Removal And Installation; Climate Control Unit - Volvo 850 Supplement Manual

1) Raise and support front of vehicle. Perform TEST MODE 2
under TROUBLE SHOOTING. ECC control module should respond to vehicle
speed signal with Code 1-1-3. ECC control module will continue to
flash code even once TEST MODE 2 is activated. If Code 1-1-3 does not
appear, turn ignition off. Cover solar sensor. Turn ignition on. Start
TEST MODE 2. Let car wheels turn freely. Open throttle.
2) If no acknowledgment code appears after several attempts,
there may be a problem with vehicle speed signal impulse sensor in
ignition system, instrument panel, or wiring.
3) Check if speedometer operates. If speedometer does not
operate, a fault may be present in vehicle speed signal impulse
sensor, ignition system, instrument cluster, or wiring. If speedometer
does operate, check for open circuit in instrument cluster wiring.
REMOVAL & INSTALLATION
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.
A/C RELAY & POWER STAGE
Removal & Installation
Turn ignition off. The A/C relay and power stage are located
on A/C climate control unit, behind glove compartment. Remove glove
compartment. Remove A/C relay. Disconnect connector from power stage.
Hold catches in and pull connector straight out from power stage. See
Fig. 15. To install, reverse removal procedure.

CLIMATE CONTROL UNIT

Removal & Installation
1) Disconnect negative battery cable. Remove dashboard
assembly. See DASHBOARD. Discharge A/C system, using approved
refrigerant recovery/recycling equipment. Disconnect evaporator inlet
and outlet pipes, and cap both ends. Remove evaporator cover plate and
gasket from firewall. See Fig. 17.
2) Disconnect heater hose quick-disconnect couplings. Remove
heater hose cover plate and gasket from firewall. Inside vehicle,
disconnect A/C-heater control cables and all electrical connectors
from climate control unit. Remove relay shelf. See Fig. 15.
3) Remove tunnel console. Remove kick panels next to tunnel.
Remove rear floor ducts connection hose. Remove radio amplifier
bracket. 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.