A/C compressor cycles in all positions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crawdad · 11-15-2007, 02:48 PM

Saw another thread similar to the question I'm wanting to ask, but thought I'd start another thread. My AC compressor cycles in every position except off. I knew they were suppose to in the defrost position, but I didn't think they were suppose to in Heat, Vent, ...every position except off. What's going on here and has anyone tackled a similar problem before. What's the fix?

Malo83 · 11-15-2007, 02:57 PM

Sounds like a bad Pressure Cycling Switch, the switch is mounted on the Accumulator.

Slonaker · 11-16-2007, 02:02 PM

I think your dash controls are bad. Mine runs the compressor when it is on vent. I have a new set of AC Delco controls. One of these days I will install them and see if it fixes it.

Slonaker

crawdad · 11-16-2007, 05:22 PM

Quote:

Originally Posted by Slonaker

I think your dash controls are bad. Mine runs the compressor when it is on vent. I have a new set of AC Delco controls. One of these days I will install them and see if it fixes it.

Slonaker

How hard of an install is this. Do you have to fool up with a lot of vacuum lines or is it pretty straight forward?

Slonaker · 11-17-2007, 09:55 AM

I think the vacuum lines come off in groups, but I'm not sure. I haven't done it yet.

Slonaker

firedrag79 · 11-17-2007, 12:49 PM

The control is pretty straight forward to replace.... once you can get to the back of it. The vacuum hoses should come off as one unit and can only go on one way. There were 2 lock type washers (for lack of the proper term) that hold them on. I just got done switching mine out of my old 85.

11-15-2007, 02:48 PM	#1
crawdad Senior Member Join Date: Sep 2004 Location: Georgia Posts: 614	A/C compressor cycles in all positions Saw another thread similar to the question I'm wanting to ask, but thought I'd start another thread. My AC compressor cycles in every position except off. I knew they were suppose to in the defrost position, but I didn't think they were suppose to in Heat, Vent, ...every position except off. What's going on here and has anyone tackled a similar problem before. What's the fix? __________________ 2012 Silverado LT 1500, 5.3, 6 speed auto '86 SWB C-10 Silverado

11-15-2007, 02:57 PM	#2
Malo83 Cruzzzn' Vet Join Date: Jan 2005 Location: Porterville,Ca. Posts: 1,918	Re: A/C compressor cycles in all positions Sounds like a bad Pressure Cycling Switch, the switch is mounted on the Accumulator.

11-16-2007, 02:02 PM	#3
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	Re: A/C compressor cycles in all positions I think your dash controls are bad. Mine runs the compressor when it is on vent. I have a new set of AC Delco controls. One of these days I will install them and see if it fixes it. Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

11-17-2007, 09:55 AM	#5
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	Re: A/C compressor cycles in all positions I think the vacuum lines come off in groups, but I'm not sure. I haven't done it yet. Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

11-17-2007, 12:49 PM	#6
firedrag79 Registered User Join Date: Apr 2006 Location: Lubbock, TX Posts: 62	Re: A/C compressor cycles in all positions The control is pretty straight forward to replace.... once you can get to the back of it. The vacuum hoses should come off as one unit and can only go on one way. There were 2 lock type washers (for lack of the proper term) that hold them on. I just got done switching mine out of my old 85. __________________ 1988 Crew Cab SWB project



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