Refrigerant Circuit with Restrictor and Reservoir
Evacuating and Charging Valve with Schrader ValveIndicator lamps and fuel gauge
Fig. 129 In the instrument cluster: Variants
A and B: fuel gauges for petrol and diesel. Variant C: fuel gauge for autogas
First read and observe the introductory information
and safety warnings 
Lit up
Needle position 
Possible cause †...
Physical Principles
The four known states of water also apply to air
conditioning system refrigerants.
1 -
gaseous (invisible)
2 -
vapor
3 -
fluid
4&nbs ...
Refrigerant Circuit with Restrictor and Reservoir
1 -
A/C Compressor
2 -
Condenser
3 -
Restrictor
4 -
Evaporator
5 -
Reservoir with dryer bag
...