Oil air conditioning (A/C) system, filling
Special tools
9511204
Replacing the Receiver Drier
Replace the receiver drier in the following cases
- when replacing the compressor (e. g., compressor breakdown)
- refrigerant leakage, where nearly 100% has leaked out of the system (the system has no pressure)
- when replacing any air conditioning (A/C) component outside the warranty period.
Filling the A/C system with oil
Note. On newer filling/draining/vacuum-pumping stations there is a reservoir for injecting oil. This can be used before filling with refrigerant and after vacuum-pumping without needing to remove the needle valve in the service valve.
Note. Fill with oil before vacuum-pumping.
Filling with PAG oil
When replacing pipes/hoses, oil can be filled through the service valve.
When filling the vehicle with PAG oil (for P/N see spare parts catalog), carry out the following
- Remove the needle valve in the service valve using valve tool «9511204»(ref-403953-S29886163752011061000000) .
Scheme 358
Use the filling syringe (without plastic hose) supplied with the unit to top up the oil. Clean the syringe to avoid the possibility of mixing different types of oil.
- Check according to the table above. Measure how much oil is to be added. After topping up the oil, reinstall the needle valve.
Note. Use only your thumb and index finger when tightening the service valve using valve needle tool 9511204 . This is to prevent damage to the seal on the service valve.
Air Conditioning (AC) System, General Instructions
Any leakage must be repaired immediately in order to prevent moisture entering the system.
Ensure the work area is kept dry and clean. Moisture and dirt will reduce the efficiency of the air conditioning (A/C) system.
Store compressor oil in a sealed container (compressor oil absorbs water).
When working on A/C systems, for example when replacing components, open ends must always be plugged immediately after undoing pipe or hose connections. When installing new components, leave the protective plugs in the holes until the component is actually needed. If dirt may have entered any component it must be inspected and cleaned.
If the car has been damaged in a collision it is important that every component in the system is inspected. Special attention must be paid to brazed joints. Cracked or deformed components must not be repaired.
Desiccant in the Air Receiver/Dryer
The dryer must be replaced when repairing a major leak or replacing a component, or if moisture is suspected to have entered the system. The unit need not be replaced more often than on every third occasion if only minor work is carried out under favorable conditions. Favorable conditions are defined, for example, as a slow leak (over 24 hours) which is repaired immediately. When installing new components in a one-year-old car the receiver need not be replaced.
| CAUTION | To avoid corrosion, the system must be filled immediately after installation. |
If the car has been left standing for more than 24 hours without refrigerant in the system, the system must be flushed twice with approximately 200 grams of refrigerant. Between the two flushing operations, pump the system completely empty for at least 10 minutes.
Note. Return used refrigerant to the supplier who is responsible for safe disposal of environmentally harmful substances.
Aim
To offer the customer a passenger compartment which is free of bad odors and pollutants.
General
By placing an air quality sensor in the air intake it is possible to measure the amounts of polluted air, primarily from motor vehicles. The signal from the air quality sensor is used to exclude the pollutants by using the recirculation (REC) mode. An activated carbon filter is installed in the heater. This filter takes care of the pollutants in the couple of seconds before the recirculation shutter closes and on those occasions when recirculation cannot be used because of misting. The filter and the sensor are interdependent to provide the customer with as clean a passenger compartment as possible. The climate control system is equipped with a button to activate the system.
The filter
By supplying a particle filter with activated carbon, gases entering the passenger compartment can be absorbed. The focus of exclusion is on the following substances: NO, NO2, HC (benzene, toluene, xylene), CO, ozone.
What can activated carbon absorb?
Cold start: Good absorption of petrol components is usually achieved.
Manure: Ammonia is badly absorbed, however some neutralization can be expected.
Exhausts: Good separation of uncombusted hydrocarbons and "diesel odor" is achieved.
Oil odor: Good.
Water treatment plants: Sulphuric acid cannot be dealt with.
Solvents Good.
Pulp mills: Many odorous substances. Some can be absorbed.
Odors are complicated and are difficult to explain in terms of concentrations and percentages. A filter will reduce odors and minimize strong odor changes and will therefore improve comfort. The car can never be completely odorless. In some cases the odor compounds may seem unexpected because the constituent substance compounds are modified.
Sensor
The sensor registers NOxCO and HC. These are the most prominent compounds produced by motor vehicles. The sensor registers increases in concentrations, for example when a tunnel is entered or when driving behind a truck. The sensor learns the environment it is in and only reacts to the relevant increase in concentration. One point is that the sensor reacts to CO, a compound which activated charcoal filters cannot handle.
Fluorescent Tracing Agent, Production
Volvo has introduced a fluorescent tracing agent into production.
The tracing agent is impregnated in a free standing "Dry-Water" cylindrical filter in the drying agent in the dryer.
The tracing agent dissolves and mixes with the compressor oil in the climate control system. The tracing agent is light green in color. It is used to identify any leakage in the climate control system. If an UV lamp is used, it is easier to see where the fluorescent tracing agent is leaking out.
The receiver drier is supplied without tracing agent for aftermarket orders.
For information about filling and leak tracing using fluorescent tracing agent, see Refrigerant, Draining .
Fluorescent Tracing Agent, Aftermarket
Volvo has introduced a fluorescent tracing agent for aftermarket use.
Facts about the tracing agent
- The tracing agent is in liquid form. It is mixed with the A/C compressor oil in the climate control system
- The tracing agent is light green in color. It is used to identify any leakage in the climate control system
- If an UV lamp is used, it is easier to see where the fluorescent tracing agent is leaking out.