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Thread: Charging Air Conditioning System

  1. #121
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    Re: Charging Air Conditioning System

    Its summer time again and wanted to top off my AC with R12.
    Blows nice and cold when driving, not so much while setting still.

    the first post has link to R12 for sale on ebay,
    the last few posts in this thread talk about Redtek so searched it.
    https://www.ebay.com/itm/RED-TEK-12a...frcectupt=true

    I'm uncertain of how everyone says the R12 and R134 are not interchangeable and then we have bottles that say they are good replacements for both.
    Even with the designation R12a R134a, doesnt make sense to me.


    I could make a quick road trip.
    https://oklahomacity.craigslist.org/...875745735.html

    How is everyones Ac running the start of this summer?
    I was a member for 2 years before I bought my van.
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  2. #122
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    Re: Charging Air Conditioning System

    If it blows cold when driving, that's about all you can expect. On these older systems, while sitting still you're not getting good air flow through the condenser, nor are you running the compressor at sufficient rpm, so it's not going to dump nearly as much heat (we all deal with that). If you put it in neutral and rev the engine above 2k RPM, then it should start working better, but it's really designed for doing it's job @ cruising speed with turbulent air (from moving) passing through the condenser. Personally, if it's cooling, I wouldn't "top off" unless I saw bubbles in the sight glass or I could see a pressure issue from a gauge set. Regarding other types of refrigerant, I've only used R-12, so I have no experience with the other stuff........perhaps one of the other guys will chime in.

    So far (knock on wood), my AC has been working flawlessly since I reworked it in Aug of 2017 (as documented earlier in this thread). Good luck with yours . Tim

  3. #123
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    Re: Charging Air Conditioning System

    Took me this long to check my system, while sitting still, @2k RPMs blows cool, no bubbles in sight glass, RPMs @ 3K started to see bubbles in sight glass, which agrees with above statement. Gotta be at cruising speed to enjoy A/C the system will need to be circulating rapidly. Also means Im not sufficiently low on R12.
    Thanks Tim,
    as that silly post that shows a generator and window unit on a car, I have now decided to try the air cooler, which looks to be a ice chest with a fan one it. Blows cool ice chest air. I have a over priced Yeti I can convert. These Sucklahoma summers can be very hot and muggy. And I travel with all 8 seats full and would like them to be comfortable.

    https://youtu.be/ITtlxjvLQis

    Ill set it in the way way back, strap her down and run it off battery power, or the back seat cigarette lighter.

    If if anyone is already doing this post up.
    I was a member for 2 years before I bought my van.
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  4. #124
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    Re: Charging Air Conditioning System

    IMHO an ice based or 12V based cooler with a fan is a joke. There is no way you'll get the kind of BTU's needed to cool the interior of a van. Yes, I saw the guys thermometer with ~40 output temp, but he doesn't show ambient (inlet) air temp. I'm guessing he pulled that thermometer out of a fridge shortly before taking that video.

  5. #125
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    Re: Charging Air Conditioning System

    Just curious if anybody has gone this route???

    I'd like to revamp my system and for this price it can't NOT be worth a try...

    https://www.amazon.com/Enviro-Safe-R...WXS93V2VR5H32G

  6. #126
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    Re: Charging Air Conditioning System

    Looks to be along the same lines as the Redtek

  7. #127
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    Re: Charging Air Conditioning System

    Quote Originally Posted by Flecker View Post
    Just curious if anybody has gone this route???

    I'd like to revamp my system and for this price it can't NOT be worth a try...

    https://www.amazon.com/Enviro-Safe-R...WXS93V2VR5H32G

    Interesting, its got 9 reviews and they are all good.
    Go for it and post up.
    I was a member for 2 years before I bought my van.
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  8. #128
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    Re: Charging Air Conditioning System

    Quote Originally Posted by Andywear View Post
    Interesting, its got 9 reviews and they are all good.
    Go for it and post up.
    Already ordered... I'll guinea pig this one.

  9. #129
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    Re: Charging Air Conditioning System

    So I got the kit today... comes with 3 cans of r134a replacement with dye (says it can be used in R12 OR R134a system). Also comes with a can of proseal, in case of a leak I am assuming. And 2 cans of oil charge that says it's compatible with mineral, ester and pag oils. Lastly it comes with a fill hos/ gauge that fits on R12 systems low pressure port side... should be everything I need.

    I won't be using the oil charge or proseal initially... I will just start with a can of the R134a "replacement" on the low pressure charge port and see where my pressure is. Kinda nice to have a dye present to make any leaks in the system obvious.

    I did order a new fan clutch also because I have noticed my temp gauge starting to creep a wee bit above the halfway mark lately. When I went through the cooling system it's the one component that didn't get replaced, and after testing it the other day it's obviously tired and no longer functioning properly. So that will be a mandatory repair prior to fiddling with the A/C system. Don't want to press my luck and risk an overheat whilst getting the A/C dialed in. Will be a few more days before I can get to it, but will report back when I do!

    My Van is a 4x4 so I had some fun locating the low pressure port and sight glass... lol. This is where I miss the pickup truck ease of A/C maintenance. lol, I never had to crawl under a rig to charge the A/C before.

    Will post back with my results!
    Last edited by Flecker; 07-13-2019 at 01:30 AM.

  10. #130
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    Re: Charging Air Conditioning System

    OK, Update time.

    Replaced the fan clutch (That was fun). I'm not a tiny guy at 6'1 and fat fingers, so it was like the monkey and the football of course. Anyways, that SIGNIFICANTLY improved my cooling!
    Added 2 cans of the envirotek and Wha-La! Running at a cool 53 degrees! just idling at 2k rpm's and the temp sat right in the center while sitting. Couldn't be happier, especially with the temp at 87* the whole time.

    This was a (two dancing banana) job with the A/C charge and the fan clutch...


    One Question though, in looking at the chart based on temp/ pressure... I started at around 18 psi @ 85*. Finished the second can right around 30 psi @87... Seem right? The chart called for like 38 psi but I don't feel comfortable adding that much stress to the R12 system, so I'm guessing it was a happy compromise. Seem legit?

    Edit: Took the Van for about a 45 minute drive around town and through the woods just to see how it's cooling (from both the A/C and the coolant temp) and it did REALLY well! The A/C gets the cab nice and cozy with the outside temps at roughly 90 today... bit of a heatwave blowing through my part of AZ this week. The temp gauge (however reliable that 32 year old mechanism is) was at the halfway mark with the A/C running full blast and mixed driving. Not to shabby! SO, in conclusion, I am guessing the envirosafe stuff is as adequate as the redtek and at a bit cheaper cost! Will be good to have A/C for this weekends camping adventure!
    Last edited by Flecker; 07-15-2019 at 04:56 PM.

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