I have another thread in the V8 section about the a/c causing an Idle vib. in my 2007 F-15o 5.4. To make a long story here short I am Installing a new compressor, clutch, dryer, and orifice. My old orifice had some metal chips on it and I need to flush the system. I don't know if its right but the last time I did this to my 93 F-150 @ 5yrs ago I just poured the stuff in the lines, condensor, and evap and blew it out with an air hose before the stuff evaporated. That a/c system has worked fine since. Anyway, what is the best Method to do this? Any input would be h.elpful

 

The orifice tube should have caught any fragments from the compressor. So, you are removing the compressor and the orifice tube. I would just blow out that line between the compressor and the orifice tube and it should be okay. I've replaced compressors and dryers and orifice tubes before but I'm no expert so take this as free advice worth what you paid for it.

 

Ford usually only recommends flushing when you have a chemical reaction in the system. We call it black death. Mainly because the oil as turned solid black on the inside because of the break down of the oil and R134a. If that is not the case, I would not flush it. Ford does have a flushing machine that cost $4k that only dealers can afford and even they do not use it unless it is really needed.

 

Actually if you want to flush it napa has fluid that you can buy that you pour into the system and flush it out.

What you want to do is disconnect every line that you can get to, dump a little bit of the flush in and blow it all out with an air hose. You want to do this backwards though the condensor and evaporator. This will get all the nasty stuff out. 90% of the time when I do A/C jobs I dont need to flush the system. However sometimes the compressor gernades and sends its guts through the system which could easily get into a new compressor or clog up a new orfice tube