Air conditioner system

Thanks so much for your quick reply, Wrenchtech! Been looking at videos and reading articles. Some say to dump the oil that comes in a new compressor to check amount, than put back in, some say to add an additional 1/2 oz, some say to put half the oil into compressor, other half into new drier. The kits for my truck come with drier and expansion valve (sites say that is on the firewall, but I do not see it). Some sites talk about a filter or orifice tube, is the expansion valve in place of both of them on my truck? I am also seeing different methods of flushing the system. What do you recommend? Thanks.

Thanks Wrenchtech, Seems most of the kits for my truck come with an expansion valve and they say to replace it, suppose to be before evaporator on firewall, but I do not see it there so wondering if it is inside car (Oyyy). I cannot find any information on location online. So if compressor comes full of oil, than I do not need to add it to drier either by what you are saying. Thanks again so much.

Oh, I just watched a video by Scott Kilmer and he showed one in a Toyota that you had to access thru the glove compartment. So if I find mine there I suppose it is a good idea to replace it, no? Should I remove the evaporator and flush it out of the truck? Thanks.

Wrenchtech, I watched this video and replied before I saw your other answer. I always read up and research before doing any kind of work on cars or whatever so I do them properly, but it does seem like some people cut corners and I guess sometimes they are okay to cut. I really appreciate your help. I see they sell recharges kits at auto stores, but also watched this great video by ChrisFix on youtube of how to use an air conditioner manifold. Wonder if the auto parts stores have that available to rent? Or would the recharge kit be okay to just use. Still need to vacuum out the system well first it seems. Thanks.

There certainly are some crazy videos out there by people who do not know much and do not do a decent video, but he did not seem like that to me. I mean he explained how you cannot try and flush modern condensers which made sense. May I ask why you feel that way? Thanks.

I discovered Autozone does indeed rent out the air conditioner manifold and vacuum to recharge system, but not a flush kit. What would you recommend as the best procedure to flush out my lines? Thanks so much Wrenchtech.

Well that said, should I even disconnect them everywhere to change O rings or only at the compressor and drier? Thanks Wrenchtech. Really appreciate all your quick responses.

Thanks Wrenchtech, I still need to order the compressor. I was thinking of going to Pepboys for their free air conditioner check and suppose they can see if a leak shows up by the pressure? Than ask them to remove the refrigerant. Is it okay to do that now or should I wait til right before I do the job? If the coolant comes out, there would still be oil in line protecting all, correct? Thanks.

So I went to Pepboys, & they asked it if was running warm, I said cools some, but compressor noisy & that said no need to test system. But they did remove it for me & supposedly it was low, they got out 1.3lb. Now online it seems to show I should have 25oz of R134a & PAG100 6.75 oz, however on the tag on hood it says HFC134a 0.65 +- 0.05kg/1.43 +-.11 lb. Nissan Luminous Oil Type R KLH00-PAGR 0 6.8oz/200cc. I spoke with one auto part store that said the Nissan R oil is PAG 46. I want to mention also that I live in hot sunny Tucson, Az. & Have read that you are suppose to run the AC system every month even in winter even for a few minutes so orings stay lubricated & don't dry out causing leaks. I just want things to go smoothly with this job. (I did order the compressor kit today). Any more words of wisdom to help me figure out these fluids? Thanks, Wrenchtech.

Oh, Wrenchtech, I guess the heat is getting me. I was stupidly thinking 1.43 (oz) +-.11 lb. But of course (ding ding light in head), 1.43 lb +-.11, so getting 1.3 out of it really was not that far off.13 & his gauge could have been off, or how he read it, I was trying to discuss the tag with him & he said 'Oh, I was looking at it but could not read it'. LOL