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  #1  
Old 04-11-2009, 06:25 PM
dethomson
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Is this true?

I saw NumberDummy post this in another forum and wonder if my A/C is toast.
"The A/C may not be any good....if any of the hoses have been removed, if any parts have been removed where freon is a factor.

Once outside air gets into the compressor, condenser, dryer tank or expansion valve, the entire system has to be evacuated within several weeks...otherwise you can kiss these parts goodbye."
I rebuilt my truck 15 years ago and never charged the A/C after putting everything back together. Is it probably toast since it has had air in it for so long? I was going to get it charged up for use this summer.<!-- / message --><!-- sig -->
 
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Old 04-12-2009, 06:48 AM
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Just replace the accumulator/drier as the dessicant has long since saturated.

Pull a hard vacuum on it for at least 30 minutes before charging.
 
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Old 04-21-2009, 09:09 PM
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Depends largely on how much moisture was trapped in the system over time. If it is rusty in the compressor and if it had an expansion valve they may be toast. Reciever dryer as suggested is definitely out.
 
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Old 04-21-2009, 09:28 PM
dethomson
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Thanks guys. I'm no A/C guy...Where's the receiver dryer?
 
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Old 04-21-2009, 09:31 PM
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On a 78 F250? Son I havent worked on one of those Dinos for a LOOOOOOONG Time... just follow the high pressure hose from the AC Condenser... it should lead you there..
 
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Old 04-21-2009, 11:47 PM
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15 years is a long time for a system to be "open".
Much of the interior is raw aluminum which can corrode over time. A good check for corrosion is to disconnect the condenser and blow through it with compressed air. If you see dust blow out, the system will have corrosion issues and closer inspection will be needed. Do the same with the evaporator. You should be disconnecting all of those parts to replace the seals anyway.

The receiver/drier and expansion valve should be replaced, as the other guys have said. Also, change the oil in the compressor if it is the OEM type York unit.
 
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