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Expansion Valve & tape

rljt60 on Mon September 10, 2007 2:41 PM User is offline

Year: 1930
Make: Ford
Model: A
Engine Size: 351ci
Refrigerant Type: R-134
Ambient Temp: 80
Pressure Low: 45
Pressure High: 280
Country of Origin: United States

Just replaced all the R12 hoses and clamps, flushed components, replaced dryer and reoiled compressor on a friends '30 Ford hot rod. Vaccumed it hours and then charged. We did have to replace the expansion valve as the other broke coming off. The valve coil is held against the evaporator pipe with a spring clamp. The problem is that now it only drops 20 degrees off 80 degrees ambient where before with a full charge of R134 it dropped no less than 25 degrees. My question is "Does the expansion valve coil and pipe need to be covered with tape for it to operate properly?" Thanks

Dougflas on Mon September 10, 2007 3:35 PM User is offline

Yes. most definitely insulate it with the presolite tape. This tape is available at HVAC supply stores known as cork tape. Mount the sensing bulb at the 2 to 4 or 10 to 8 o'clock position on the evap tube.

TRB on Mon September 10, 2007 4:14 PM User is offlineView users profile

We also carry it in rolls or small packages.

Prestite Tape


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rljt60 on Thu September 13, 2007 8:42 AM User is offline

Thanks for the info. And FYI, it also helped when I reconnected the duct so the port didnt' blow directly on the expansion valve. Duhhh. Have a great day all.

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