Part question
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Laughing Gas
Joined: Nov 2014
Posts: 1,108
Likes: 23
Part question
What do you call the valve cores that are in the low and high side pressure ports on the AC. Sniffer went crazy over the high side port. I took off the cap and it went off. I left it off a few minutes, it still picked up a little. I put my finger over the port about 10 seconds and then tested it and it went off big time. There was a little bit of a reading on the low pressure side...very very small but there. Anyway, I definitely need to replace those valves--I think they are Schrader valves but I'm not sure. I know finding a Ford part # will be a blast
5th Wheeling
Joined: Apr 2005
Posts: 48
Likes: 2
From: West Chester,PA
I just talked to a co-worker that worked at a dealership, he said they make a tool to change the valve, without losing hardly any of the charge. You can take it to a shop, or buy the tool.
Mastercool (MSC81490)
R-134a Valve Core Remover/Installer
Mastercool (MSC81490)
R-134a Valve Core Remover/Installer
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Laughing Gas
Joined: Nov 2014
Posts: 1,108
Likes: 23
Thanks-this all helps a lot. If you have had the original charge in the system,in my case, 13 years, would it be wise to go ahead and evacuate the system? I have a pump for it. Also should I replace the orifice tube and expansion valve, I understand they get crud in them... as long as it doesn't get overly complicated.
Hotshot
Joined: Jan 2004
Posts: 19,768
Likes: 1,082
From: St Louis
Try tightening the core first before assuming it needs replacement. I've seen ones that were loose and all it took was a bit of snugging up to correct the leak. Also, be sure to use the exterior caps and that they can seal properly. The caps not only keep the service ports clean, they can help to slow down any leakage by acting as a secondary seal.
The tip about the MasterCool tool is a good one, it isn't mandatory any longer to evacuate the system to replace the valve cores. However, starting from a completely empty system that's been vacuumed does allow for an accurate charge provided proper procedures are followed.
The tip about the MasterCool tool is a good one, it isn't mandatory any longer to evacuate the system to replace the valve cores. However, starting from a completely empty system that's been vacuumed does allow for an accurate charge provided proper procedures are followed.
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