A/C problem - Ford Powerstroke Diesel Forum
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Old 07-20-2013, 05:07 AM
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A/C problem

I feel like I cannot win lately. Just Finished my EBPV delete buttoned everything up and went for a test drive everything worked amazing. Like a whole new animal! But now my a/c is no more. My clutch is not engaging. Fuse is good. tapped front of clutch with a/c on and no engagement. Compressor spins freely. Jumped low pressure line, nothing. I'm coming to a loss right now can anyone give me some more troubleshooting steps?! The Haynes manual is about worthless and every thing on the net is about an intermittent clutch operation.
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02 7.3 4x4 excursion
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Old 07-20-2013, 06:40 AM
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Clutch works when power is applied. But I'm not getting power to the clutch.
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Old 07-20-2013, 06:48 AM
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So your output side works. Check your input side. Does power get sent to the relay coil when you go to defrost / turn on a/c?

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Old 07-20-2013, 07:03 AM
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What I meant by "clutch works when power is applied" is the clutch actuated when I jump it. But there is no power going to the plug. The a/c doesn't kick on when it is in defrost either

Where's the relay coil?
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Old 07-20-2013, 07:17 AM
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Ac relay in relay box 4, drivers side, near the firewall. There are 3 relays in it. The ac relay is the large one. See if you can engage the AC coil by jumping the contact side with a fused wire. If it works, check if you have power on the coil side when you turn on the ac .

There are 2 fuses that control this by the way. 10A fuse #10 controls the contact side of the relay, and 20A fuse 23 controls the coil side (and more)

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Last edited by Hauser; 07-20-2013 at 07:20 AM.
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Old 07-20-2013, 07:55 AM
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Does the engine need to be running or will ignition on and ac on work? Jump with a 10amp fused wire?
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Old 07-20-2013, 08:00 AM
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To check the contact side? Engine on or off. Doesn't matter. To check coil side, engine on

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Old 07-20-2013, 08:03 AM
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So i want to jump prong 87 thus causing the clutch to activate, right?
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Old 07-20-2013, 08:14 AM
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Alright end I checked continuity on pins 30, 85 and 87. They're all good.
Pin 86 goes to a/c clutch relay and under that it says powertrain control module. Where's that??
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Old 07-20-2013, 08:23 AM
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Jumping pins 30 and 87 should turn on ac coil
Pins 86 and 85 are the relay coil. 86 has 12V and 85 is grounded by pcm when it agrees to turn on AC
For pcm to turn on AC, it needs to see voltage from AC request button through cycling switch and high pressure switch. If you have power on pin 1, red / yellow trace wire, of the high pressure switch connector, when the AC request button is on, short the connector of the high pressure switch. Pcm will now ground pin 85 of the AC relay, if the engine is on.

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Last edited by Hauser; 07-20-2013 at 08:28 AM.
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