1995 Volvo 850 A/C-Heater System - Manual
System is equipped with a cycling clutch system that uses an expansion valve in refrigerant line between condenser and evaporator, near condenser. System is engaged when A/C switch on control panel is pressed. See Fig. 1. Pressure switch on accumulator cycles compressor clutch on and off. Blower fan speed is controlled by sliding switch on lower left of A/C-heater control panel.
Airflow modes are controlled by center knob on A/C-heater control panel. Mode doors are controlled by cables on left side of climate control unit. See Fig. 2. Temperature blend (air mix) doors, located on driver and passenger side respectively, is selected by left or right knob on A/C-heater control panel. Doors are controlled by cables on left side and center of climate control unit.
Fresh/recirculated air is selected by switch to lower right of mode knob on A/C-heater control panel. Door is controlled by recirculation motor on upper half of climate control unit. Air conditioning system will only operate above 32 £ F (0 £ C). Blower switch must be in position “1″ or higher to engage compressor. A/C compressor is connected in series with the low-pressure switch, high-pressure switch, and safety switch. The high-pressure and safety switch cut power to the A/C compressor if pressure in the A/C high-pressure circuit becomes excessive, supplying a signal to ECM to start cooling fan. Low-pressure switch (pressostat) turns A/C compressor on and off to maintain pressure within limits.
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