[Supras] A/C sealer

[berniek at technicaldevelop.com]

PS:  I had not realized until reading your next posting that you had 
converted over to R134a or had it initially in your Cherokee.  
Polyalkaline glycol (PAG) oils are customarily used with R134a, and are 
synthetic.  But you must get every last drop of mineral oil out of the 
system, use compatible O-rings, and in some cases change hoses (some 
hoses are permeable to R134a due to smaller molecular size).  
Commercially available flushing solutions are available for mineral oil 
removal.  If you cut open a filter dryer you will always find remnants 
of manufacturing chips, just as if you open and examine the first engine 
oil filter pleats after a rebuild.


BernieK


berniek at technicaldevelop.com wrote:
> Chad:
>
>
>    I'll look back in the archives (not tonight) and see where the 
> professionally acceptable stuff came from.  Professional shops may not 
> admit that they are using it, but one of the forums that I was a 
> member of maybe 10 years ago indicated otherwise.
>
>    The aluminum chips on the outside of the filter dryer media 
> appeared to come from compressor or fitting machining at the time of 
> manufacture and stood no chance of getting through the filter media.  
> The filter dryer media is constructed such that chips cannot get 
> through to the inner space where the dessicant bag is and where the 
> outlet to the expansion valve is.
>
>    R12 systems do not require a synthetic oil although a synthetic 
> version of mineral oil can be used.  The refrigerant must be soluble 
> in the oil which is the case when mineral oil is used with R12.  PAG 
> oil (there is one other alternative) must be used with R134a.  Mineral 
> oil is a higher viscosity counterpart of baby oil.
>
>
>    Bernie
>