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Old 01-13-2011, 12:37 PM
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Anyone an AC expert?

My DD(2006 F250) A/C has always worked great. Didn't use it for a few days due to cold weather. Then it wouldn't blow cold. I bought some HF gauges to see what was going on. Here's the info.

67 degree ambient 2'' in front of condenser
hookup gauges
Engine off
High side- 65 psi
Low side- 65 psi

Engine on
High side-65 psi
low side- compressor kicks on- drops to 15 psi and cuts off
takes 90 seconds to build to 43 psi and engage compressor. Then drops to 15 psi, cuts off and starts cycle again.

Engine just turned off
High side-65 psi
Low side- starts low and slowly climbs to 65 psi and stays balanced with high side.
If checked after sitting a while it matches the high side

Would this indicate a blockage? Maybe in orifice tube?
Cal

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Old 01-13-2011, 03:15 PM
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Not being an "AC guy", I have recharged a few, you're definitely low pressure on the low side. When recharging, the charging operation and readings are done at idle, AC on full, filling/pressurizing to the pressure relative to ambient scale.

Here's a good read that may help:

http://www.aa1car.com/library/ac98.htm
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Old 01-13-2011, 03:56 PM
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System is low. Sounds like compressor is working and so is cycling switch. Needs more freon.You should evacuate the system the recharge so you can be sure that you put in the proper charge amount.
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Old 01-13-2011, 05:32 PM
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Thanks. Will evac and add new refrig this weekend. Label says 2 lbs 10 oz.
Will I need any additional oil?
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Old 01-13-2011, 05:44 PM
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I would not add oil. It is a common mistake to add some oil thinking that it is a good thing. If you replaced a part like a dryer then you would put in 1-2 ounces depending on the size of the system.The system you have was low on freon and most likely did not lose a significant amount of oil.
Like anything else, too much oil is not good.
2lbs 10 ounces = 42 ounces
it should take 3 cans of r 134 (14 ounce can X 3 = 42 ounces)
put in r 134 a . Watch those guys at the parts store, they will try to sell you the stuff with the oil in it, dont buy it. Not that it isnt good, its just not what you need. Dont use anything else no matter what they say. Buy 134 A
I lived in holmes beach for 18 years and did lots af A/C (Anna Maria Island near Bradenton)
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