Q: I am adding refrigerant. I need to know the low side pressure if the ambient temp is 95 deg.

asked by on

I am adding refrigerant to my 2004 f150 5.4L. I need to know what the low side PSI should be if the ambient temp is 95 deg.
My car has an automatic transmission.

When the A/C compressor is running, the low side pressure should be between 20-40 PSI. There is no spec for A/C pressure when the system is off though, rather they just specify a specific amount of refrigerant that should be in the system. This is done by using a refrigerant recycling machine, and recovering all the old refrigerant, putting the system under vacuum, and then putting in a specific amount. The same results can also be achieved by using a precise refrigerant scale and A/C gauges. I would not recommend using a simple can of refrigerant, as there is no way to accurately monitor the amount of refrigerant in the system. If you want to have this done for you, a technician from YourMechanic can come to your home or office to properly perform an AC recharge on your vehicle.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. I am adding refrigerant. I need to know the low side pressure if the ambient temp is 95 deg.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: If I can get diagnostic codes for a turbo, is that enough to go off of to start working on and repairing a turbo?

White smoke coming from the exhaust tends to be caused by coolant mixed in the engine oil. In most cases, this is due to damaged cylinder head gaskets or other damaged done by an overheating problem. It's very hard to...

Q: Airbag light and CK Suspension light on, with a small oil leak.

Your vehicle is equipped with self-leveling air suspension. When the computer in your car determines there is a fault in the self-leveling system it will turn on the check suspension light. I would ask for help from one of the...

Q: Cranking up

The Check Engine and Oil Pressure Light may flash if the oil pressure switch did not give an oil pressure signal to keep the fuel pump running. I suggest having the vehicle scanned for any codes, then test and replace...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.