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On a 79 elcamino I replaced the compressor and hoses. The new compressor does not have the plug in on the back end 1 wire round plugged in to a single post.
Do I go get the correct pump or what ? It has no pressure switch at collector
 

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I HAD THE SAME THING WITH MY 79/305.. WAS ADVISED ON HERE TO GROUND THE WIRE THAT PLUGGED INTO BACK OF COMPRESSOR AND I DID.. A/C WORKING FINE NOW IN OUR 95-100 SUMMER HEAT WAVE.. HOPE SOMEONE KNOWLEGEABLE WILL CHIME IN SOON.. GOOD LUCK WITH YOUR 79..
 

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1979 El Camino (yellow), 1979 El Camino (blue)
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Just a guess, but can you move the pressure switch from the old compressor to the new compressor?
 

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On a 79 elcamino I replaced the compressor and hoses. The new compressor does not have the plug in on the back end 1 wire round plugged in to a single post.
Do I go get the correct pump or what ? It has no pressure switch at collector
Did you remove the snap ring and plug and install your old switch or a new one on the compressor?
 
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