Your AC is a sealed system. Desert dust doesn't get in it. Similar to your Power Steering.... a sealed system.

Flushing is to TRY to remove contaminates from your failing system. Mainly pieces of the compressor that have grenaded into the rest of the system.
Since you are replacing the condenser (kuddos, good choice) and the discharge hose, that doesn't leave much to be flushed.

You've got almost the entire system.... have you thought about replacing the evaporator?
It does basically the same job as the condenser. Both will get coated internally and loose efficiency.
Since your so close to a compete renewal it would be pretty easy to spend a couple more bucks and have a new system. Evaporators dont commonly get serviced because they are typically very labor intensive, but I think It's not too hard on a SD.


EDIT: oh yeah.... they sell AC flush, not sure if it's anything other than denatured alcohol as Jason suggests. It does smell pretty bad so maybe it's something else. We have an apparatus to pressurize it into the component being flushed, then let it sit for a period of time, then blast it out with pressurized air for a while.

 

i know an ac system is a closed system. I said the stuff about the dust and sand because the compressor was removed from the v10 that used to be in the truck and now the 7.3 sits in its place the lines that go to the compressor were cut off and laying there with the system open in this dusty environment

 

Will replacing the evaporator really be a big change ?

 

It will make the evaporator colder. I’ve been all over the country from Key West to Seattle and SoCal to Boston and never had a problem.

I have seen the evaporator freeze on trucks with this mod, but they were hi idling with MAX AC and running low fan. Doesn’t hurt AC components, just no airflow past iced up evaporator. Easy to avoid. Outside air (not MAX) for low fan if sitting still.

 

And would the expansion valve be ok ?

 

No Expansion valve on our trucks, thats what the orifice tube is for.

 

no way to tell without somehow determining the condition of yours. Aside from being plugged up externally, the passages internally have oil and whatever other contaminates made it through your orifice tube. If you can clean it externally (theres a writeup on here about doing that) and if your orifice tube comes out clean there is probably very little benefit.

 

I have rear air in my x it’s gold block with a couple of lines going to it

 

I’ll have to pull it and take a look then

 

Check the Tech Folder, there is a video and write-up.

 

forgot you had an excursion.... The expansion valve should be replaced, just like the orifice tube.

 

Well I’ll be getting one of those too lol I saw somewhere that to use nitrogen to clean the ac flush out ?any one heard of that or if that is a thing ?

 

where is the tech folder ?

 

It's suggested to use nitrogen because it is inert and doesn't introduce moisture into the system.
Your system has been open to atmosphere and moisture is in it. Nitrogen isn't fixing anything.
I have, and use nitrogen for pressure testing systems. It is accepted and common practice.

I always vacuum systems for 45+ minutes and believe this removes all moisture from systems, if there are no leaks.

In My Opinion, if you adequately vacuum your AC, there will not be moisture remaining from Oxygen/Atmosphere.

In My Opinion, Nitrogen is unnecessary.

I am an inexperienced and mostly uneducated goofball from Alaska that only recently started working on AC.

Do Not take my opinions as facts. Google that **** and form your own ideas.

Having said that, In the summer I now do several AC services and/or diagnosis every day.

 

Oh wow.

You have a lot of reading in your future.

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