The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Factory A/C: POA Valve or Cycling switch?

Davidf · 07-22-2015, 03:41 PM

Not knowing any better at the time, I rebuilt the a/c system in my '71 (did not operate when I purchased the truck) utilizing a POA delete kit. I elected to stay with R12. Well, it took me about 2 miles down the road to figure out I made a mistake. The darn thing causes the compressor to cycle excessively....constantly on/off is more like it. When the compressors cycles off, there is a total and noticeable lack of cooling in the cabin. Also, the constant loading and unloading of the engine is simply annoying.

So, I built a test rig and calibrated my original POA to 29.5 psi and ripped that POA delete tube out and but the POA in where it belonged. Much better, but not perfect. I occasionally get less than cold air out of the vents.

07-22-2015, 03:41 PM	#2
Davidf Registered User Join Date: Nov 2014 Location: Austin Posts: 749	Re: Factory A/C: POA Valve or Cycling switch? Not knowing any better at the time, I rebuilt the a/c system in my '71 (did not operate when I purchased the truck) utilizing a POA delete kit. I elected to stay with R12. Well, it took me about 2 miles down the road to figure out I made a mistake. The darn thing causes the compressor to cycle excessively....constantly on/off is more like it. When the compressors cycles off, there is a total and noticeable lack of cooling in the cabin. Also, the constant loading and unloading of the engine is simply annoying. So, I built a test rig and calibrated my original POA to 29.5 psi and ripped that POA delete tube out and but the POA in where it belonged. Much better, but not perfect. I occasionally get less than cold air out of the vents.