Fault Tracing Climate Units

Fault tracing climate units







Warning! Follow the safety instructions for work on the air conditioning system. Refer to: Safety information air conditioning system Safety Information Air Conditioning System

Note! First read the instructions covering slow and fast leaks. Refer to: Oil air conditioning (A/C) system, filling Oil Air Conditioning (A/C) System, Filling

See information about the A/C-system. Refer to: Air conditioning (AC) system, general instructions Air Conditioning (AC) System, General Instructions

Note! Always plug the pipes and connections when working on the climate control system.

Overview A/C components

Location of Climate Control System Components (Engine Compartment):

engine compartment
1. Compressor
2. Hose/pipe compressor-condenser
3. Condenser
4. Hose/pipe junction block side member-compressor
5. Pipe expansion valve-junction block side member
6. Expansion valve
7. Pipe accumulator-expansion valve
8. Intermediate pipe accumulator-member/expansion valve
9. Accumulator
10. Service valve, (LT)
11. Service valve, (HT)
12. Pressure sensor






Service valves
1. High pressure side (HT) service valve
Draining, vacuum-pumping, and filling
2. Low pressure side (LT) service valve
- Draining, vacuum-pumping

Location of Climate Control System Components (Climate Control Unit):

Climate control unit
1. Heat exchanger
2. Evaporator
3. Fan motor
4. Power unit
5. Damper motor air distribution
6. Damper motor temperature right
7. Damper motor temperature left
8. Damper motor recirculation
9. Damper motor defroster (ECC)
10. Coolant pipe connection, to/from engine room
11. Temperature sensor evaporator (LHD)
12. Temperature sensor evaporator (RHD)

Location of Climate Control System Components (Passenger Compartment/Door Mirror):

Passenger compartment/door mirror
1. Climate control unit
2. Ambient temperature sensor
3. Passenger compartment temperature sensor (ECC)
4. Sun sensor (ECC)
5. Climate control unit
6. Air quality sensor
7. Multifilter/filter

Overview of the A/C system





Refrigerant path
1. Compressor
2. Condenser
3. Cooling fan
4. Receiver drier
5. Expansion valve
6. Evaporator
7. Blower fan

Explanations:
- A - High pressure, hot liquid
- B - Low pressure, cold liquid
- C - Low pressure, cold gas
- D - High pressure, hot gas
- Dark arrow - Hot air
- Light arrow - Cold air

Troubleshooting consists of three sub procedures in total with a number of steps in each. Not all steps need to be performed if the fault has been rectified before.

Fault tracing step 1 of 3

General check
1. Set the car to room temperature (approx. 20 C°).
2. Connect VIDA diagnostic and download the AC check software 30745960 and check:
Evaporator temperature sensor
Temperature sensor passenger compartment
Ambient temperature sensor
Sun sensor
3. Check the damper motors
manually - temperature/temperature sides, defroster, ventilation, floor & recirculation
with VIDA diagnosis
4. Check blower fan speeds.
5. Check passenger compartment filter cleanliness.
6. Check distance between drive plate and pulley.




7. Check the drive/auxiliaries belt.
8. Check the cleanliness of the condenser.

Fault tracing step 2 of 3

Carry out a performance test on the climate control system. Refer to: Climate system, performance test Climate System, Performance Test.

Fault tracing step 3 of 3













Pressure measurement
Use special tool: T9814092
- The pressure is measured on the high resp. low pressure side service valves.
- Before connecting the manometer to the car's service valves both the knobs must be turned clockwise (-) to the limit position.
- Connect the manometer to the service valves, hang from the bonnet opening, start and run the engine at idle.
- Inner adjustment of the climate control follows the same procedure as step 2 performance test.
Read off the values after the A/C has stabilized or after approx. 8 min.












Explanations:
- If the pressure values are outside the stated values (see above) the reason must be established.
- F = Fixed displacement- resp. V= Variable displacement compressor
- 6 x tables represent all the different fault symptoms on Volvo Car Company A/C systems with two service valves, with tips, results and action in order of priority.