Getting ready to put the AC back together, pulled out the 2 compressors I have The one on the left, looks rough, but seems to work much better when turned by hand. I believe it came off a 72 Riv, The one on the right looks much better but I could not get it to compress/suck as good even with a drill on it and holding my finger over the holes. I believe its from a 75 Lesabre. But my question is... what is the extra port/valve thingy on the left compressor? Does it make a difference?
The one on the left is the sensor for low freon and shuts off the compressor by blowing the fuse that is on the harness that goes to the front of the compressor....1972-up had them. If you don't have the sensor wire for your 70 model...don't worry about it. ---------- Post added at 06:24 PM ---------- Previous post was at 06:03 PM ---------- If you are changing to R134...make sure you get the green o-ring kit....black rubber o-rings are not compatible with R134
Re: 2 compressors, one is different.. whats this extra valve/port? Curtis, Before you go to the trouble of installing that compressor send it to Classic Auto Air in Tampa for a rebuild. Have them put the neoprene seal in it so it wont sling oil all over the underside of your hood. I have 3 "New" reman compressors here and all of them sling oil. The seals are supposed to leak to keep them lubricated. Back in the day no one cared about a mess under the hood.
That's the "superheat" switch. As George has pointed out, it is for later years and may not be used on your car. It is a protection feature for when you AC is low on refrigerant, but can be used on the older cars. Look at the compressor behind the pulley(s), and if it isn't all oily, you can just put it on. If it's all oily, or if there is an oil stripe under the hood of the car it came from, replace the seal as Briz has pointed out.
