Automotive Air Conditioning Information Forum

I managed to wrap the TXV sensing bulb with a layer of insulation tape (aka cork tape or prestite tape). The insulation prevents the TXV from responding to engine bay and fan-wash temperatures.

http://cjnn.xtremefabricator.com/images/LY6swap/ly6swap1476.jpg

http://cjnn.xtremefabricator.com ...

Thank you Dougflas. Yes my 1970 factory AC system did call for 11oz of mineral oil. The OE application for the compressor (2007+ Silverado) I'm using calls for 8oz of PAG46. Since this is a hybrid system, I'm not sure how much to use.

Here are some considerations:
Evaporator - OE 1970 unsure ...

I decided to get back to work on the AC project.

Here is my to do list:
- Adjust POA valve
- Flush evaporator and POA valve
- Install o-rings throughout
- Install hi pressure switch
- Add PAG oil
- Wire compressor and fan relay
- Install compressor belt
- Evacuate and charge

Starting with the POA ...

Hose Crimping

This weekend I borrowed a Mastercool 71550 AC hose crimper and made all the hoses for the system. Here's what a typical fitting looks like coming out of the tool:

http://cjnn.xtremefabricator.com/images/LY6swap/ly6swap1438.jpg

This tool is very simple to operate. It comes with ...

High Pressure Line

Many years ago I picked up compressor fittings from Docs Blocks just before they went out of business. I got both straight and angle/tube adapters and ended up using a combination: straight on the suction side and right angle on the high pressure outlet. Unfortunately the right ...

Thanks for the info 71403. Out of curiosity, do you know what the ECM does as an anti-slug routine?

Liquid Line

Last night I loosely mounted the drier and started looking at liquid line routing. I was happy to see I should be able to route the line tucked inside the fender and out of sight by using 45 degree fittings on either side of the drier and a 90 degree fitting at the TXV.

http://cjnn ...

bohica2xo wrote:DEC PAG explanation https://www.autoacforum.com/messageview ... adid=17571

bohica2xo wrote:For heater valves on GM stuff I use a vacuum unit, like the AC Delco P/N 155536 It was used on G vans, and P vans from 1990 to 1996.

Thank you for both suggestions! I will look into these.

Here is a look at the exit of the POA valve showing the adjustment screw and lock nut.

http://cjnn.xtremefabricator.com/images/LY6swap/ly6swap1417.jpg

Can someone confirm if the threads are standard direction? i.e. I would turn the lock nut counter clockwise to unlock.

Also which direction on ...

POA Valve Testing

The POA has followed me in storage for the last twenty years, always kept in a ziplock bag in a storage bin of parts for the Nova. It's been moved dozens of times and it's sort of a miracle I haven't lost it. For a long time I was dragging around all the AC-related parts ...