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Re: yet another dash AC question [message #274707 is a reply to message #274435]

Wed, 01 April 2015 09:36

JohnL455

Messages: 4447
Registered: October 2006
Location: Woodstock, IL

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Senior Member

If I remember my GM history correctly cycling clutch started in 77. So your comp should stay engaged unless low or high pressure switches open as protection. So far so good. Lack of differential pressure points to the valve. They changed types and name for expansion valve or POA over the years. Obviously adding refigerant will raise the pressures low and high side. How does the low side site glass look as you charge it? Can you see vapor rushing past it? If so I would guess comp is ok. I think Emery said the glass is not accurate as a charge guide with HC12. If it goes clear liquid it is overcharged, unlike w R12. Sounds like you never reach a good point as you added and monitored charge so charge amount would have been good and cold at some point. I would refer to the FSM for your year to understand and diagnose your year's valve system. I think there is a bleed tube and temp sensing to control the throttling of the valve. In other words it's an active valving component, unlike the fixed orifice size and temp control done by cycling the comp on the later years. I'm guessing there is not enough pressure building across the valve. You should hear an RPM drop as you cycle from vent to AC, if only slight then the pump isn't using any horsepower to do work against the restriction. Do Jim Ks techs have any insights using this comp on your year with HC12?

John Lebetski
Woodstock, IL
77 Eleganza II

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[Message index]

		yet another dash AC question By: KB on Fri, 27 March 2015 14:43
		Re: [GMCnet] yet another dash AC question By: emerystora on Fri, 27 March 2015 15:27
		Re: [GMCnet] yet another dash AC question By: biggreen on Fri, 27 March 2015 15:45
		Re: [GMCnet] yet another dash AC question By: KB on Fri, 27 March 2015 15:58
		Re: [GMCnet] yet another dash AC question By: Bullitthead on Fri, 27 March 2015 16:36
		Re: [GMCnet] yet another dash AC question By: KB on Fri, 27 March 2015 16:52
		Re: [GMCnet] yet another dash AC question By: roy1 on Sat, 28 March 2015 00:55
		Re: [GMCnet] yet another dash AC question By: KB on Sat, 28 March 2015 10:36
		Re: yet another dash AC question By: Chris Tyler on Fri, 27 March 2015 19:03
		Re: [GMCnet] yet another dash AC question By: powwerjon on Fri, 27 March 2015 23:02
		Re: [GMCnet] yet another dash AC question By: KB on Sat, 28 March 2015 10:21
		Re: [GMCnet] yet another dash AC question By: emerystora on Sat, 28 March 2015 10:34
		Re: [GMCnet] yet another dash AC question By: Matt Colie on Sat, 28 March 2015 17:45
		Re: [GMCnet] yet another dash AC question By: KB on Sat, 28 March 2015 21:39
		Re: [GMCnet] yet another dash AC question By: roy1 on Sun, 29 March 2015 00:25
		Re: [GMCnet] yet another dash AC question By: KB on Sun, 29 March 2015 11:25
		Re: [GMCnet] yet another dash AC question By: powwerjon on Sun, 29 March 2015 13:20
		Re: [GMCnet] yet another dash AC question By: emerystora on Sun, 29 March 2015 13:50
		Re: [GMCnet] yet another dash AC question By: powwerjon on Sun, 29 March 2015 14:04
		Re: [GMCnet] yet another dash AC question By: emerystora on Sun, 29 March 2015 14:13
		Re: [GMCnet] yet another dash AC question By: USAussie on Sun, 29 March 2015 15:06
		Re: [GMCnet] yet another dash AC question By: roy1 on Sun, 29 March 2015 14:34
		Re: [GMCnet] yet another dash AC question By: Kingsley Coach on Sun, 29 March 2015 07:04
		Re: [GMCnet] yet another dash AC question By: KB on Thu, 13 August 2015 14:45
		Re: [GMCnet] yet another dash AC question By: ljdavick on Thu, 13 August 2015 14:51
		Re: [GMCnet] yet another dash AC question By: bdub on Thu, 13 August 2015 15:07
		Re: [GMCnet] yet another dash AC question By: KB on Thu, 13 August 2015 18:20
		Re: yet another dash AC question By: JohnL455 on Sun, 29 March 2015 18:22
		Re: yet another dash AC question By: Keith V on Sun, 29 March 2015 20:42
		Re: yet another dash AC question By: KB on Mon, 30 March 2015 17:55
		Re: yet another dash AC question By: Adrien G. on Mon, 30 March 2015 22:25
		Re: yet another dash AC question By: KB on Tue, 31 March 2015 12:22
		Re: yet another dash AC question By: Adrien G. on Tue, 31 March 2015 22:30
		Re: yet another dash AC question By: KB on Wed, 01 April 2015 12:31
		Re: yet another dash AC question By: KB on Mon, 30 March 2015 17:44
		Re: yet another dash AC question By: KB on Wed, 01 April 2015 12:37
		Re: yet another dash AC question By: JohnL455 on Mon, 30 March 2015 07:47
		Re: yet another dash AC question By: KB on Mon, 30 March 2015 17:51
		Re: yet another dash AC question By: JohnL455 on Wed, 01 April 2015 09:36
		Re: yet another dash AC question By: KB on Wed, 01 April 2015 12:45
		Re: [GMCnet] yet another dash AC question By: ljdavick on Wed, 01 April 2015 18:18
		Re: yet another dash AC question By: Bob de Kruyff on Wed, 01 April 2015 23:13
		Re: yet another dash AC question By: JohnL455 on Fri, 03 April 2015 08:46
		Re: yet another dash AC question By: Bob de Kruyff on Fri, 03 April 2015 16:08
		Re: yet another dash AC question By: jhbridges on Thu, 13 August 2015 15:59
		Re: yet another dash AC question By: JohnL455 on Thu, 13 August 2015 19:12

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