Heater System
The heater system uses engine coolant to provide a heat source transferred to the interior airstream via a heat exchanger matrix mounted in an ‘air blend’ unit housed within the chassis well, ahead of the cabin footwell.
The coolant is fed from an outlet on the left-hand side of the cylinder head, and via an alloy pipe running along the outside of the RH chassis side rail to the matrix.
Air Conditioning (If Fitted)
The air conditioning unit uses a cycling clutch system with a thermostatic expansion valve to provide refrigerated air to the vehicle interior.
The system comprises: a closed circuit containing refrigerant R134a; a compressor mounted on the front side of the engine; driven by multi-vee belt from the front end of the crankshaft via an electromagnetic clutch;
Components
Condenser, evaporator unit, thermostatic expansion valve, receiver-drier unit, and compressor.
Operation
The compressor is energized when the engine is running and the refrigeration controls demand it.
The thermostat senses the temperature of the refrigerated air as it leaves the evaporator and signals the compressor to cycle on and off.
Manual:
Download: Lotus Service Notes Section PL: Heating, Ventilation, and Air Conditioning
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