A/C Relay Location on 99' F350 PSD - Ford Powerstroke Diesel Forum
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Old 04-28-2009, 11:42 AM
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A/C Relay Location on 99' F350 PSD

My A/C has a good charge but turns off after running for 20 minutes, then comes back on in 10 minutes and just does this as long as it is on, I assume the relay is bad but I can not find the A/C relay.

Can someone tell me where the relay is?

Has anyone ever had this problem before?
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Old 04-30-2009, 12:14 PM
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Anyone recommend a manuel to find the relay location?

Anyone have any ideas on the relay location?
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Old 05-01-2009, 07:38 PM
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there is no relay. what you want to check when ac quits working you want to see what your pressures are reading. you could be dealing with just a bad connection or you could be dealing with you orfice tube be plugged causeing high pressure.
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Old 05-04-2009, 09:21 AM
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Thanks for responding. I will check my pressure and pressure sensors etc.
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Old 05-04-2009, 09:26 AM
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just a thought

my a/c pressure sensor on the compressor was bad,so i replaced that, but the connector seems to be somewhat loose so my compressor clutch won't kick on and blow cold air unless i jiggle the wire or zip tie it just right. other than that, it's some dang cold air. so i know the charge is good.
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Old 05-19-2009, 02:29 PM
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it could also be excessive compressor clutch gap... should be about .20 or so i believe.. like the thickness of two business cards... next time the a/c isn't running tap on the clutch quickly witht the engine running and see it it engages..also if that does work give the pressure switch, on the accumulator a lil love tap...
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