under the dash board
2007-11-01 13:26:49 · 5 answers · asked by Wendy W 1 in Cars & Transportation ➔ Car Makes ➔ GMC
I own a shop, and what I would do is this. Plug all of them off with a golf tee, or a screw that will screw into them, and not leak too bad. Start the engine, and move the selector to different positions an take note of which hose gets vacuum at what position by removing the tee to check them upon each movement. Turn on the blower, and hook them up one at a time until you get the desired action from the vacuum chambers they attach to. Usually one can go by the length of the hose, and how it reaches the vacuum chambers they operate. A vacuum pump always comes in handy to tell which chamber works what. You can hear it move, and you will tell where the blower moves the air to when you put vacuum on them. This is a process of elimination, but if you don't have a routing schematic, or can't get one from a dealer, then this is the only way you can do it, and get it right.
Glad to help out, Good Luck!!!
2007-11-02 03:05:21 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Remove 1 hose at a time. Take 1 hose off, then replace it. Be sure to install the new hose to the same outlet as the one you took off. Then move on to the other hoses. Take 1 off at a time. Install the hose to the outlet you just taken off. Do this to all the hoses and you should be fine
2007-11-01 23:11:45 · answer #2 · answered by inflamedzero2002 2 · 0⤊ 1⤋
Trial and error which I don't like to do. I would go to the dealer and get a diagram of the underdash vacuum harness which is color coded to be sure.
2007-11-01 22:18:48 · answer #3 · answered by Deano 7 · 0⤊ 1⤋
operate the heater controls and make sure that the air comes out of the correct selected air distribution vents
2007-11-01 20:33:55 · answer #4 · answered by Anonymous · 0⤊ 1⤋
get a schematic from a dealer
2007-11-02 00:52:10 · answer #5 · answered by Hoot 3 · 0⤊ 1⤋