[DeTomaso] Air Conditioning Question- Specifically Regarding Replacement of the Expansion Valve... Or Not...

[Peter Kovacs]

I don't think is the relationship between politicians and car design, I think its the relationship between politicians and the companies with a patent that is about to expire.
 
Peter Kovacs
Property Equity & Mortgage Mgmt
209 345-6708 
209 523-4919 fx



----- Original Message ----
From: "JDeRyke at aol.com" <JDeRyke at aol.com>
To: cdifani at pacbell.net; detomaso at realbig.com
Sent: Saturday, September 13, 2008 12:48:58 PM
Subject: Re: [DeTomaso] Air Conditioning Question- Specifically Regarding Replacement of the Expansion Valve... Or Not...

FWIW, R-12 and R-134a are reputed to use a different expansion valve. The 
valves themselves are extremely rugged, being all-brass. Under an allen nut on 
the input side is a small shuttle with a spring, so perhaps the spring strength 
is what changes for more (or less) pressure with the two freons. 
If the shuttle is free to move and the metal diaphragm is not perforated, the 
valve is OK. One other thing- my R-134a valve had no screen filter above the 
nut and shuttle- someone told me this was to promote higher freon flow. I 
added the cleaned up screen from my R-12 valve to the new one anyway, because a 
filter seems important in the lines somewhere!

Finally, word is, U.S suppliers may be changing  air conditioning fluid 
AGAIN from R-134a to "something else". Damn, I wish the politicians would get out 
of car design.... My 2¢- J DeRyke


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