Automotive Air Conditioning Information Forum (Archives)

slcbird92 on Mon April 02, 2012 10:33 PM

Year: 1993
Make: Winnebago
Engine Size: 5.9
Refrigerant Type: R12 to 134a

Hello All,
I am in the process of performing a 134a conversion on the above mentioned rig. I want to thoroughly remove all traces of the r12 and mineral oil before installing my new compressor, dryer and expansion valve. I do not have a professional flusher so my questions are as follows.

1- Will mineral spirits adequately purge the contaminates and remaining oil from the condensor and evaporator?

2- What can I use to safely purge the roughly 60 ft of hose (yes it's all hose) without damaging the hose? I would be happy to use the HECAT supplied flush for everything if it wont damage the hose and the required amount is not too excessive. I only want to do this once so doing the job correct is my firs priority.
Thanks in advance,
Seth

HECAT on Tue April 03, 2012 1:53 PM

Yes, mineral spirits can be used for mineral oil removal only (not effective on PAG or POE). The HECAT Safe-Flush is better suited for all oils and will not damage any hoses or seals. However, without an effective delivery system, I am afraid the effectiveness of the solvent alone may not be enough. If you just pour in a blow the components, the fluid will drop to low points and the air will just pass over. In the case of the hoses, you may be successful at cleaning the lower side of the inner tube; but hey, that is where most of the oil will be anyway.

Have you considered replacing the hose with the nylon barrier type used with R134a?

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