Going to retrofit a 1986 regal to 134a. It has dual electric fans as pullers and a parallel flow condenser. I have been told to use a red orifice tube (.062'') instead of the white (.072'')to help with the idle temperatures. These cars never had good idle temps but once they are moving they cool great. This car especially needs all the help it can get at idle since it is a t-top. After a lot of reading about changing orifice tubes it seems many people are confused about the effects and changes to the system pressure and flow. If someone could please take the time to explain what happens to the system when smaller tube is used it will benefit many future readers. Why is there a .072'' all the way down to a .047''? Doesn't a Ford Econoline use a (orange) .057''. That is a large cabin to cool and it uses a small orifice tube so why can't I do the same? Why did GM use such a large tube while Ford and Chrysler went smaller?
Edited: Mon July 01, 2013 at 5:01 PM by Turbo
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