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How to Properly Recharge Mustang A/C System
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Published on 2017-07-07
Charge the A/C system in your Mustang by yourself! Landan walks you through the easy steps on charging the A/C system in a Mustang. Be sure and have on hand a decent set of A/C manifold gauges, a vacuum pump, can tap, R134A refrigerant, and PAG oil or charge oil.
Basic knowledge of HVAC systems is highly recommended before attempting to charge an A/C system. Charge at your own risk. LMR is not responsible for any damages, injury or death.
How to Charge Mustang Air Conditioning System
What’s up everyone? Landan with Late Model Restoration. This video will cover my quick walk through on how to properly charge the air conditioning system in your Mustang.
Having a properly charged and healthy air conditioning system in your Mustang is common luxury that everyone should have. After all, a hot summer day and no A/C is no fun at all. This video will show any Mustang owner how to charge their system using R134A refrigerant.
Before doing this, it is important to understand how an A/C system works and that a licensed HVAC technician properly empties the system. You’ll also need on hand some charge oil or PAG oil and a few bottles of R134A refrigerant. Be sure and consult the owner’s manual or the under hood sticker to see how much your system takes.
In our case, this Fox Body has an R12 weight amount which is slightly different because this system has been converted to R134A refrigerant using a premium 5.0resto conversion kit. Start at seventy-five percent of the R12 weight and go up from there until the system is properly charged.
To charge the A/C in your Mustang at home, you will need a decent set of manifold gauges, vacuum pump and of course oil and refrigerant.
With the system properly emptied, you can begin by connecting the high and low service ports.
The high-side service port is typically found on the line connecting the compressor to the condenser. This is true in our case.
Now, the low-side service port is typically found between the compressor and accumulator. This is also true for our application.
These two ports are also typically different diameters, so getting them mismatched is almost impossible.
Go ahead and connect the vacuum line to the vacuum pump.
This connection only needs to be finger tight.
Once connected, make sure the high-side valve is fully closed and the low-side valve is open.
Turn on the vacuum pump and let it run for fifteen to thirty minutes.
Once the gauge reads thirty inches of mercury for vacuum, close the valve and then turn off the pump.
Let this sit for approximately an hour to make sure that there are not any leaks in the system.
When that is verified, open the valve and run the pump for an additional thirty to forty-five minutes.
Now you can close the valve, turn off the pump and then disconnect the vacuum line.
Screw the line onto a can tap.
Pierce the can of Freon and then open the low side valve.
When the first can is empty, close the valve on the low side and then start the vehicle.
Turn the A/C on and the fan speed on high.
If your compressor does not kick on, check out this simple trick.
Make a jumper and install it onto the clutch cycling switch electrical connection.
With the A/C still running, pierce another can of Freon and completely fill the system to the recommended amount.
Depending on the ambient temperature you are in, your low and high side pressures will differ.
Our pressures were spot on since we were working in a room that was approximately seventy degrees.
Be sure and remove your jumper and reconnect the clutch cycling switch.
You’re all finished!
Charging an A/C system can seem somewhat intimidating, but hopefully this helpful video will persuade you first timers to give it shot. Remember, have a licensed shop drain the system first before you go about charging your system. Also, be sure and set aside a few hours to get this one accomplished.
To see more helpful videos like this one, be sure and subscribe to our YouTube channel if you haven’t already done so. For all things 1979 to present Mustang, keep it right here with the real Mustang enthusiasts, LMR.com!