In case your air conditioner is not really cooling properly because the system is lower on refrigerant, recharging the system with refrigerant should really restore ordinary operation. This can generally be executed that has a few cans of refrigerant in addition to a uncomplicated service hose connection.


1st, wear safety glasses to protect your eyes. Also prevent skin get in touch with with refrigerant. The chilling impact of spilled refrigerant could cause immediate frostbite on bare skin or eyes!


Following, you may need to discover what sort of refrigerant your vehicle calls for:
On 1995 and newer passenger cars and light trucks, the right refrigerant is R134a. Will not use any other style of refrigerant.

On most 1994 and older passenger cars and light trucks, the authentic refrigerant was R12. R12 is no extended available to do-it-yourselfers and it is quite high-priced. When older vehicles with R12 A/C methods need refrigerant, they could be refilled with recycled R12 from other older cars (this calls for taking your car to a repair shop for professional service), or with some option refrigerant other than R12, or with R134a (which requires specific modifications).

CAUTION: Mixing diverse kinds of refrigerants is not really recommended. Use the exact same variety of refrigerant that is presently in the system unless of course you’re converting an older R12 system to R134a or yet another refrigerant.

WARNING: Flammable refrigerants are illegal. Usually do not use any kind of flammable refrigerant (propane, butane or flammable hydrocarbons).

Locate THE Services FITTINGS
Subsequent, you will need to track down the service fittings to the A/C system. There are actually two: a Reduced side fitting along with a Large side fitting. The Reduced side fitting is normally positioned about the suction hose or line that goes in the accumulator to the compressor. The High side fitting is found about the line that goes from the compressor towards the condenser.

ac very low and substantial side service fittings

On older R12 methods, the Very low and High strain services fittings are screw-type schrader valves. On newer R134a methods, the Low and High side service fittings are quick-connect fashion fittings. The Lower strain fitting is Smaller sized than the Substantial pressure fitting.

air conditioning refrigerant can hookup for recharging

1. Connect the recharge service hose and valve to a can of refrigerant.

2. Turn the valve to the services hose to puncture the top from the can.

3. Gradually turn the valve back out to release a small level of refrigerant into the hose. This will blow air out of the hose (which you do not want as part of your A/C system).

4. Near the valve so no extra refrigerant escapes, then promptly connect another end in the services hose on the Lower stress services fitting to the A/C system.
CAUTION: Don’t connect a can of refrigerant for the Large side services fitting. The operating stress within the A/C system when it truly is operating may exceed the burst strength of the can, triggering the can to explode! This should really be impossible to undertake as the service hose for recharging the A/C system will only match the more compact Very low pressure services fitting. Even so, you should be aware of the danger.

5. Hold the can UPRIGHT so no refrigerant liquid enters the services hose. You only want VAPOR to be pulled in to the A/C system (the compressor may be damaged if it sucks within a big dose of liquid!).

6. OPTIONAL BUT Highly Recommended: It is best to use a gauge to monitor the recharging practice. Although not definitely needed, a gauge can help you recharge your A/C system far more accurately, and decrease the possibility of undercharging or overcharging (either of that may reduce cooling effectiveness).

A higher stress A/C gauge could be linked to the High strain services fitting, or maybe a low pressure A/C gauge to your Lower stress services fitting, or gauges could be connected to both fittings (that may be what qualified technicians do).

NOTE: Some DIY recharging kits include things like a very low strain gauge on the services hose or on the trigger-grip style can dispenser.


7. Start the engine and turn the A/C on MAX/HIGH.

8. NOTE: The compressor may perhaps not engage in case the system is too reduced on refrigerant. The reduced strain cutout switch will prevent the compressor from operating if the system is as well very low on refrigerant (that is executed to guard the compressor from harm thanks to a lack of good lubrication). The compressor need to be operating to suck refrigerant with the service hose to the system. So if it is not engaging after you turn the A/C on, you could really need to provide battery voltage directly on the compressor clutch employing a fused jumper wire. Appear to get a single wire connector near the front of the compressor, unplug it and hook up a jumper wire to your battery Positive terminal. This need to lead to the clutch to engage plus the compressor to run.

9. OPEN the valve within the services hose so refrigerant vapor will flow in the can to the A/C system. It could consider as much as 10 minutes or even more per can to suck all of the refrigerant out of the can to the A/C system. Experience the air coming out of the ducts within the vehicle. It should be getting colder.

10. If you’re utilizing a large or reduced pressure gauge (or the two) to monitor recharging, have a look at the gauge(s).

Reduced pressure gauge: Once the reading through is amongst 25 and 40 psi with the A/C operating, Quit. The system is fully charged and really should be cooling ordinarily. Usually do not add any extra refrigerant. In case the gauge is over 50 psi, you have got overcharged the system with too much refrigerant.

Higher strain gauge: If the studying gets up around 200 to 225 psi (R12), or225 to 250 psi (R134a), Stop. The system is thoroughly charged and need to be cooling ordinarily. Tend not to add any additional refrigerant.

NOTE: The higher and very low strain readings will differ based about the system and ambient temperatures (larger temperatures induce higher system strain readings).

Refer to the motor vehicle producer specifications for usual system operating pressures, and the complete refrigerant capacity on the system. Most newer passenger car A/C systems never hold significantly refrigerant (only 14 to 28 oz.), which means you don’t need to add excessive if the system is low. One can of R134a generally holds 12 oz. of refrigerant.

11. If your system requires a lot more refrigerant right after including one can, you may add a second can. Close the valve on the services hose, then disconnect the hose from the empty can, screw a brand new can onto the service hose valve, turn the valve to puncture the brand new can, then turn the valve the many way back out once again so refrigerant can flow with the hose into the A/C system.

After you have finished, turn the engine off. Near the valve around the can of refrigerant in advance of disconnecting the service hose in the Very low strain fitting (in situation there may be any refrigerant left in the can). Do not vent any left more than refrigerant in the can. Leave the service hose attached to your can together with the valve closed so you can preserve the refrigerant to get a long term recharge.

Remember to change the plastic caps above the services fittings, and remove the jumper wire in the compressor for those who had to jump it to create it run.


If your A/C stops blowing cold air many days, weeks or months soon after you recharged it, it signifies the system includes a leak as well as the refrigerant is escaping. You should add some leak detection dye to your system to search out the leak. The leak must then be repaired prior to the system is recharged yet again, otherwise you are just wasting your time recharging the system above and in excess of once again.