Mobile Car Air Conditioning Perth diagnosis can sometimes involve finding an air conditioning leak that does not occur all the time. We recently inspected a Toyota from Morley with an unusual refrigerant leak.

The vehicle had a faulty air conditioning evaporator. However, the leak was not present every time we tested the system.

The evaporator would leak and then appear to seal itself again. The fault could reappear around two days later. This made the problem much more difficult to identify than a constant refrigerant leak.

Toyota Air Conditioning Losing Refrigerant

When a vehicle loses A/C refrigerant, the first step is to find where it is escaping.

A large, constant leak can sometimes be relatively straightforward to locate. An intermittent leak can be much harder.

During testing of this Toyota, the system did not always show the same result. At certain times the evaporator would leak. At other times it appeared to hold pressure correctly.

This meant a single test could easily miss the problem.

Intermittent A/C Evaporator Leak

The air conditioning evaporator is located inside the vehicle’s HVAC system. Its position can make evaporator faults more challenging to diagnose than some engine bay leaks.

In this Toyota, the evaporator had developed an intermittent leak.

The unusual part was how the fault behaved. The evaporator could leak refrigerant and later appear to seal again.

Around two days later, the leak could return.

This type of fault demonstrates why air conditioning diagnosis sometimes requires more than one quick test.

Why Can an A/C Leak Be Difficult to Find?

Not every refrigerant leak behaves in the same way.

Temperature and system pressure can change while a vehicle is being driven or parked. Components also expand and contract as their temperature changes.

A small fault may therefore leak under certain conditions but appear sealed under others.

This can make an intermittent A/C leak difficult to locate.

A system might even pass a test at one point and show signs of leakage later. For this reason, previous symptoms and test results can provide valuable information.

Proper A/C Leak Detection Matters

Repeatedly adding refrigerant does not repair the source of a leak.

If refrigerant continues to disappear, further investigation is required.

Our Mobile Car Air Conditioning Perth service focuses on finding the cause of poor A/C performance before recommending repairs.

This is particularly important when dealing with an intermittent fault.

In the case of this Toyota from Morley, the faulty evaporator explained the refrigerant loss. The intermittent nature of the leak explained why the fault was difficult to confirm.

Signs of a Leaking Car A/C Evaporator

A leaking evaporator may cause the air conditioning to gradually lose cooling performance.

The system may initially blow cold air after being serviced. Cooling performance can then become weaker as refrigerant escapes.

Eventually, the air from the vents may no longer feel cold.

An evaporator leak may also be difficult to see because the component sits inside the HVAC housing.

Proper testing is therefore important when an evaporator problem is suspected.

Mobile Car Air Conditioning Diagnosis in Perth

This Toyota from Morley is a good example of why refrigerant leaks are not always straightforward.

The evaporator did not leak continuously. It could leak, seal itself again and then show the fault approximately two days later.

A quick test performed while the evaporator was sealed could potentially miss the problem.

CMM Automotive provides mobile car air conditioning service in Perth for many common and unusual A/C faults. We can test systems for leaks and investigate poor cooling performance.

If your vehicle keeps losing refrigerant after an A/C service, there may be a leak that needs further investigation.

Finding the actual cause is important before carrying out further repairs or adding more refrigerant.