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12 Escape AC cycles on and off highway speeds

expressonate on Fri June 27, 2014 9:18 PM User is offlineView users profile

Year: 2012
Make: Ford
Model: Escape
Engine Size: 2.5
Refrigerant Type: r134a
Ambient Temp: 75
Pressure Low: varies
Pressure High: 140
Country of Origin: United States

I have a 2012 Ford Escape XLS 2.5ltr 4 cylinder fwd 5 speed manual transmission with 49k miles. My AC switches from ice cold to ambient temp when driving highway speeds in 5th gear, and in town driving. Low side pressure 38-40psi high side pressure fairly consistent 140psi 76 degrees °F 70 percent humidity at idle when AC is functioning. If engine is revved to between 2500rpm and 3000rpm, the air conditioning will start blowing ambient air temperature from the vents, and the low side pressure will rise to 65-70psi with the compressor disengaged. This rpm range similar to the rpm range when traveling at sustained speeds of 65-75mph in 5th gear. With the AC on, the serpentine belt squeaks upon letting the clutch off at the friction point of engagement. With the AC engaged, and downshifting to pass from 5th gear to 3rd gear, engine speed of 4000, there is a howling noise from the front of the vehicle that goes away immediately when powering off the air conditioning controls.

It's not shown any signs of being in a collision of any sort, and all parts except the serp belt appear to be ford OEM parts. The belt was changed at 37k miles, due to the belt squeaking at take off. It did not fix the problem. The AC hasnt been touched yet.

What are your thoughts?

2012 Escape XLS 2.5ltr 5 speed manual transmission 50k miles

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