Check the Label Before Replacing A/C Refrigerant

Check the Label Before Replacing A/C Refrigerant

Never attempt to service a car's air conditioning system without first checking the SAE J639 sticker.

Federal, state and local regulations govern proper procedures for recovering, recharging and recycling R-134a motor vehicle air conditioning (A/C) refrigerant.

You can find relevant details specific to a vehicle’s refrigerant requirements on the sticker under a vehicle’s hood. The label shows refrigerant type and amount, and information about compressor lubricant. The location of this sticker varies by vehicle but is generally located somewhere up front. The sticker is governed by SAE Standard J639, which provides safety and design standards for automotive air conditioning refrigerant systems. 

Technicians must check the vehicle’s sticker before servicing the vehicle. Failure to check the sticker could void the refrigerant recovery machine’s warranty and significantly increase the chances of using an incorrect amount of refrigerant or the wrong type or amount of PAG oil.

The relevant portions of this sticker are:

Refrigerant Type: Make sure the refrigerant type is compatible with your A/C recovery machine.

Refrigerant Amount: This is the amount of refrigerant you will tell the machine to put back into the vehicle during recharge (assuming all of it was removed in recovery, which is the normal method).

Compressor Lubricant Type: This shows the type of PAG oil required by a vehicle’s compressor. Most vehicles are 46, 100 or 150. Use the correct viscosity for the vehicle being serviced. • Compressor Lubricant Amount: This is the full amount of PAG oil the compressor can use. You only need to replace the amount that was removed during service plus 15 mL or 3 to 4 percent of the full amount shown here.

For more information about air conditioning recovery processes and equipment, visit BendPak.

You May Also Like

Belt Service For Hybrid and Stop/Start Systems

Knowing how to “force start” a hybrid vehicle can be helpful if you are trying to diagnose a noise problem that involves the accessory belt drive system.

Here is a tech tip you can use if you are seeing more hybrids and stop/start vehicles with noise complaints at your shop. Noise problems can be challenging to replicate on these vehicles because the gasoline engine doesn’t run constantly and starts only under specific conditions.

Key Programming

When it comes to key programming, there are different levels of security access depending on the year, make and model of the vehicle.

ECU Reflashing

Reflash procedures are not getting any faster.

The Impact of Fuel Type on Engine Performance

When recommending fuel options for customers, consider engine design, manufacturer recommendations and usage.

Battery Management Means Knowing How It Ages

The battery may be fully charged, but you also need to measure how low the voltages go while the engine is cranking.

Other Posts
AC Service – R1234yf

With a few simple steps, you can ensure that your A/C machine is properly maintained and ready for the upcoming A/C season!

Ignition Coil Output

To see inductance inside the primary windings, use an amp probe placed around the positive wire for the ignition coil.

Compressor Oil for R1234yf

Working on R-1234yf systems is not that different from the R-134a variety.

Turbochargers on Minis

No matter if it is a BMW or MINI, when the engine stops turning, the oil flowing to the turbocharger stops.