orifice tube

[71monteme]

hey guys and gals.
i read some where here to get colder a/c, i could use an orifice tube from a lincoln, i've done the search on the forum and read about 100 posts and could not find the answer.
can some one point me in the right deriction?
thanks

[clinebarger]

Chevy uses a Black/White .072" orifice tube.
Ford/Lincoln has used 3 different size orifice tubes over the years.
Blue .067"
Red .062"
Orange .057"

Try the Blue .067" first, Running to small of a orifice can cause high head pressure.
This is used as a band-aid fix for wore out compressors, to much oil, not enough freon.
A GM system thats in good shape & has the proper amount of freon & oil will cool great with the factory .072" orifice.
What year truck are you working on?

[71monteme]

it is a 97 suburban. a/c works good now but i want it to get down to about 30 degrees. i read that with the lincoln tube i can get it down to 20degrees.
thanks.

thanh

[garcia77]

70BLAZERX2 posted that a '89 crown victoria would do exactly what you are asking. I dont know how to navigate around here to well but if you look up my old post, there is one in there about A/C issues. might help. I personally havent tried it. Im replacing my hoses this weekend so I might just go for it

[71monteme]

Originally Posted by garcia77

70BLAZERX2 posted that a '89 crown victoria would do exactly what you are asking. I dont know how to navigate around here to well but if you look up my old post, there is one in there about A/C issues. might help. I personally havent tried it. Im replacing my hoses this weekend so I might just go for it

thanks for the info. and if you do change the tube let me know how well it works.
thanks again.

thanh

[clinebarger]

Originally Posted by 71monteme

it is a 97 suburban. a/c works good now but i want it to get down to about 30 degrees. i read that with the lincoln tube i can get it down to 20degrees.
thanks.

thanh

The evaporator will freeze over in high humidity at those temps & the low pressure switch will cycle the compressor clutch in & out.
Are you sure its not low on freon? 96-00 vortec compressors are notorious for leaking!!!

[71monteme]

Originally Posted by clinebarger

The evaporator will freeze over in high humidity at those temps & the low pressure switch will cycle the compressor clutch in & out.
Are you sure its not low on freon? 96-00 vortec compressors are notorious for leaking!!!

thanks for that info. also the a/c is working good, i just wanted colder.

[iluvmy72]

you will not get to 20!!!!! You'll end up cracking your core