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How is my A/C repair plan?

BonesDT on Wed June 18, 2008 3:37 PM User is offline

Year: 1999
Make: Ford
Model: Explorer
Engine Size: 4.0L
Refrigerant Type: R-134a
Ambient Temp: ?
Pressure Low: ?
Pressure High: ?
Country of Origin: United States

I have a '99 Ford Explorer. My fan belt broke and took a hole in the A/C hose with it. I've been driving around with the hole for ~2.5 years now. What do you guys think of my plan:

1) I have a brand new hose. I'm going to replace the accumulator/drier and orifice filter. I'm going to replace all o-rings I disturb and lube with Nylog Blue.

2) Should I flush anything? Evaporator or condensor? How do I know if my compressor is flushable. I was going to manually "flush" it with the refrigerant oil. I'd like to avoid paying for flush equipment.

3) With the hoses disconnected, I think I can easily access the evaporator. Should I bother cleaning it with odor stuff. I didn't have a problem before. I was thinking about inspecting it and maybe cleaning the exterior with a brush and some household stuff.

4) I need to replace with oil. The factory manual say use 9oz of PAG. When I called AMA, they told me to use 7oz of PAG-46. What's the difference between PAG oils? How should I deal with measuring out the oil. I was thinking about filling the new accumulator with ~2oz and carefully measuring the oil I put in and extract from the compressor, and adding ~4-5oz in the end. Is there a significant amount of oil in the other hoses, evaporator or compressor?

5) After assembly of everything, I will extract and charge.

99 Ford Explorer

89 Dodge Dakota

bearing01 on Wed June 18, 2008 3:57 PM User is offline

You'll want to remove the compressor and drain all the old oil out of it. That where most of the oil lives that you need to replace. I think there's a link in the FAQ on how to do that.

To add a measured amount of oil I use those large medical syringes. I get them at Marshall's Industrial Supplies. I guess you can get them wherever, maybe even a drug store. The scale is cc's (mL) so just convert fluid Oz to cc by multiplying oz by 29.58 (ie 9oz = 266.25cc)

try to blow (compressed air) out any old oil or debris from the condenser and evaporator.

Usually there's a specification for the volume of oil for the compressor alone (as if you were to replace only the compressor) assuming that there is oil distributed around the system. That's why sometimes there's a system oil volume number and sometimes a slightly lower number for the compressor alone.

PAG oil comes in different viscosities. Different compressor types (ie vane versus reciprocating) typically require different oil viscosities.

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