# Variable valve orifice tube **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [June 1, 2009, 6:38pm UTC](https://community.cartalk.com/t/variable-valve-orifice-tube/31287 "2009-06-01T18:38:17Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Beadsandbeads](https://avatars.discourse-cdn.com/v4/letter/b/c57346/32.png) [@Beadsandbeads](https://community.cartalk.com/u/Beadsandbeads)\ **Post date:** [June 1, 2009, 6:38pm UTC](https://community.cartalk.com/t/variable-valve-orifice-tube/31287/1 "2009-06-01T18:38:17Z")
Does anyone here have any experience installing aftermarket variable orifice valves in place of fixed orifice tubes? They are supposed to increase efficiency of AC systems (cooler air and lower fuel consumption) and reduce compressor wear under certain conditions ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [June 1, 2009, 7:22pm UTC](https://community.cartalk.com/t/variable-valve-orifice-tube/31287/2 "2009-06-01T19:22:21Z")
Remove the refrigerant line to gain access to the orifice tube, and swap it out. Tester ---
**Author:** ![Beadsandbeads](https://avatars.discourse-cdn.com/v4/letter/b/c57346/32.png) [@Beadsandbeads](https://community.cartalk.com/u/Beadsandbeads)\ **Post date:** [June 1, 2009, 7:54pm UTC](https://community.cartalk.com/t/variable-valve-orifice-tube/31287/3 "2009-06-01T19:54:15Z")
Oops, sorry. I understand the installation. I was wondering if anyone knows if they help very much. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [June 1, 2009, 8:37pm UTC](https://community.cartalk.com/t/variable-valve-orifice-tube/31287/4 "2009-06-01T20:37:34Z")
I installed three of these VVOT’s in three GM vehicles. I saw no appreciable improvement in performance of the AC system. Tester