a/c flush
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Logistics Pro
Joined: Feb 2000
Posts: 3,955
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From: Mesa
a/c flush
I need to flush the a/c system. The condensor and evaporator. How does everyone do it? Autozone has a kit you can rent for $40 but I think you have to buy the flush stuff. Is there a way a shade tree mechanic can do this at home?
Fleet Mechanic
Joined: Feb 2006
Posts: 1,776
Likes: 5
From: Lorain County, Ohio
You need a fully evaporating solvent that won't leave a residue to flush AC parts. You also need access to LOTS of compressed air, something along the lines of 15cfm or more. (5hp, 2 stage, 60-80 gallon compressor) The system needs to be DRY when you're finished.
The solvents that I've seen at the parts stores lately are citrus based and leave lots of residue. I can't say that they don't work, but I don't trust the residue they leave behind. It's made to break down the old oil so the residue would also break down the new oil.
I use a product called Dura-II which is specifically made for AC systems. I've also used laquer thinner or isopropyl alcohol as needs dictated.
As far as flushing the condenser;
-If you are just flushing to remove the old oil, you should be fine.
-If you have had a compressor failure, REPLACE the condenser. It cannot be reliably flushed even with professional equipment.
Hope this helps.
The solvents that I've seen at the parts stores lately are citrus based and leave lots of residue. I can't say that they don't work, but I don't trust the residue they leave behind. It's made to break down the old oil so the residue would also break down the new oil.
I use a product called Dura-II which is specifically made for AC systems. I've also used laquer thinner or isopropyl alcohol as needs dictated.
As far as flushing the condenser;
-If you are just flushing to remove the old oil, you should be fine.
-If you have had a compressor failure, REPLACE the condenser. It cannot be reliably flushed even with professional equipment.
Hope this helps.
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