Testing A/C components

Camino LS6 · Posted: Sat Jul 26, 2008 3:16 pm Post subject: Testing A/C components

I'm close to dealing with the A/C on my project and am wondering if there is a way to test things before re-assembly. Specifically, I am wondering about the drier (I think that's the right term) - the previous owner capped the connections when he removed the original engine. What I would like to do is test the thing before I go to the trouble of re-installing it and sealing the A/C box around it - I'd hate to have to tear it apart again afterwards.

I'm no A/C expert, so any input would be appreciated.

CoyoteOn2 · Posted: Sat Jul 26, 2008 4:10 pm Post subject:

If the system has been apart for any time at all ~~~ recomend you replace the reciver/dryer, expantion valve, and have the condencer tested/cleaned or replace it also. Be sure you pressure test and evacuate the system before charging. Another point of intrest would be the Compressor ~~ systems that are down for a period of time tend to DRY OUT seals.

_________________
http://elcaminocentral.com/gallery-album_CoyoteOn2s77Cage.html

Keep the Shiney Side Up
The Rubber Side Down !!
aka Larry

Camino LS6 · Posted: Sat Jul 26, 2008 8:20 pm Post subject:

I was afraid I'd hear something along those lines.

Thanks for the input.

Mr86Camino · Posted: Mon Jul 28, 2008 1:54 pm Post subject:

The good news is a dryer is fairly cheap. Replace the orifice tube and all the o-rings. Add the proper amount of oil and pull a vacuum. Let it sit for day and see if the vacuum readings stay the same. If you can find a nitrogen supply pressure the system with dry nitrogen and see if you have any leaks. Then pull the vacuum again and pressurize with the refrigerant. None of the work is difficult but you will need the proper tools and equipment.
_________________
1986 El Camino
1985 Porsche 911
2008 Infiniti G35X (wife's car)

Camino LS6 · Posted: Mon Jul 28, 2008 5:49 pm Post subject:

Thanks again.

I think I'll have all of that done in a shop that has the right equiptment.

But I guess I'll buy a new dryer first since I really need to get the firewall buttoned up and this thing is a roadblock for that. I'll probably re-assemble everything and then turn the shop loose on it to get it up and running.

Any sources for new parts that could save me a few bucks?

TRIK-56 · Posted: Mon Jul 28, 2008 7:00 pm Post subject:

You might want to give DiscountACparts.com a look.
_________________
Bobby
56 Chevy 2-door sedan
82 El Camino Conquista

Camino LS6 · Posted: Mon Jul 28, 2008 7:21 pm Post subject:

Thanks for the lead. Cool

Camino LS6 · Posted: Tue Jul 29, 2008 5:14 pm Post subject:

Been researching all of this for hours now, I'm thinking of going with a new Dryer/ accumulator/expansion valve that converts the system to one that cycles. There is a place out of Texas that has it on ebay. If I also buy a compressor from this guy, it will cost me less than going with the oem replacement stuff and risking the new components with a compressor of unknown age. The dryer/accumulator thing itself is a bit pricey, but with a compressor it will cost me about the same as the cheap compressor from discount air and the oem-style dryer.

So, I think I may try this Texas deal and flush the evaporator, hoses, and condensor. Replace the O rings, add oil, and assemble the system. At that point, I'll have the shop charge and test it.

Sound like a good plan to you guys?

Also, I'm guessing that I'll have to add oil to the evaporator before I install it on the firewall? I ask this because I want to get the firewall finished so that I can assemble the front end of the car (inner fenderwells etc.). The A/C box needs to go in first to do that, so the evaporator does as well. I want to have that part of things done and just cap the connections until I'm ready to do the rest of the system.

CoyoteOn2 · Posted: Tue Jul 29, 2008 7:17 pm Post subject:

When you have the system charged, THEY will add the oil to the system, just let them know it's a new system install.

_________________
http://elcaminocentral.com/gallery-album_CoyoteOn2s77Cage.html

Keep the Shiney Side Up
The Rubber Side Down !!
aka Larry

Camino LS6 · Posted: Wed Jul 30, 2008 12:02 pm Post subject:

CoyoteOn2 · Posted: Fri Aug 01, 2008 7:46 pm Post subject:

YOU ARE CORRECT. In re-reading your post and seeing what you want to do, ADD THE OIL to the components that you wish not to be
dis-manteled. Sorry I wasn't more clear on that.

_________________
http://elcaminocentral.com/gallery-album_CoyoteOn2s77Cage.html

Keep the Shiney Side Up
The Rubber Side Down !!
aka Larry

Camino LS6 · Posted: Sun Aug 03, 2008 11:41 pm Post subject:

Thanks for the confirmation. Cool