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Old 09-14-2019, 11:36 AM   #1
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Adding Refrigerant to Evans Tempcon Unit

On my 2003 National, the low side attachment is a 3 valve service valve. My question is, do you have to close (CW) the valve to add refrigerant? I'm having difficulty getting a reading or adding any refrigerant with the valve in the open (CCW) position. Not much room for my big fat hands to get in their. The RV has been sitting for over 2 years. A/C was good back then, but never great. Appreciate anyone's assistance!
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Old 09-14-2019, 01:33 PM   #2
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The set up you describe , doesn't ring any bells from the Evans units I've seen/worked on.
Any chance you could post a picture?
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Old 09-14-2019, 02:58 PM   #3
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I copied a link just like mine. It's right before the expansion valve. Hope this works?
http://www.irv2.com/attachments/phot...on_Valve_3.JPG
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Old 09-14-2019, 05:40 PM   #4
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Ok this is a set up I'm see for the first time .

But it's not before the expansion valve , it's after . The smaller line is from the compressor and after going through the expansion valve and evaporator in the dash the refrigerant needs the larger line to carry it.

EDIT: Back from the Evans/Tempcon web site and can't find the part in their listings . So Sorry I can't answer your question.
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Old 09-14-2019, 06:18 PM   #5
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Attach the hose , take the black cap off and turn the stem clockwise 3/4 of a turn . That should open so you can read the pressure, if thereís anything in it. Also before you attach the hose make sure thereís no shrader inside. If there is make sure the hose has a depressed in it. Havenít seen that setup before so not positive thatís the low side so proceed with caution.
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Old 09-14-2019, 06:54 PM   #6
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That is a low side port. Normally valve will be backseated (CCW) and now pressure at the cap. Attach hose and turn CW like tha last post says and you will have access to low side pressure. We us those type of valves in commercial refrigeration
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Old 09-15-2019, 06:27 AM   #7
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Appreciate everyone's response! I'm gonna give it a shot and will let you know the outcome. Thanks again!
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Old 09-16-2019, 12:28 AM   #8
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Make sure the engine coolant is not flowing through the heater core. If it does you will never get real cold air from the dash. Some of the heater control valves were installed backwards allowing coolant to flow through the heater core.
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Old 09-16-2019, 10:14 PM   #9
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My 03 Dolphin leaked from day 1. Had to be topped off every year according to the PO of my coach. There was paper work where the original owner had it back several times while under warrentee. I found the high side service valve leaking and replaced it back in 17. Thought I had it fixed as it held a vacuum for several hours before I charged it up. It was dead again when I put it up for sale a few weeks ago. Too much coach for me, went back to a 313 Challenger.
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