A/C Pro

Tips from the Pro

Post: I get two pressure readings while checking my low-side pressure, which one should I use?

When checking low-side pressure you will get two different pressure readings, one when the compressor cycles on and one when the compressor cycles off.  Use the pressure reading when the compressor is cycled on and the system is operating at its highest settings (temp to max cold and fan on high). When the compressor cycles on you should see the needle on your pressure gauge begin to drop. When the compressor turns off you will see…

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Post: Do I need to vacuum out my system before charging?

Your system should be vacuumed if you have replaced a component part in the system, or if the pressure gauge indicates that the A/C system pressure is lower than 10psi.

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Post: How much refrigerant should I put in?

We recommend using a pressure gauge to determine an accurate fill. A/C Pro’s color-coded gauges indicate whether you should continue filling (charging) or not.

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Post: If I put in refrigerant (top off), do I need to add oil too? If so, what type and how much?

IDQ’s top off products contain the proper ratio of replacement oil.

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Post: My A/C is blowing cold but not as cold as I would like it. Will adding additional refrigerant make the air colder?

The answer here is two fold. It is possible that the system has a small leak, and now is low on refrigerant. This will allow the system to blow cold, but just not as cold as it used to. In this case check the low-side pressure and verify if the system is low on refrigerant. If it is low on refrigerant add refrigerant or a refrigerant with a stop leak to the correct pressure. If your…

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Post: Can I add R-134a directly to my R12 system?

No. Federal law prohibits topping off an R12 system with a different refrigerant. Your options are to locate some R12, however you must be certified to purchase, and add it with an R-12 recharge hose. Or you can convert the system using one of our R-134a retrofit kits that will allow you to now add 134a refrigerant to your automotive air conditioning system. You will have to make sure that you remove any residual R12 by…

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Post: What about so-called “drop in” refrigerant that I see advertised on the market?

The EPA requires that ANY replacement refrigerant MUST have unique fittings, charging devices and label. Therefore, the EPA states that “drop in” refrigerants are illegal. Furthermore, only R-134a has been tested and approved by the original equipment manufacturers.

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Post: How do I locate my low pressure port?

The low side service valve is located in the line that runs from the compressor through the evaporator (firewall) and up to the condensor on the low pressure (suction) side of the system. R-134a Recharge hoses will only fit on the low side service port on all R-134a vehicles and R-12 vehicles that have been converted to R-134a. If you don’t know where your low side port is you can try using our low side port…

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