That little switch on the back of a R4 compressor - Third Generation F-Body Message Boards

85 ZXX · 11-18-2009, 03:31 AM

On my 85 TPI Z28 I have a 2 wire plug (dk green/white and Lt blue/black wires) that is suppose to connect to a switch on the back of the ac/compressor. I'm just not sure which switch I'm suppose to have...There are three options: 1- High pressure, 2-Fan, 3-Low pressure...Can anyone advise on this? Thanks!!!

85 ZXX · 01-13-2010, 02:26 AM

Well, after doing some digging and testing on the car...It was for a low pressure switch. it ties in with the low pressure cycle switch on the a/c drier. For now, I just tied the two wires together so my cycle switch will work the compressor.

NINÅ · 01-13-2010, 02:15 PM

That’s the overpressure switch the - purpose of the overpressure switch is to turn the compressor off in case of overpressure.

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If People Drove Any Slower They’d Be Going Backwards

When you see fog lights on in good weather beware. Low performance driver ahead.

How bout those nitwits too scared to drive without headlights in the daytime,

and the nitwits that need headlights for a little rain

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85 ZXX · 01-14-2010, 01:18 AM

Thank-you for the response. I found this on the web recently.

Here is the link http://www.hermantorres.com/SEARCH/SW/GM_SW_illus.html