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Old 08-08-2011, 09:02 AM
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ANOTHER A/C Problem!!!!!

The last one I was wrestling with apparently got sent out behind my back to another shop, not good, its on the street now, so we'll see what happens....anyway, another rig, another problem....this one is a 08 E350 6.0L...A/C blows warm after about an hour on the street, this one was also sent to an A/C specialist shop, and now dropped in my lap

Here's what I got: At idle, Low Side - Passed 120psi (yes, very high) High Side - Just over 150psi - inlet of the condenser is hot, outlet is warm to the touch, just passed the orifice tube going onto the evaporator is cold and has drops of water, but warm coming out.......

Also, while at the shop it was sent to, they installed a compressor, orifice tube, accumulator, and fan clutch....I'm seeing multiple issues, can't pinpoint anything.....ideas????

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Old 08-11-2011, 09:29 AM
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According to my book, Ford was still using expansion valves on some of these. Did you check to see if A) Your rigs have them and B) Are they working properly?

I was under the belief that the Oriface Tube Valves were used to replace the expansion valves. Don't know if that's true or not, but I know that the later model GM Yukons and Suburbans that I've worked on do not have any expansion valves. Just wondering of Ford uses both, how that will work...
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Old 08-11-2011, 11:21 AM
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Yes, on these rigs, there is an orifice tube for the front A/C, and the rear unit has an expansion valve, and yes, they do go out a lot, however, the rear unit is aftermarket, and its working fine back there, the front on this specific one has been kind of an on-going issue

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Old 08-23-2011, 04:39 PM
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Ugh!!! So I had to jump of that A/C problem to handle a few other issues with other rigs...jump back on it and find out that the guys whom it was sent to, broke the compressor field coil plug, truck side connector still intact, so I sent it back for them to warranty the compressor, so I get it back and I get some very strange readings, not to mention it was overfilled with freon by about .75lbs.

Anyway, open up the orifice tube line to get a visual of it, only to find it missing, or so I thought...I removed the evaporator and find not only was the orifice tube installed backwards and jammed way too far into the line entering the evaporator and was bent to hell, but it was a GM orifice tube.... :doh

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Old 08-23-2011, 04:55 PM
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Dont know about yours but when mine went hot/cold my buddy removed a shim between the compressor and magnet clutch. it brought the magnet closer to engage the compressor. said next step will be new compressor but it bought me time...good luck
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Old 08-23-2011, 05:57 PM
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Old 08-23-2011, 05:59 PM
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Is your compressor the newer type (08 and up) ??? I haven't replaced one yet, myself, nor taken one apart...I'll keep that in mind

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