Join Date: Jan 2011
Location: Virginia Beach, VA
Thanked 1 Time in 1 Post
Is My A/C Over Charged?
Starting from an evacuated system, I tried to weigh and install my refrigerant. Turns out my refrigerant hose on my gauge set had a leak so only a portion of my 134a actually went into the system. When I was finished and realized that the system was not cooling, I put the gauge set back on and this time was paying attention to the pressure readings. In 100 degrees, AT IDLE, the reading were well below the acceptable range on the chart.
So there I was right back to guessing how much refrigerant the system needed. I started adding refrigerant, AT IDLE SPEED. After adding about 20 oz, I was getting readings in the middle to the high part of the recommended range....seemed real good and now the system was cooling well.
HOWEVER, when I increase rpm to about 1200, the pressure readings go OFF THE CHART!...way high! So I am trying to decide if I have over charged the system. The FORD factory manual says to charge the system at IDLE speed, which is what I did and got good readings at this speed.
Is it normal for pressures to go REAL high at faster than idle speeds. The system is cooling REALLY WELL with over a 40 degree temp drop across evaporator. Am I over charged?
Any comment/help will be appreciated.
2004 F350 Lariat, Ext Cab
SRW, 6.0 TD, LOADED Shorty
Autometer Fuel Pressure
MBRP Turbo Back 409
DieselSite Coolant Filter
OilGuard Bypass Filter
Fumoto Drain Valve
HFCM Water Separator Drain Plug
50 gal TransferFlow
Sliding Cargo Bed
Warn 8000 lb Winch (Draw Bar Mount)
MacNeil Floor Liners
Galaxy DX95T 10 Meter w/ CB Mod
Wilson 5000 Antenna
Kimber SS .45 cal UltraCarry w/ LaserMax!
Frame Mounted Safe
Empty Weight with 80 Gal Fuel 8400 lbs