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:

Opening the tailgate
Fig. 29 In the vehicle key: tailgate release button Fig. 30 Opening the tailgate from the outside First read and observe the introductory information and safety warnings Before opening the tailgate, always remove any items of luggage that are on the luggage carrier attached to the tailg ...

Interior monitoring system and anti-tow alarm
Fig. 26 Next to the driver seat: button for switching off the interior monitoring system and anti-tow alarm First read and observe the introductory information and safety warnings The interior monitoring system will trigger an alarm if movement is detected inside the vehicle when the vehicl ...

Engine Cooling
Because towing places higher demands on the engine cooling system, the cooling system is enhanced in vehicles that have factory-installed trailer hitches, if necessary. This is done by installing a stronger or a second coolant fan and/or a larger radiato ...