Climate Units - Servicing, Leak Testing (Convertible): Maintenance Volvo C70 I

Topping up the lubricating oil

Note. Too much lubricating oil will impair cooling. Too little lubricating oil will damage the compressor.

The oil must be topped up when repairing a leak or when replacing a component. The quantity required for the component in question will depend on whether leakage has taken place slowly or quickly.

Slow leakage (longer than 24 hours)

With a slow leak, there is normally minimal risk of oil loss.

When installing new components the following procedures apply

Rapid leakage (e.g. hose rupture)

Rapid leakage often means that lubricating oil escapes with the refrigerant.

1. When replacing components, the new components or the system (which should be filled through the service valve) must have the oil volumes given below, except for the compressor (see the "Compressor" section below): Receiver 30 cm 3 Evaporator 50 cm 3 Condenser 30 cm 3 Tube 10 cm 3 Hose 10 cm 3

Compressor

Preparatory operations for oil return

1. Measure the volume of the oil drained from the compressor
2. Replace the volume of drained oil according to the table below

Replacing the receiver

Replace the receiver in the following instances

1. When replacing the compressor (compressor seizure for example)
2. Refrigerant leakage, where nearly 100% has leaked out of the system. (The system has no pressure)
3. When replacing any air conditioning (A/C) component outside the warranty period.

Draining refrigerant

Information

Scheme 364

Note. The ambient temperature must be above 20°C when draining the system

When draining refrigerant, the recycling unit can be attached to the service valve for both the high pressure side (HP) and the low pressure side (LP) at the same time. This is the quickest method.

1. The engine must be switched off
2. Check the amount of oil (if any) that has run out when draining the refrigerant.

Note. The recycling unit must be equipped with an oil separator. The oil separator must be of a type that allows the amount of oil in the refrigerant to be measured.

Note. Always disconnect the battery lead when working on the climate control system. Disconnect the battery lead. See Battery, replacing .

Other information

1. For vacuum pumping, see «Vacuum pumping»(ref-438305-S28963483962011120100000)
2. For visual and physical checks, see «Visual and physical check»(ref-438297-S37359878112011120100000)
3. To fill with refrigerant, see «Filling with refrigerant»(ref-438303-S41212691552011120100000)
4. To fill with fluorescent tracing agent, see «Filling with fluorescent tracing agent and refrigerant»(ref-404107-S20339298072011061000000)
5. To leak trace using an electronic leak tracer, see «Leak tracing, electronic leak tracer»(ref-404107-S13675994922011061000000)
6. To leak trace using fluorescent tracing agent and an UV flashlight, see «Leak tracing, fluorescent tracing agent / UV lamp»(ref-404107-S19096649812011061000000)