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Joined: Nov 2000
Posts: 2,481
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Joined: Nov 2000
Posts: 2,481
So what I have concluded is the 4 pin square connector is a junction, one side feeds +12v to the HVAC switch in the car & returns in one of the other 3 wires (only 3 of the 4 used) to energize the compressor, which is the bottom left connector. And the round connector is a pressure switch in the power steering line, if at full lock & high pressure, the AC kicks off as to not bog down the engine & possibly stall it.

Joined: Jun 2009
Posts: 109
D
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Joined: Jun 2009
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Wow, This is a good thread and a lot of good info.


87 Monte SS,built a 383,with a 70's block.all forged.Hamburger oil pan.Patriot 190 heads.2004r trans.Hedman headers coated ,
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