Rick's Free Auto Repair Advice

How much oil to add to AC when replacing components

Here’s how much oil to add to AC when replacing components

The general rule of thumb on how much oil to add to AC

When you replace a major AC component, you must add oil to the system to replace the oil in the bad component.

Use the exact oil specified by the carmaker and don’t overdo it. Too much oil will reduce cooling performance because it coats the walls of the condenser and evaporator and reduces heat transfer. Too little oil, on the other hand, can cause damage to the compressor.

  • Compressor = 1.4 ounces
  • Evaporator = 1.5 ounces
  • Condenser = 1 ounces
  • Accumulator = 1 ounces
  • Hoses = 1 ounces

Refer to this link for total system charge and total oil capacity.

How much oil to add to new AC compressor

Most new AC compressor come filled with oil. However, you can’t just install them that way. You want to match the amount of oil in the old compressor. To do that you need to drain the oil compressor and measure how much oil is in the compressor crankcase and install the new one with that same amount.

See this post for step by step directions

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Posted on by Rick Muscoplat

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