Volvo 850 Manual

Volvo 850 Manual

a/c-heater system
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1995-96 Manual A/C-Heater Systems
Volvo 850
* PLEASE READ THIS FIRST *
WARNING: To avoid injury from accidental air bag deployment,
read and carefully follow all SERVICE PRECAUTIONS and
DISABLING & ACTIVATING AIR BAG SYSTEM procedures in the
AIR BAG RESTRAINT SYSTEM article in the ACCESSORIES/SAFETY
EQUIPMENT section.
CAUTION: When battery or radio is disconnected, radio will go into
anti-theft protection mode. Obtain radio code anti-theft
protection code from owner prior to servicing vehicle.
A/C SYSTEM SPECIFICATIONS
SPECIFICATIONS
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Application
Compressor Type
.........................
Compressor Belt Tension (1)
System Oil Capacity
Refrigerant Capacity (R-134a)
System Operating Pressures (3)
High Side
.....................
Low Side
..........................
(1) - Belt tension is maintained by automatic belt tensioner.
(2) - Use PAG Oil (Part No. 11 61 407-0)
(3) - Pressure switch cut-out points.
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DESCRIPTION & OPERATION
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
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
A/C-HEATER SYSTEM - MANUAL
..............................
.......................
406-450 psi (28.5-31.6 kg/cm
1995 Volvo 850
Specification
Zexel DKS-15CH 6-cyl.
( 2) 6.8 ozs.
26.4 ozs.
25-33 psi (1.8-2.3 kg/cm
£
£
F (0
C). Blower switch
¢
)
¢
)

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Summary of Contents for Volvo 850

  • Page 1 A/C-HEATER SYSTEM - MANUAL 1995 Volvo 850 1995-96 Manual A/C-Heater Systems Volvo 850 * PLEASE READ THIS FIRST * WARNING: To avoid injury from accidental air bag deployment, read and carefully follow all SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM procedures in the AIR BAG RESTRAINT SYSTEM article in the ACCESSORIES/SAFETY EQUIPMENT section.
  • Page 2 Low-pressure switch (pressostat) turns A/C compressor on and off to maintain pressure within limits. Fig. 1: A/C-Heater System Control Panel Courtesy of Volvo Cars of North America. Fig. 2: Exploded View Of Climate Control Unit Courtesy of Volvo Cars of North America.
  • Page 3 Insert ventilation and floor/defrost cables .670" (17 mm) from where cable exits from cover. See Fig. 4. Fig. 3: Identifying Climate Control Unit Cables Courtesy of Volvo Cars of North America.
  • Page 4: Removal And Installation

    Fig. 4: Identifying Manual A/C-Heater Control Panel Cables Courtesy of Volvo Cars of North America. TESTING A/C SYSTEM PERFORMANCE 1) Close hood and front doors. Operate engine at 2000 RPM. Turn blower on third speed. Set temperature knob to cool setting.
  • Page 5: Climate Control Unit

    Disconnect cruise control vacuum cylinder, if equipped. Remove climate control unit. To install, reverse removal procedure. Lubricate NEW "O" rings with compressor oil. Evacuate and charge system. Fig. 5: Identifying Evaporator & Heater Core Connections Courtesy of Volvo Cars of North America. COMPRESSOR...
  • Page 6 Remove compressor. To install, reverse removal procedure. Lubricate NEW "O" rings with compressor oil. Evacuate and charge system. Fig. 6: Removing Cooling Fan Components Courtesy of Volvo Cars of North America. CONDENSER NOTE: When replacing condenser, always replace "O" rings and snap-on connections.
  • Page 7: Heater Core

    CLIMATE CONTROL UNIT. Remove evaporator cover screws and clips. Lift out evaporator. See Fig. 7. To install, reverse removal procedure. Lubricate NEW "O" rings with compressor oil. Evacuate and charge system. Fig. 7: Removing Evaporator Courtesy of Volvo Cars of North America. HEATER CORE...
  • Page 8: Receiver-Drier

    To install, reverse removal procedure. Fig. 8: Removing Heater Core Courtesy of Volvo Cars of North America. RECEIVER-DRIER Removal & Installation 1) Disconnect negative battery cable. Discharge A/C system, using approved refrigerant recovery/recycling equipment. Disconnect air intake hose and remove hose connector to fan cover.
  • Page 9: Wiring Diagrams

    hose connector to fan cover. Remove fan cover. Disconnect relays and wires from fan cover. Remove 4 screws and fan cover. Remove relay casing and spacers. Disconnect 2-pin connector from fan relay and connector from fan motor. Remove fan cover. See Fig. 6. 3) Shield radiator.
  • Page 10 Fig. 9: Manual A/C-Heater System Wiring Diagram...

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