A/c-Heater System - Automatic Volvo 960 I

A/C SYSTEM SPECIFICATIONS

A/C SYSTEM SPECIFICATIONS

DESCRIPTION

The Electronic Climate Control (ECC) system is a automatic A/C-heater system that monitors in-vehicle temperature through 2 sensors located in passenger compartment. One (solar) sensor is located on top of dashboard and senses sunlight. The second sensor is located in courtesy light fixture and senses temperature in center of vehicle.

In addition to basic A/C-heater system components, other components include an air intake temperature sensor, water (coolant) temperature sensor, servomotor and vacuum actuators. (Scheme 2)

Scheme 1

CONTROL PANEL

The automatic A/C-heater system control panel permits manual operation of system by placing blower control knob or function selector knob in any position other than AUT (automatic). (Scheme 1)

Blower fan control knob may be placed in AUT position, 0 (off) position, or 1 (low) through 5 (high) positions for manual control of blower fan speeds. Blower fan speed is automatically controlled in AUT position.

Function selector knob may be placed in defrost, vent, AUT, bi-level, or floor position. In AUT position, air distribution is automatically regulated. Air distribution may also be to floor, windshield and side windows.

Temperature control knob may be used to select desired temperature. The recirculated air button may be pressed to recirculate passenger compartment air. This function, however, will not work in defrost position. Pressing A/C off button will turn automatic A/C-heater system off.

Note. Operational description of other components not available from manufacturer.

Scheme 2

SELF-DIAGNOSTIC SYSTEM

The EEC system incorporates a self-diagnostic function that indicates system faults through a series of flashing codes. The presence of fault(s) is indicated by flashing A/C off button. The control panel is programmed to enter a pre-programmed mode when a fault is detected. Under a fault condition, the control panel ignores the faulty signal, selects an alternative pre-programmed value and prevents the delivery of faulty output signals.

Entering Self-Diagnostics

1. To enter mode, ensure engine is running. Shine a non-fluorescent, bright light on solar sensor. Place blower fan control knob in AUT position and function selector knob in vent position.
2. Place temperature control knob to maximum cooling (pointing straight down). Ensure recirculated air switch is depressed and A/C off switch is released. Depress and release A/C off button within 5 seconds to start self-diagnostic mode.
3. Each fault code consists of 3 digits. For example, Code 132 is displayed by a single flash of the A/C off button for the first digit (number 1). After an interval, the second digit of code (number 3) is indicated by 3 flashes. After another interval, the third digit of code (number 2) is indicated by 2 flashes. See «TROUBLE CODE»(/volvo/960/i-1990-1994/remont/automatic-hvac-system/#ac-heater-system-automatic) IDENTIFICATION.
4. Three different fault codes may be stored in memory. However, only one code may be displayed upon request. It may be necessary to request fault codes a number of times to ensure all fault codes are displayed.

Exiting Self-Diagnostics & Clearing Codes

To exit self-diagnostics , turn ignition off. All codes are cleared when ignition is turned off. Fault codes are not stored in memory. Even if a code has occurred several times during a period, the code will only be stored until ignition is turned off.

TROUBLE CODE IDENTIFICATION

VACUUM CIRCUITS

Using vacuum schematic and vacuum functions table, test for proper operation of vacuum circuits. (Scheme 3)

Scheme 3

Note. Additional information not available from manufacturer.

REMOVAL & INSTALLATION

1. Disconnect negative battery cable. Remove trim panel below glove box. Open glove box door, remove glove box screws and glove box.
2. Detach wiring harness and bracket from blower motor housing. Disconnect blower motor. Remove blower motor screws and blower motor. To install, reverse removal procedure.

For removal and installation procedures, see SANDEN SD7H15 A/C COMPRESSOR - REPLACEMENT OF CLUTCH or REPLACING A/C COMPRESSOR PULLEY & CLUTCH .

1. Disconnect negative battery cable. Discharge A/C system using approved refrigerant recovery/recycling equipment. Remove receiver-drier from engine compartment firewall. Remove cover plate and foam rubber seal from firewall.
2. Remove trim panel below glove box. Open glove box door, remove glove box screws and glove box. Remove evaporator housing end cover. (Scheme 4) Carefully remove evaporator core. To install, reverse removal procedure.

Note. Additional removal and installation procedures not available from manufacturer.

Scheme 4

Automatic A/C-Heater System Wiring Diagram. Scheme 5

See also:
• TROUBLE CODE