Automotive Air Conditioning Information Forum (Archives)

erickw on Sun July 12, 2015 5:40 PM

Year: 2005
Make: ford
Model: f350
Engine Size: 6.0l
Refrigerant Type: r134
Ambient Temp: 92
Pressure Low: 50
Pressure High: 270
Country of Origin: United States

Cant get ac to cool enough. Ac vents Temps are 64°f @ 700rpm idle ambient temp is 92°f low side is at 49.5 psi high 255-290 psi. Did a "full load test" @1,500 rpm for 5min ambient temp 92°f low side 36 psi high 300 psi. I also put a 24" fan near the front of the grill while doing this. I also turned off the engine and system and got 115 psi on both low and high aftet 5min it read 110 psi after 30 min 89 psi and after 4 hours it went up to 93 psi. I also cleaned the evaporator since it was a little dirty. After driving the truck for 30 min at a minimum of 65 mph the vent temps get down to 50-56°f. High pressure liquid line to ot feel hot and right after the ot the line to evap feel cold. Line to accumulator feel cold and suction line to compressor feels cold. Is the system under charged? Over charged? Compressor failure? Ot failure?

Jag987 on Sun July 12, 2015 8:01 PM

Air flow across the condenser come to mind. Spray it with some water and see what the high side does, it should drop. It is a bit high right now. How was the evaporator cleaned? Or was the condenser confused with the evaporator? How long does the engine cooling fan spin after the engine is shut off? Might have a bad fan clutch.

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I bought a can of 134a at w**-mart that had a stop leak, oil, and dye in it. It also had a hose and a gauge, so now I'm an AC pro!

erickw on Sun July 12, 2015 8:21 PM

Evap was clean was just rinsed with water yo get a good flow through the fins. Condenser has a few bugs on it, probably the typical amount on every car. Yesterday i did get my garden hose and soaked the condeser with water. Right aftet the ot, the line froze and the compressor shut off. Fan speed is constant at idle with out ac on. With ac on it does blow maybe twice as much. I didn't get a pressure reading while i soaked the condeser. I will try misting the condeser and hook up the manifold gauge set again and will report back with readings.