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2000 Ford Excursion cooling problem

OhioRiverCigarette on Sun July 25, 2010 3:49 PM User is offline

Year: 2000
Make: Ford
Model: Excursion
Engine Size: 7.3
Refrigerant Type: 134A
Ambient Temp: 93
Pressure Low: 46
Pressure High: 175-225
Country of Origin: United States

System is not cooling well. Here is the info that I have. It was recorded on two different times.

The truck is a 2000 Ford Excursion 7.3 diesel with rear air.

Day one.
System was taking to long to cool off, so I hooked the gauges to see what was going on.

Suction side was 70 psi. high side was ~225.

I thought the charge was high so I used and empty 30# can and ice to recover some charge. I go the pressures to

Suction 46 psi
high side was jumping around 175-225

Duct discharge temp after 20 minutes of driving (90 degree day) was 58-60

I drove it but it still is not cooling well.

Day two
temper measured with IR gun

Evap box rear air lines
85 degrees at expansion valve 76 after txv
74 degrees leaving the coil

160 degree discharge
110 degree suction

Front expansion valve
160 entering
110 leaving

bohica2xo on Sun July 25, 2010 5:28 PM User is offline

Looks to be undercharged, with some other issues.

Recover the charge, and pull the orifice tube for the front system. It should be a Red tube. If it is not badly contaminated, you can probably get by with a couple of ounces of oil, and some dye for testing.

Get the full charge into the system by weight. Diagnosis is not possible without a full charge. Running it undercharged starves the compressor for oil.

Run the fully charged system with both evaporator fans on the highest speed, and the front doors open. Run the engine @ 1500 rpm for 5 minutes, and record the high & low pressures while holding 1500 engine rpm. Post the results.


"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

OhioRiverCigarette on Sun July 25, 2010 9:29 PM User is offline

Will do.


OhioRiverCigarette on Sun July 25, 2010 9:30 PM User is offline

What do you expect the suction line pressure to be?

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