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A/C Not Cooling During The Day

MorePower7701 on Sun July 27, 2008 12:26 AM User is offline

Year: 1990
Make: Ford
Model: Ranger
Engine Size: 4.0
Refrigerant Type: 134a
Ambient Temp: 92
Pressure Low: 30
Pressure High: N/A
Country of Origin: United States

My Ranger has a strange problem, in the morning and evening the A/C works great, but during the middle of the day it will not keep up. The best I can get vent temp is 60deg on a 90+deg middle of the day, but in the morning it can be 80+deg outside and I will have a vent temp of 42deg. The A/C components are fairly new, the condenser is clean, the motor runs cool, good air flow. The accumulator is sweating fine, there appears to be plenty R134a in the system, but I wonder if there is to much. I have an A/C hose that is leaking and needs to be replaced, I will have to open the system to replace it. Would it be a good idea to replace the accumulator, o-rings, orifice tube, flush the evap and condenser coil, sweep the system, pull a vacuum, then recharge?

TRB on Sun July 27, 2008 1:36 PM User is offlineView users profile

It would help to list both the low and high side pressures at idle and 1500 RPM. Also would check that the fan clutch is working correctly. Was the system charged correctly, I.E. no air in the system.


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MorePower7701 on Sun July 27, 2008 10:02 PM User is offline

Sorry for the double post. I was able to fix the problem, there was non condensables in the system, the head pressure was over 250psi. I recovered the R134a, (I'm EPA Universal certified and do HVAC work) replaced the discharge hose, flushed the system, swept the system, replaced the o-rings, accumulator, pulled a vacuum, added 9oz of clean PAG oil to a dry clean system, and recharged. Now, the A/C works fine, 32 low pressure 190 high, 90deg outside temp and a vent temp of 43deg. Does these pressures and vent temp seem correct?

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