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May 26, 2018 | 12:25 AM

Milner57

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Ac questions

so within the last week I have replaced everything except for the lines on my ac unit. I went to charge it today and my clutch engaged immediately engaged with no Freon in it. It was idling just fine with the clutch on. I went to leave a couple hours later with out realizing that I still had the ac turned on with my lights on and I completely lost all power. Any suggestions as to what might cause this? 1991 f350

May 26, 2018 | 01:30 AM

mebe2k

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Joined: Dec 2003

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From: Ford, WA

Maybe one of the fuse links that go to the starter relay burned out..had this happen on a couple of my old trucks..Or sometimes they just corrode and fail..

May 26, 2018 | 05:53 AM

tjc transport

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From: Marlboro Mental Hospital.

welcome to FTE.
it sounds to me like you jumped the low pressure switch, or have a bad low pressure switch. the ac clutch should not be powered with a dry system .

May 26, 2018 | 09:30 AM

genscripter

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From: California

DEFINITELY STOP running that engine off the clutch is engaging while dry. Oil will not circulate in the system and compressor, creating damage to the compressor.

disconnect your low side switch and see if that stops the engagement of the clutch.

May 26, 2018 | 12:09 PM

Milner57

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So I disconnected the switch and that made it disengage. Does that mean that the low pressure switch is bad?

May 26, 2018 | 01:34 PM

tjc transport

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From: Marlboro Mental Hospital.

sure sounds like it to me.with a dry system the low pressure switch should be open, not closed

May 26, 2018 | 02:52 PM

Milner57

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Alright I’ll try that out and see if it fixes it. Thank you

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May 28, 2018 | 02:08 PM

tjc transport

i ain't rite

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From: Marlboro Mental Hospital.

what is you idle set at?

May 28, 2018 | 05:16 PM

#10

Milner57

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Well I went back to where I had it charged and they had overcharged it which was causing the ac clutch to lock up. Took just under half a pound out and running rust fine now