Automotive Air Conditioning Information Forum (Archives)

honestlou on Sun July 12, 2009 8:36 PM

Year: 1987
Make: Ford
Model: F250
Engine Size: 7.5L
Refrigerant Type: R-12
Country of Origin: United States

I am changing this one back to R-12 from R134. I purchased one of the HECAT flush systems to flush the R134 residue out of the system. I have read the directions that came with it and it appears that 1 gallon will flush for about 90 seconds. After that dry shop air is needed to get most of the residue to evaporate and remove all traces of the flush components. Just curious if I run a gallon of flush through the evap and condenser the residual ends up in the flush bucket as flush plus whatever is flushed from the system. Can the flush be reused or does it need to be disposed of at that point.

TRB on Sun July 12, 2009 8:56 PM

Yes you can reuse the flush a few times. Run it through a coffee filter between each use. I like to us half my flush for the debris and oil removal and the other half as the final flush.

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HECAT on Mon July 13, 2009 6:21 AM

That published flow rate is (worse case) with the smaller rubber tip. Use the larger tip when possible for increased flow. This pusle scrubbing process also uses a substantial volume of air; so the published liquid flow rate is a little deceiving as to the actual solvent velocity and energy action of this process.

Yes, the flush can be filtered and reused. Just flushing for conversion should not pose a problem and it would be fine to filter and reuse a few times as you see fit; and I agree with reserving a little fresh fluid for final flush as Tim recommended. However, if the flush is contaminated with dark burn oils or metallic debris, I would suggest considering the purchase of some more fresh flush.

Ultimately it is in your hands. Such decisions are very subjective to your analysis of your specific system issues. The two most important things to consider would be not to take short cuts to save a buck by not purchasing the proper amount or additional solvent needed to get the job done right; and secondly, not to recontaminate the system with the use of severely contaminated flush.



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FLUSHING TECHNICAL PAPER vs2.pdf 

Edited: Mon July 13, 2009 at 6:27 AM by HECAT

TRB on Mon July 13, 2009 10:30 AM

Quote
Originally posted by: HECAT
Ultimately it is in your hands. Such decisions are very subjective to your analysis of your specific system issues.

Agreed, one vehicle may need a half gallon of flush and the next 3 gallons. It all depends on the type of failure each vehicle has had.

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When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com