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Old 07-22-2020, 05:21 AM   #1
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R-12 to R-134 adapter Ford F53

Before I bought my RV, I think it was converted from r12 to r134. It has a tag on the system showing r134, so I think it was done professionally. Recently, the low side valve leaked. I initially thought I could just change the Schrader valve on it, but when I swapped the valve, it was too long to allow the quick connect to engage on the valve. Upon further inspection, the connection looked exactly like an r12 to r134 adapter, https://shop.advanceautoparts.com/p/...E&gclsrc=aw.ds.

So I changed the whole connection. However, when I tighten it, I still have the same problem. The Schrader valve hits the valve on the line. When the adapter is attached, the pressure on the internal valve evacuates the system. Does the F53 require a special long adapter? Or something like this, https://www.amazon.com/Fitting-Retro.../dp/B07R76KH59 with an angle to prevent the pressure on the internal valve?

Thanks!
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Old 07-22-2020, 08:04 AM   #2
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What year is your F53? Ford started using R134A back in the mid 90's.

Pictures would be great too.
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Old 07-23-2020, 12:58 AM   #3
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The A/C system was not supplied by Ford was most likely from Evans Tempcon now Proair. Since you didn't include the year of your Chassis it's hard to tell what line fittings you have, picture would be nice.
https://proairllc.com/design-enginee...empcon-guides/
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Old 07-23-2020, 01:23 AM   #4
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1994 Itasca Suncruiser

It's a 1994.
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Old 07-23-2020, 01:27 AM   #5
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Pics

These are the only pics I have now. Took them trying to see inside the port. First is with the adapter, then with it removed.
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Old 07-23-2020, 08:30 AM   #6
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in 94, Ford was still using R12, so, you do have a conversion kit. My suggestion is to purchase a new aftermarket set of valves. You can get them as cheap as $10.00 on Ebay. https://www.ebay.com/itm/R12-to-R134...UAAOSw1MZZkhQP
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Old 07-23-2020, 05:29 PM   #7
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new valve

The Ebay one looks exactly like the one I purchased. the valve presses against the R12 valve, so it leaks. The R12 valve does move when I test it with a small screwdriver, so it isn't stuck in place. The old R134 valve fell apart, so maybe part of it jammed behind the R12 valve and it blocking some movement? When I zoom on the r12 valve picture, I don't see anything. Can I remove the r12 valve to check? The system is empty.
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Old 07-23-2020, 06:16 PM   #8
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If it's empty, no problem. Removes just like any valve stem. I'd put some tape over the open hole to keep moisture out.
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