A/C Pro

Tips from the Pro

Post: How long will leak sealers keep leaks sealed?

It of course depends on the nature of the leak, but typically leaks are sealed for approx 12 months of A/C usage.

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Post: How fast will leak sealer work?

The leak sealer will take effect within 1 day of installation.

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Post: With dye remaining in the system, will the dye show any future leaks?

Yes, the dye will continue to work the same way.

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Post: Is it safe to keep dye in the system?

Yes. The dye will not affect A/C performance.

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Post: How do I find a leak?

The best way to find leaks is with our R-134a UV Leak Detection Kit (part # 436) which provides UV dye, high-intensity UV light and yellow tinted protective glasses

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Post: How do I know if I might have a leak?

If your A/C is not blowing cold you probably are low on refrigerant due to a leak. Most leaks are in rubber components such as O-rings, hoses and gaskets.

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Post: How do I know if my compressor is on?

You can tell if you compressor is cycling on and off by looking at the clutch (or belt pulley) at the front of the compressor. The center of this clutch (see below image) should be spinning when the compressor cycles on. Please note that the pulley itself will always spin while the center of the clutch may not. Below is a video of a compressor cycling on and off properly:

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Post: What if my compressor clutch is not engaging but the pulley is spinning freely?

If the refrigerant charge is low the low pressure cut out or low pressure cycling switch can prevent the clutch from engaging. Adding refrigerant should alleviate the problem.

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Post: How do I know if my compressor is working?

If the compressor is engaging, the center of the compressor clutch will turn with the outer pulley. If the pulley does not turn and there is a loud squeal, this usually indicates a locked up compressor. The compressor and drier will need to be replaced. Here is a video showing a compressor that is running properly.   

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Post: What is Ambient Temperature and what should my pressure readings be?

Ambient temperature is simply the temperature of the air surrounding the car. The following automotive A/C chart outlines the proper pressure readings for a particular temperature range. For instance, if the ambient temperature (outdoor  temperature) is 75°, the corresponding low side pressure should be between 35-45 psi and if needed the corresponding high side pressure would be between 150-170 psi.

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