AC install / rebuild
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Senior User
Joined: Nov 2005
Posts: 295
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From: Collierville
AC install / rebuild
I got my complete AC for a mid 70s truck in today and everthing looks prety good. I have a few questions though.
1) I should replace the dryer?
2) The compressor is a York and I don't know how long it has been off or how much oil is in it. Should I drain out the oil and replace it with the correct volume? What is that volume and what type?
3) The spounge like insulation on the flapper door in the box is failing so what should I replace it with?
4) The black gook (Insulation?) on the expansion valve is somewhat missing so what should I replace it with and where can I get it?
I am sure I will think of something else shortly but this is a start - Thanks.
1) I should replace the dryer?
2) The compressor is a York and I don't know how long it has been off or how much oil is in it. Should I drain out the oil and replace it with the correct volume? What is that volume and what type?
3) The spounge like insulation on the flapper door in the box is failing so what should I replace it with?
4) The black gook (Insulation?) on the expansion valve is somewhat missing so what should I replace it with and where can I get it?
I am sure I will think of something else shortly but this is a start - Thanks.
Fleet Mechanic
Joined: Feb 2006
Posts: 1,776
Likes: 5
From: Lorain County, Ohio
1. YES!! Always.
2. YES!! but I don't know how much. Mineral oil with R-12, Ester with R-134A. If the compressor has sat for any length of time, replace the shaft seal or have it done. There is a procedure for fashoning a dipstick to check the oil level but if you don't have an original Ford manual.... Check with www.ackits.com, they have a general AC manual that should have that information. The York compressor had a sump that held xx amount of oil and there was also yy amount circulating through the system, for a total of xx+yy=zz, IIRC, zz was around 14 ounces. The amount is pretty critical. If you can find the AC tag from your doner truck, the info will be there.
3. Be creative. Foam door stripping from Home Depot can work. Trim to fit and use weatherstrip adhesive to attach it.
4. The goo is called mastic (mastick?). Check with a local NAPA or CarQuest store that makes AC lines. 3M Strip Caulk can be used in a pinch. The sensing bulb from the expansion valve is buried in that goo. Make sure it is held firmly against the evaporator tube. Replace the expansion valve while you're rebuilding the system.
The POA valve (long expensive looking valve on the evaporator outlet) is a crapshoot. They are often ok, but remember, it's 20+ years old and may have been exposed to the atmosphere for how many years? You may want to consider buying a replacement, especially if you are going with R134a. The replacements can be calibrated for the newer refrigerant.
2. YES!! but I don't know how much. Mineral oil with R-12, Ester with R-134A. If the compressor has sat for any length of time, replace the shaft seal or have it done. There is a procedure for fashoning a dipstick to check the oil level but if you don't have an original Ford manual.... Check with www.ackits.com, they have a general AC manual that should have that information. The York compressor had a sump that held xx amount of oil and there was also yy amount circulating through the system, for a total of xx+yy=zz, IIRC, zz was around 14 ounces. The amount is pretty critical. If you can find the AC tag from your doner truck, the info will be there.
3. Be creative. Foam door stripping from Home Depot can work. Trim to fit and use weatherstrip adhesive to attach it.
4. The goo is called mastic (mastick?). Check with a local NAPA or CarQuest store that makes AC lines. 3M Strip Caulk can be used in a pinch. The sensing bulb from the expansion valve is buried in that goo. Make sure it is held firmly against the evaporator tube. Replace the expansion valve while you're rebuilding the system.
The POA valve (long expensive looking valve on the evaporator outlet) is a crapshoot. They are often ok, but remember, it's 20+ years old and may have been exposed to the atmosphere for how many years? You may want to consider buying a replacement, especially if you are going with R134a. The replacements can be calibrated for the newer refrigerant.
