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Thread Tools | Display Modes |
06-21-2004, 10:47 PM
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#1 |
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Registered User
Join Date: Apr 2003
Location: Garland, Texas
Posts: 1,127
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help on Stock A/C on a 78 Big 10
I just bought a 78 Big 10. The big block was removed and replaced with a 305. It still has the stock components and i'm in the process of converting to 134a. Does anyone have a wiring diagram for the ac system? The a/c unit won't turn on and i can't charge it until it does. I know i'm missing the wire that goes to the compressor and want to check to see if i have all the other and if they are run right or not. Also any other tips or help would be nice. Thanks in advance guys.
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06-22-2004, 10:43 PM
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#2 |
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LED King
Join Date: Jan 2003
Location: Sacramento, CA
Posts: 2,087
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The stock green wire comes from the H/VAC panel, into and out the high pressure cut off switch, then goes to both the idle kick up solinoid and the compressor clutch.
__________________
Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32 Last edited by apstguy; 06-22-2004 at 11:23 PM. |
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06-22-2004, 11:34 PM
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#3 |
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Registered User
Join Date: Apr 2003
Location: Garland, Texas
Posts: 1,127
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anyone have a diagram? so i can check all the other wires and fuses and everything
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06-22-2004, 11:43 PM
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#4 |
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LED King
Join Date: Jan 2003
Location: Sacramento, CA
Posts: 2,087
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Hope this helps out...
      
__________________
Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32 |
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06-23-2004, 07:30 PM
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#5 |
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Registered User
Join Date: Apr 2003
Location: Garland, Texas
Posts: 1,127
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yeah that helps a little...shows me what i'm missing
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06-23-2004, 07:33 PM
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#6 |
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Registered User
Join Date: Apr 2003
Location: Garland, Texas
Posts: 1,127
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what's this....and is it on every unit? does anyone have an a/c wiring harness up for grabs for sale?
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06-23-2004, 07:37 PM
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#7 |
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Registered User
Join Date: Apr 2003
Location: Garland, Texas
Posts: 1,127
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guess a pic would help
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06-23-2004, 07:38 PM
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#8 |
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Registered User
Join Date: Apr 2003
Location: Garland, Texas
Posts: 1,127
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ok still didn't work....the connection on the accumulator on the far left...with the wires and white connection.
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06-23-2004, 07:39 PM
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#9 |
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LED King
Join Date: Jan 2003
Location: Sacramento, CA
Posts: 2,087
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high/low pressure cutoff switch.
__________________
Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32 |
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06-23-2004, 07:42 PM
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#10 |
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3 lefts make a right
Join Date: Jun 2004
Location: Texas Hill Country
Posts: 150
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Yep, Low Pressure Valve (LPV)
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06-23-2004, 09:40 PM
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#11 |
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Registered User
Join Date: Apr 2003
Location: Garland, Texas
Posts: 1,127
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alright, i think my LPV is on my high side or liquid line...small line. My accumulator doesn't have a spot for it. now my question is....on the fan switch...the wires leading to it come from behind the ac duct box. and don't have any power to any of them. shouldn't they be coming from the fuse box? somehow at least?
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06-23-2004, 10:01 PM
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#12 |
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Registered User
Join Date: Apr 2003
Location: Garland, Texas
Posts: 1,127
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ok....i jumped power to the fan blower wires....low, high, and med all run...for some reason the harness doesn't have power. where does the harness connect to get it's power?
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