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Old 07-06-2010, 19:23   #1 (permalink)
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2006 Expedition AC

2006 Expedition AC I have a 06 Expedition 5.4 with rear air. I purchased it with 55k on it a few months ago. They last two days I noticed that not only has the AC thumped when I start the car but the rear compressor makes a hissing noise. I put a can of R134a in it and both seem to have gone away.

My AC however does not seem to be as cold as one would expect however. Before my AC refill I was sitting at about 20PSI on a 95 degree day. I am now sitting at 45PSI. The can I put in was a stop leak ring conditioner with 11oz of R134a and 1.5 ounces of oil and stop leak.

Any suggestions?
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Old 07-06-2010, 19:37   #2 (permalink)
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Re: 2006 Expedition AC

I think you are just a tad overcharged. Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI. Remember, the lower the pressure the better the cooling (to a point). Shoot for 30PSI
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Old 07-08-2010, 17:09   #3 (permalink)
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Re: 2006 Expedition AC

You think so? The bottle I have has a Ambient Temp meter. It states 25-35psi at 65degree. It goes up with the ambient temp. At 100degree it states PSI should be 50-55. I think perhaps I have a leak?
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Old 07-08-2010, 17:41   #4 (permalink)
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Re: 2006 Expedition AC

The ambient temp (measured 2 inches in front of condenser) of 90-100F should show a low pressure reading of 25-43psi with a 165-270psi head pressure and a temp of 40-65 degrees at the evaporator.

I still say you are a tad overcharged. If you'll get the low pressure reading down a little, you'll see a decrease in temp at the evaporator.
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Old 07-09-2010, 07:52   #5 (permalink)
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Re: 2006 Expedition AC

Well here is the thing. I was " invited " to post on your problem. How do you know your ac was low ? Maybe it wasn't but the TX was plugged causing low head and low cooling ? How do you know it needed 1.5 oz of oil ? Maybe it is now oil slugging as in
over full ? Your biggest mistake was putting stop leak in your system. Save your money for a new compressor in the future. To properly charge an A.C. system is complete evacuation dump all oil and measure it. Now add the proper amount of oil and complete
pressurization with nitrogen for one hour to test for leaks. If the pressure drops you have a leak. Fix it. It's our law up here. If i do an A.C. in a car it MUST NOT LEAK for
the complete season. If i redo the same car 3 times in less that one year i could lose my license. Compressors don't have rings. Yes you have probably over charged your system
because you have no idea of what is still in the compressor. I love those refill kits.
Do you know how many compressors i've replaced because of over charging and summer
is just starting. Keeps me in lots of money. Ambiant air is supposed to be 75F on a recharge with a large fan blowing into the grill of the car. At 45lbs.back your T.D. across
the coil is approx.47 Degs.F As JWKO says your probably over charged. But is the system
plugged ? Does it have ice in the TX ? Is the accumulator contaminated with dirt or ice ?
Are the suction valves leaking ? Just some info on how we do it. ( have to by law ).
Lower your charge but your not supposed to blow that stuff into the air. How much
charge to take out ? Without the complete evacuation and recharge you will never know.
Good luck. Just one man's opinion.
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Old 07-26-2010, 09:56   #6 (permalink)
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Re: 2006 Expedition AC

Yeah like JWKO says, you're overcharging the system. The high pressure switch will cut off the compressor when it gets too high and it leaves you with no A/C, just blowing ambient air. Put a good gauge set on it and shoot for 30-35 psi low side and 220-240 high side. Good luck.


- Mike
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