No voltage to the AC signed wire. 78 308

The high and low AC pressure switches are located on the AC Dryer under the front bonnet. Do a search using "AC high low pressure" in the 308/328 section for prior threads with pictures.

PS The stock arrangement is separate high and low switches, but the modern arrangement is a combination high/low pressure switch -- and many cars have been updated to the later style if replacement was necessary.

 

To test the clutch ,even without gas simply place a jumper or the pressure switch(s) wires after unplugging them .
It or both of them are located by the dryer in the front .
You can do this with the ignition on and AC obviously switched on . Then test the V @ the comp wires should be 12 v .
With the clutch connected you should hear it click and be unable to turn the pulley by hand ( engine off btw )

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Low P switch are the green wires so disconnect Andy jump the two brown .This turns it on mimics pressure within spec .


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High pressure switch , jumped ^ To test compressor V and clutch function.

 

If you’re getting no voltage at the AC compressor wire, check the relay, pressure switch, wiring, and system pressure, any of these could break the power path