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Search Auto Parts Search Hooking up to nitrogen tank Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> AC Auto Repair Help Forum jjrbus User Oct 22, 2019, 3:56 PM Post #1 of 5 (1567 views) Hooking up to nitrogen tank Sign In Greetings, been long time since I have been here. Long story so I will do the Readers Digest version first. I have a 93 Toyota pickup V6 auto. With lots of help from this forum I converted it to 134a a couple years back and it has mostly worked pretty well. I suspect my expansion valve needs replacing and will want to nitrogen test the system before vacuuming and taking to get refilled. I have 3 AC manifolds, one for 410a and 1 I am 100% sure is for 134a and another old junky cheap one I am fairly sure is for 134a. I could use the cheap junky one but do not trust the fittings on it. My nitrogen tank has what appears to be a 1/4 inch male flair fitting to hook up to. My good Harbor Freight 134a manifold yellow hose will not connect to the 1/4 inch flair and is too big, guessing 5/16 inch female flair. My cheap old junky set yellow hose will attach to the 1/4 male fitting on the nitrogen tank. I though I needed an adapter but I see nothing on the net that is 1/4" female to 5/16" male. Plus I am not 100% sure the fittings on the HF set are 5/16" So simply my HF 134A manifold will not connect to my nitrogen tank, whats a poor boy to do? Hammer Time Ultimate Carjunky / Moderator Oct 22, 2019, 5:21 PM Post #2 of 5 (1560 views) Re: Hooking up to nitrogen tank Sign In Why are you even messing with Nitrogen? Just spend $10 for a can of R134A and use that for leak testing. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. jjrbus User Oct 22, 2019, 5:53 PM Post #3 of 5 (1554 views) Re: Hooking up to nitrogen tank Sign In I have a tank of nitrogen so no need to spend $10. Hammer Time Ultimate Carjunky / Moderator Oct 22, 2019, 5:55 PM Post #4 of 5 (1552 views) Re: Hooking up to nitrogen tank Sign In OK, good luck with that. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. Tom Greenleaf Ultimate Carjunky / Moderator Oct 22, 2019, 10:34 PM Post #5 of 5 (1538 views) Re: Hooking up to nitrogen tank Sign In  134a is $4 bucks already down for the season. Price is "Winterized." Why mess with other gasses for anything to do with this about now? Guessing thread size? Good luck, there's about 5 different ways to make threads in common use then add HF products it's now infinity. Don't forget reverse threaded anything either to complicate that! T   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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