A/c clutch not engaging
Thread Starter
Junior Member
Joined: Apr 2025
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A/c clutch not engaging
I inheritance an 06 f150 lariat
and also the non a/c issue.
From inside the cab the a/c compressor on and off button doesn't engage clutch.
question? does the clutch engage comamnd travel to high pressure switch.
thank u.
and also the non a/c issue.
From inside the cab the a/c compressor on and off button doesn't engage clutch.
question? does the clutch engage comamnd travel to high pressure switch.
thank u.
2004 F150 5.4 Lariat
Joined: Dec 2012
Posts: 956
Likes: 156
From: Summerville, SC
Yes.
In addition to checking the static AC high and low pressure, if you have a voltmeter or 12 volt test light, you can check the power at the Compressor wire connector. One of the wires there should have 12 volts between it and ground when the AC is turned on. The result of this test will determine the next thing to test
In addition to checking the static AC high and low pressure, if you have a voltmeter or 12 volt test light, you can check the power at the Compressor wire connector. One of the wires there should have 12 volts between it and ground when the AC is turned on. The result of this test will determine the next thing to test
Thread Starter
Junior Member
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Yes sir system is full and cools like the artic when clutch is engaged manually. But prefer not to travel that way. Electrical mechanics have told me the engaged command isn't reaching high pressure sensor. And can make it function correctly for $1050.00. Idk. Thank you for your time y'all.
Thread Starter
Junior Member
Joined: Apr 2025
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Idk sir. Is there a relay or switch between a/c engage button in cab to high pressure switch?
all new pressure switches
compressor
Dash control unit from ebay
Used pcm from NJ with keys
04 factory stereo unit
im no expert. What was said to me i understood
high pressure switch controls a/c clutch engage disengage for cycling". High pressure switch may not be receiving engage command from with in cab sir. Pls advise.
all new pressure switches
compressor
Dash control unit from ebay
Used pcm from NJ with keys
04 factory stereo unit
im no expert. What was said to me i understood
high pressure switch controls a/c clutch engage disengage for cycling". High pressure switch may not be receiving engage command from with in cab sir. Pls advise.
2004 F150 5.4 Lariat
Joined: Dec 2012
Posts: 956
Likes: 156
From: Summerville, SC
Yes sir system is full and cools like the artic when clutch is engaged manually. But prefer not to travel that way. Electrical mechanics have told me the engaged command isn't reaching high pressure sensor. And can make it function correctly for $1050.00. Idk. Thank you for your time y'all.
So it's definitely an electrical issue. Before taking the time to review the circuit, are you wanting to fix it yourself?
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Senior Member
Joined: Jan 2020
Posts: 4,330
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From: utah
A couple questions, do you have the manual a/c control with *****, or the automatic digital unit with buttons?
I have the wiring diagram for 05 in PDF format so I'll take a look. Seems like the relay and it it's socket is where I would concentrate and is there a diode for the clutch circuit also if memory serves?.
I have the wiring diagram for 05 in PDF format so I'll take a look. Seems like the relay and it it's socket is where I would concentrate and is there a diode for the clutch circuit also if memory serves?.