Last post on Jun 11, 2010 at 2:18 PM
You are in the Pontiac Bonneville
What is this discussion about?
Pontiac Bonneville, Sedan
#4 of 12 Re: bonneville vacuum tube [santonio03]
Jun 09, 2010 (4:23 pm)
There are 4 of them...
ORN orange is recirculate door
WHT white is the bilevel valve for AC and floor. White vacuum only gives floor I believe.
GRN is the other end of the bilevel and when it's on with the white the valve is held midway and the air goes to AC/defrost direction AND to the floor for bilevel.
BLU blue is the valve for defrost that closes to force air out dash ducts.
#5 of 12 Re: bonneville vacuum tube [imidazol97]
Jun 09, 2010 (6:39 pm)
meaning the orange tube is for the vents?
#6 of 12 Re: bonneville vacuum tube [santonio03]
Jun 10, 2010 (6:43 am)
The orange goes to the recirculation vacuum motor over above the driver's pedals. It lets the air from inside the car be mixed with some outside air and blown back through the system. I think that is probably the door you could see with the blower motor removed on the firewall.
The dash vents are the defrost door. It closes the duct going on up to the defrosters and makes the air come out the dash vents instead. At the same time the bilevel vacuum diaphragm is closed so no air goes out the floor vents; that means the air is all forced to go up toward the defrosters.
Do you have a problem? Is there a specific question or purpose you have? If I know your point, I may be able to help give you answers better.
#7 of 12 Re: bonneville vacuum tube [imidazol97]
Jun 10, 2010 (9:49 am)
Thanks for you help.. i have low air flowing through my vents.. when switch to floor or defrost i gets more air. i already clean my evap core. i think my door is not opening all the way.. are the doors control by accutators or vacuums? what is the exact color of the tube that control the defrost and vent.. i think i going to check for leaks or even replace the tube
#8 of 12 Re: bonneville vacuum tube [santonio03]
Jun 10, 2010 (11:01 am)
What kind of AC do you have? The digital readout with numbers for temperature settings? Or the stand type that just has a lever you move to adjust warm to cold?
#9 of 12 Re: bonneville vacuum tube [imidazol97]
Jun 10, 2010 (11:17 am)
MANUAL.. ALL MY SETTING WORK.(FROM VENT TO FLOOR TO DEFROST). EVERYONE I KNOW WHO HAS A 92-95 BONNEVILLE HAVE THIS PROBLEM AS WELL
#10 of 12 Re: bonneville vacuum tube [santonio03]
Jun 11, 2010 (6:58 am)
You have not stated what the problem is.
Saying everyone you know has the problem means nothing to me as to what your problem is.
#11 of 12 Re: bonneville vacuum tube [imidazol97]
Jun 11, 2010 (12:56 pm)
low air flow from vents
#12 of 12 Re: bonneville vacuum tube [santonio03]
Jun 11, 2010 (2:18 pm)
By "vents" I assume you mean the dash vents typically used for AC.
If flow normal when set to defrost and fan speed on highest?
Does the air out the "floor" setting give a good volume?
If so, I'd suspect, when in AC dash mode, some of the air is coming out the defrost along with the dash. 2nd would be that too much comes out the floor during AC because of the vacuum motor there not fully blocking off the flow.
Check the diaphragm with the blue tube going to it. Take off the driver's side hush panel under the dash to see the diaphragm that the blue tube goes to. With the blower motor running and control setting on AC, see if you can reach your finger behind the diaphgram and push the diaphragm toward the back of the can That's the way it should be sucked by the vacuum when "on."
If you can move it further, see if the dash vents are now giving better flow?
You can check to see if you're getting good vacuum to the programmer control box from outside by taking the violet hose off the black hose that comes in through the firewall on the passenger side. Let the running motor suck on your finger tip and see how strong it feels compared to the vacuum getting the blue tube at the diaphragm when the AC is called for.
You can do the bypass with aquarium tubing or 1/8 in internal diameter gasoline hose from auto parts store. Need about 1 - 1.5 inches length for each one.
Another test I did was take a hose off one of the other motors and apply it to the blue diaphragm and change the AC until it actuated and see if the diaphragm sucks in fully with a different hose. That would tell you your vacuum from the motor is okay and you don't have a rotted hose or cracked reservoir for the vacuum under the front fender.