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Flushing fluid to use to flush evaporator?

jagrov on Wed October 22, 2008 9:15 AM User is offline

Year: 1971
Make: Jaguar
Model: XJ6
Engine Size: 307 chev
Country of Origin: Australia

Hi all,

I am looking for a suitable product to use to flush out my second hand factory fitted evap unit for my series one Jaguar XJ6. Evap unit is out of car & a month or so ago a kindly refrig tech gave me some CPS Pro flush fluid fo flush all the old R12 oil out. I used compressed air to blow the solvent out and popped the evap dry, thought all was ok, but now still have traces of oil at the inlet. I have not got any flush flluid left, and the ones on the Australian market ERG UFA, CPS are about $250 for a minimum amount of 5 litres! (ouch!) any suggestions on a less expensive alternative? I want to make sure this evap is totally clean before I start reassembly.



HECAT on Wed October 22, 2008 10:24 AM User is offline

Not sure of the chemical composition of the CPS flush (found nothing in a quick search), but I would guess it may be an ester oil based product that will not blow dry, and will leave some of the ester base behind. Also, it may not be compatible with the mineral oil; as it is probably designed more for the synthetic PAG and POE oils that are common today; this would also explain why some oil remains.

Effective flushing in the car requires some aggressive energy to penetrate all the corners, crevices, and parallel paths; and "pour in - blow out" will not work. However, in this case with the unit removed, you may be able to do this without any special equipment.

I would use a good quality Mineral Spirits (petroleum distillate) product such as Exxon Varsol or an equivalent for its ability to remove the mineral oil, and has an evaporative nature that will allow for it to be blown dry.

Fill the component about 3/4 full of liquid, seal of the ports with your fingers, and shake it good for a few minutes to allow the chemical to penetrate all the corners and traps. Pour out as much as you can and then blow dry. Use only dry (filtered) air and allow as much volume as possible to blow for at least 20 minutes. While the air purge is being done, turn it over and or move the component into a few different positions to aid in removal. Follow with the "pop" test to be sure its done to your liking.

Hope this helps.


HECAT: You support the Forum when you consider for your a/c parts.


jagrov on Wed October 22, 2008 3:45 PM User is offline

Thanks Hecat,

your information has been of great help.



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