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208 Service. Self Study Programme 208 Air Conditioner in the Motor Vehicle Fundamentals 1,6 1,4 1,2 MPa 1,0 0,8 sure0,6 res P 0,4 0,2 0 30 20 10 0 10 20 30 40 50 60 70 Temperature oC air condition Air conditioning systems have long ceased to be The design of the refrigerant circuit of an regarded as luxury equipment. air conditioner is identical in all vehicles. Air conditioners have become a factor in active Air conditioner refrigerant circuits only vary in safety, and today can almost be considered as respect of how they are adapted to meet an integral part of a vehicle s safety refrigeration requirements. specification. In this Self Study Programme, you will familiarise 10 years ago, only about 10 percent of yourself with the basic purpose and design of an all newly registered vehicles were fitted with an air conditioner. air conditioning system. By 1996, air conditioners You will learn the functions of the component were being installed as standard in more than parts in the refrigeration process, the special one in four newly registered vehicles. characteristics of the refrigerant and why air conditioners require special service Customer demand for air conditioning is rising specifications. continually. The component parts shown in the following SSP are common to most air conditioners. Please note that the figures specified are given by way of example only. Depending on refrigeration requirements, the absolute values vary from vehicle to vehicle. New Important Note The Self Study Programme Please always refer to the relevant Service Literature is not a Workshop Manual for all inspection, adjustment and repair instructions. Service literature. 2 Table of Contents The in car climate . 4 Why air conditioning The physics of the cooling system 6 Applied physics MPa o C The refrigerant 8 R The cooling system . 12 134a The principle of