System Introduction

Land Rover vehicles use different types of heating/air conditioning or climate control systems depending on the vehicle model or year. The earlier systems were R-12 split systems that utilized an adjustable thermostat controlling a cycling rotary compressor, to increase or decrease cooling capability.

The first Range Rover heating and air conditioning systems were separate and worked independently. In 1989 the system was redesigned and this change enabled the two systems to work together to improve the demisting (defog) function. A heated windshield was installed in 1989 to further improve demist performance. This dual mode was used until 1995 when the air conditioning system was completely changed. All air conditioning systems from 1994 model year have been 134A systems in different configurations (except 1994 Classic). The Defender 90 unit is an air conditioning system added to the existing heating system. The Discovery and 1995 RR Classic (short and long wheelbase) are similar both utilizing a combined heater core/air conditioning evaporator housing. The housing uses right and left temperature blend doors to split the system providing right and left temperature control of the vehicle interior. The Range Rover 4.0/4.6 has a complete computer controlled climate control system that will maintain the selected temperature whatever the outside temperature may be.

Air Conditioning System
Air Conditioning Evaporator - Air (3) drawn only from the vehicle interior is blown through the air conditioning evaporator (2) where it is cooled and then discharged through the face level vents 6.







Air Conditioning Evaporator
1. Heating ventilating unit
2. Air conditioning evaporator
3. Air intake and fans (inside vehicle)
4. Refrigerant connection
5. Cold air ducts to face vents 6