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Old 04-07-2020, 03:10 PM   #1
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R134 Port on 1994 Ford F53

When I remove the blue cap on my R134 port, the system releases pressure. It doesn't leak when the cap is in place. I've never seen that before on another vehicle. The smell of the escaping gas didn't smelled more like stale air that freon. I didn't leave the cap off long enough to really inspect anything. Is the port defective? Is this normal? I wanted to check pressure on the system, but this can't be right.
Thanks!

Sean
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Old 04-07-2020, 03:54 PM   #2
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There is a Schrader valve in the fitting. Like a tire valve core.

It must be stuck open.
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Old 04-07-2020, 07:27 PM   #3
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Quote:
Originally Posted by semcha View Post
When I remove the blue cap on my R134 port, the system releases pressure.
What twinboat said and...Are you certain you have R134A refrigerant? R134A was mandated starting 1995. You say your chassis is 1994, and frequently they are one year earlier than the coach manufacture date.

If the A/C system is an Evans TempCom, This link may be of interest to you.
There is a PDF copy of the A/C systems built for the F53 chassis that contains much info, in one place, that is not always easily available. Currently, the site may be unavailable because of " the Virus situation", but this is where I downloaded it from. Too large to transfer here.

http://www.evanstempcon.com/

Phil
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Old 04-08-2020, 12:03 AM   #4
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134A has different connections then R12 did. If you have standard 1/4" flare fittings you have R12. If your connections larger and look like a quick connect fitting you have 134A. As for the Schrader valve leaking when you take the cap off I wouldn't worry about. It will get changed if you ever have the system service.
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Old 04-09-2020, 02:28 AM   #5
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r-134a refrigerant

It is r-134a. It is printed on the refrigerant line and on a port on the system. Thanks for the replies!
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Old 04-09-2020, 06:56 AM   #6
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if your system is still cooling, you could try removing cap and quickly depress the needle of the valve it may reseal. if it doesn't cool make sure to replace core before recharging
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Old 04-09-2020, 06:59 AM   #7
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If you are concerned, virtually all HVAC techs have a tool that allows them to replace the Schrader valve while the system remains fully charged.
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