6.4 ac problem please help. - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 06-02-2014, 11:02 AM Thread Starter
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6.4 ac problem please help.

Bought the truck recently and noticed it needed little freon but still blew cool. Drove truck yesterday and just blew air. Looked and ac compressor isn't engauging. Tested the clutch and it clicks so the compressor is good it's just not getting any power. Is there a fuse or anything? Any input would be great!

2008 f250 king ranch ccsb: spartan ndash with sotf, s&b cold air intake, 4" turbo back flo pro exhaust, amp research steps, 8" 4 linkrough country lift, 24x13" fuel Mavericks ptm on 38" nitto trail graps.
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post #2 of 10 Old 06-02-2014, 11:08 AM
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if it has a leak it may be to low to come on.

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post #3 of 10 Old 06-02-2014, 11:29 AM Thread Starter
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We put freon in it today and it didn't even take the whole bottle and still won't come on.

2008 f250 king ranch ccsb: spartan ndash with sotf, s&b cold air intake, 4" turbo back flo pro exhaust, amp research steps, 8" 4 linkrough country lift, 24x13" fuel Mavericks ptm on 38" nitto trail graps.
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post #4 of 10 Old 06-02-2014, 06:38 PM
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mine was doing the same thing when i first bought it, my compressor was leaking, so the dealer told me.

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post #5 of 10 Old 06-04-2014, 04:02 PM
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Im pretty sure PCM controls power to clutch. The PCM may not send power to the clutch if it sees a switch that is out of parameters. Might have a bad cut-out switch, etc..
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post #6 of 10 Old 06-04-2014, 04:37 PM
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Does it only do it while idling or when you are driving down the road.

if i idle it turns to blowing coolish air. then when i get out on the highway its real cold again.
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post #7 of 10 Old 06-04-2014, 05:23 PM Thread Starter
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does not blow cold at all!!! ac clutch will not engauge!!

2008 f250 king ranch ccsb: spartan ndash with sotf, s&b cold air intake, 4" turbo back flo pro exhaust, amp research steps, 8" 4 linkrough country lift, 24x13" fuel Mavericks ptm on 38" nitto trail graps.
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post #8 of 10 Old 06-04-2014, 05:55 PM
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Do you have digital controls?
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post #9 of 10 Old 06-05-2014, 05:01 AM Thread Starter
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no I have the manual controls

2008 f250 king ranch ccsb: spartan ndash with sotf, s&b cold air intake, 4" turbo back flo pro exhaust, amp research steps, 8" 4 linkrough country lift, 24x13" fuel Mavericks ptm on 38" nitto trail graps.
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post #10 of 10 Old 06-07-2014, 03:52 AM Thread Starter
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ended up fixing it. went to my dealer and they printed fuse diagrams and wiring schematics and I replaced all fuses and swapped relay and did nothing. turned all climate controls to off, hot, low then max, cold, max and pushed ac button that was already on and it worked. I now have ac again. thanks guys

2008 f250 king ranch ccsb: spartan ndash with sotf, s&b cold air intake, 4" turbo back flo pro exhaust, amp research steps, 8" 4 linkrough country lift, 24x13" fuel Mavericks ptm on 38" nitto trail graps.
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