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My 1994 camaro is going to get A/C again. what I was surprised by is the fittings on the evaporator fan (TXV) on the firewall are metric Oring fittings. Not metric insert fittings. seems impossible to find a fitting that will fit the evaporator fan to make custom hoses. the fittings are 22x1.5 for the top port and 20x1.5 for the bottom port. All A/C systems are apparently SAE and the dash -8 and -10 are not AN fittings. I don't know if GM used the metric TXV valve only in the fbody. Has anyone dealt with this on either a camaro or other GM chassis.
The good news is I can replace the evaporator to match a later fbody, but that is spending 6 hours taking apart the dash and having done that a few times, it's a lot of work. Ideally I can buy the adapters somewhere. My goal is to run all LS components with the custom hose fittings tot he evaporator I have stock. any suggestions on fittings? Cold hose told me they don't have the Metric Oring fittings.
I thumbed through rock auto and see your problem
93-95 3.4L V6 Fbodys used this style hose and had a unique evaporator core to match. Everything else is a standard metric fitting or GM bolt on block
For this, you're going to be forced to cut/weld or change the evap core
right, those are the fittings, my car was a lt1, but the threads are the same i believe. my only other thought is if there is another evaporator that has SAE threads that I can put in. I know this one is 1.5ton with 7 degrees super heat so if I can find one of these from another car that has SAE feeting, maybe I get lucky. Just don't feel like ripping out the dash again to change this evap.
Last edited by merim123; Jun 17, 2026 at 04:40 PM.
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metric A/C expansion valve fittings 
