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Add dye to r12 mineral oil before adding to system?

James89dx on Mon April 30, 2012 8:57 PM User is offline

Year: 1989
Make: Honda
Model: Civic
Engine Size: 1.5
Refrigerant Type: R12

Just like the title says - can I mix dye to the R12 mineral oil before adding it to the system? I'm hoping to this way avoid having to try to "inject" the dye later on.

I'll be (hopefully) putting my new system together this weekend and it would be really convenient if I could just add/mix the dye when I put the oil in the system. I see they make oil for r134a systems that already come with dye mixed in but I can't find anything like that for R12/mineral oil.

TRB on Mon April 30, 2012 9:33 PM User is offlineView users profile

Mixing it in a bottle or mixing in a system really makes little difference.

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mk378 on Mon April 30, 2012 9:35 PM User is offline

You can just pour dye into one of the system lines while it is open. It will mix when the oil starts to flow.

James89dx on Mon April 30, 2012 11:08 PM User is offline

Quote
Originally posted by: mk378
You can just pour dye into one of the system lines while it is open. It will mix when the oil starts to flow.

Cool! Is there a recommended amount to pour in? I assume just an oz or so at most would work?

RobbieP on Tue May 01, 2012 12:06 AM User is offline

Check out this picture some uv dye set ups have little lines on them that show you how much to use per injection. The picture of the dye canister in the injector has lines that show you to squeeze until the next line to test a car.

Once that stuff mixes in, you don't need much that a little squeeze of it.

Edited: Tue May 01, 2012 at 12:09 AM by RobbieP

mk378 on Tue May 01, 2012 9:20 AM User is offline

Use 1/4 oz, maybe even less in a small system such as yours. Anything other than refrigerant in the lines is just getting in the way of heat transfer.

James89dx on Sun May 06, 2012 1:54 PM User is offline

I had actually bought a dye injector kit a month or two ago, and now realize that was pointless to buy since I don't need to "inject" it after the fact since I put it in ahead of time. The kit said to use 1/4 oz of dye for every 10 oz of oil in the system. Since my system only takes 5 oz of oil I used 1/8 oz of dye. I've got the car sitting on vacuum now to verify it holds vacuum (been an hour now, and it's holding steady). I'll charge it this afternoon and then with the dye in the system I'll periodically check for leaks in the coming months

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