

Introduction
This chapter contains information on the following subjects: → Indicator lamp → Description of the central locking system → Locking and unlocking the vehicle from the outside → Locking and unlocking the vehicle from the inside → SAFELOCK mechanism &nb ...