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A/C clutch prevents truck from starting
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sparkle
New User
Jul 7, 2012, 1:49 PM
Post #1 of 11
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A/C clutch prevents truck from starting
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1997 Ford F-150, 4.6 V-8, 102K miles.
A/C compressor clutch not engaging. I unplugged the clutch harness from the clutch to check for voltage to the clutch, and the truck would not start. I re-connected the wire and the truck started as normal. With the truck running, I disconnected the clutch wire again, and the truck died.
What could possibly cause these un-related incidents?
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Hammer Time
Ultimate Carjunky
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Jul 7, 2012, 2:49 PM
Post #2 of 11
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Re: A/C clutch prevents truck from starting
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Are you sure it's the clutch wire that you're disconnecting?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
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Jul 7, 2012, 3:15 PM
Post #3 of 11
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Re: A/C clutch prevents truck from starting
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Probably unplugging the crank sensor.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 7, 2012, 4:05 PM)
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sparkle
New User
Jul 7, 2012, 3:36 PM
Post #4 of 11
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Re: A/C clutch prevents truck from starting
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The wire is on the compressor, directly behind the pully that drives the clutch.
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Discretesignals
Ultimate Carjunky
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Jul 7, 2012, 3:46 PM
Post #5 of 11
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Re: A/C clutch prevents truck from starting
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What color are the wires on the connector your unplugging?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 7, 2012, 3:48 PM)
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Discretesignals
Ultimate Carjunky
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Jul 7, 2012, 4:04 PM
Post #6 of 11
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Re: A/C clutch prevents truck from starting
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It's really easy to mistaken the crank sensor connector for being the compressor clutch connector. The compressor clutch is right next to the crank sensor.
crank sensor
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 7, 2012, 4:04 PM)
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Hammer Time
Ultimate Carjunky
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Jul 7, 2012, 4:18 PM
Post #7 of 11
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Re: A/C clutch prevents truck from starting
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It has to be the Crank sensor. It certainly not the A/C compressor doing that.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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sparkle
New User
Jul 7, 2012, 7:33 PM
Post #8 of 11
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Re: A/C clutch prevents truck from starting
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I'll verify tomorrow..you have me convinced it must be the crank sensor, but then what is most likely causing the clutch to not engage? The refrigerant chage is OK.
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Hammer Time
Ultimate Carjunky
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Jul 7, 2012, 7:36 PM
Post #9 of 11
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Re: A/C clutch prevents truck from starting
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That could be dozens of things. You will have to follow a wiring diagram to determine the cause.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
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Jul 8, 2012, 3:38 AM
Post #10 of 11
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Re: A/C clutch prevents truck from starting
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Quote ">>but then what is most likely causing the clutch to not engage? The refrigerant charge is OK.<<"
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The most likely reason for clutch NOT to engage would be low - VERY low charge but also a whole list of reasons as well. You don't know if there's enough refrigerant - you can't without removing it and weighing it. No silly on can pressure, color chart sold in the same stores with with the crayons is going to tell you how much which is what I'm guessing.
Other popular reason is clutch air gap too large. Try a common biz card in the gap or check for close to .020 gap. A card folded shouldn't fall out - all that without tools.
If it does (folded biz card) with A/C in request (with all caution!!!!) tap on outer plate and if it kicks on the air gap is too large to pull in on it's own.
I'm worried as if you are disconnecting a crank sensor and not the plug to clutch coil you should probably send this out before something gets destroyed,
T
(This post was edited by Tom Greenleaf on Jul 8, 2012, 3:39 AM)
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sparkle
New User
Jul 8, 2012, 9:06 AM
Post #11 of 11
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Re: A/C clutch prevents truck from starting
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Thanks for the advice..guess I'll schedule a visit to the shop this week.
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