Hello All, can anyone provide a pressure chart, covering High Side and Low Side A/C pressures, with relation to ambient temperature, for R-1234YF? After a few hours on the web I found only 3 charts for R-1234YF. I am reluctant to use any of them because they differ so much from one another. I would really like to see one from a credible source- Ford if possible. Thank You.

 

2022 3.5 PowerBoost: Ambient Temperature between 21 °C (70 °F) and 38 °C (100 °F)



2022 3.5 PowerBoost: Ambient Temperature Above 38 °C (100 °F)

 

 

Great Info SALEEN961, now I see why my Web search results varied so much. Those are some wide ranges per Ambi Temp. Thank You!

 

Hello,
Can you tell me if these PT charts would work for a plain jane 2019 F-150 with a 3.3 engine?

 

The PT charts for your 2019 3.3 are different from the ones that I posted earlier. You will want to use the ones posted below.

Inspection

NOTE: Procedure 2— Ambient Temperature between 21°C (70°F) and 38°C (100°F)

1. Run the engine until it reaches normal operating temperature.
2. Connect the air conditioning service unit to the refrigerant system.
3. Set temperature to the lowest possible temperature setting with the dual function disabled (if equipped). Manually set blower on HI. If the vehicle has a fresh air/recirc button, set it to FRESH. If the vehicle has an A/C switch or compressor on switch, set it to A/C ON.
4. Open all vehicle windows and leave the hood open for the test. Open the rear doors.
5. Confirm the compressor is operating and the engine cooling fan(s) are operating or engaged. Allow the vehicle to idle until the suction (low-side) and discharge (high-side) pressures are stable or fluctuate in a range that repeats.
6. Record the ambient (shop) temperature.
7. Record the discharge pressure. If the pressure is fluctuating, record the average value.
8. Determine if the discharge pressure falls within the normal operating limits using the Normal Refrigerant Discharge Pressures 21 - 38° C (70 - 100° F) Ambient (30- 60% Relative Humidity) chart below.
   
   
9. Record the suction pressure. If the pressure is fluctuating, record the average value.
10. Determine if the suction pressure falls within the normal operating limits using the Normal Refrigerant Suction Pressures 21 - 38° C (70 - 100° F) Ambient (30 - 60% Relative Humidity) chart below.
    
    

Inspection

NOTE: Procedure 3— Ambient Temperature between 38 °C (100 °F) and 49 °C (120 °F)

1. Run the engine until it reaches normal operating temperature.Connect the air conditioning service unit to the refrigerant system.
2. Set temperature to the lowest possible temperature setting with the dual function disabled (if equipped). Manually set blower on HI. If the vehicle has a fresh air/recirc button, set it to FRESH. If the vehicle has an A/C switch or compressor on switch, set it to A/C ON.
3. Open all vehicle windows and leave the hood open for the test. Open the rear hatch and/or rear doors (if equipped).
4. Confirm the compressor is operating and the engine cooling fan(s) are operating or engaged. Allow the vehicle to idle until the suction (low-side) and discharge (high-side) pressures are stable or fluctuate in a range that repeats.
5. Record the ambient (shop) temperature.
6. Record the discharge pressure. If the pressure is fluctuating, record the average value.
7. Determine if the discharge pressure falls within the normal operating limits using the Normal Refrigerant Discharge Pressures 38 - 49° C (100 - 120° F) Ambient (15 - 40% Relative Humidity) chart below.
   
   
8. Record the suction pressure. If the pressure is fluctuating, record the average value.
9. Determine if the suction pressure falls within the normal operating limits using the Normal Refrigerant Suction Pressures 38 - 49° C (100 - 120° F) Ambient (15 - 40% Relative Humidity) chart below.
   
   

 

Saleen961,

Might you have these pressure/temperature charts for a 2018 F150XLT with 2.7l Ecoboost and R-1234YF refrigerant?

Thanks

 

The charts I found aren't specifying R134a or R1234yf, but this is what I found in the service manual: