Topic: Vacuum reservoir?

[jfrabat]

OK, I need your opinion; I have noticed that when driving against the wind, when I need to increase the throttle position to go up against a slight incline (or when the wid gives the 4 angry squirrels a hard time maintining speed), that the vacuum motor of the ventilation system has a very hard time keeping the outside air out...

My questions are:
1. Is this something I should be concerned about, or is it normal?
2. If it is normal (I think it is) for vacuum pressure to drop at full throttle with a havy load placed on the engine, I was thinking of using a small vacuum reservoir to help the HVAC system (particularly the vent part).  Would this be a good idea? 
3. If (3) is a good idea, which vacuum reservoir would you recommend?  I have heard that some people have used fuel filters as vacuum reservoirs...  At some point I thought my brake booster was not getting enough vacuum (I thought that was the cause of my braking issues, but it was not) so I installed a vacuum reservoir for it, but I prefer not to connect any other vacuum accessories to my brakes; also, that reservoir is a little big for what I need, so I guess I'll just leave it where it is...

Anyway, I know I dont have any vacuum leaks because I changed most of the lines and check the vacuum level and it was fine; also, the Jeep is idling fine, and this only happens when the throttle is wide open (or close to it); if I let go of the throttle even some, the vent door starts working properly...  By the way, I wish Jeep had just used a cable actuator for many of the vacuum controled ones they did (like the axle disconnect and the doors of the vent system!).

Felipe

[jrollings]

i have this exact problem. does it slap shut or open everynow and then? is your lever sometimes hard to put from vent to heat or to off? mine is. i thought maybe i could put a stronger spring on the side of it that controls the opening and closing but i wasnt sure. if you end up solving this problem shoot it my way if you dont mind. ............hopefully im on the right track of what yours is doing as well.

[jfrabat]

i have this exact problem. does it slap shut or open everynow and then? is your lever sometimes hard to put from vent to heat or to off? mine is. i thought maybe i could put a stronger spring on the side of it that controls the opening and closing but i wasnt sure. if you end up solving this problem shoot it my way if you dont mind. ............hopefully im on the right track of what yours is doing as well.

Mine is not hard to move over (well, it is not "soft", but it is about what I would expect!), but it does come open and I can feel the air coming from the defroster vents when the engine has an open throttle and under load at speed...  I am thinking the vacuum reservoir would solve that, but I want to keep it as small as possible.  I think I'll give it a shot, and will keep you posted.

[aw12345]

I am pretty sure it should have a vacuum check valve. once its in posiyion it traps vacuum unless there is a small leak in a hose. the control unit or the vacuum motor then it needs a constant vacuum supply, even with a vacuum reservoir it needs a check valve and a check for vacuum leaks in the heater control system

[jfrabat]

I am pretty sure it should have a vacuum check valve. once its in posiyion it traps vacuum unless there is a small leak in a hose. the control unit or the vacuum motor then it needs a constant vacuum supply, even with a vacuum reservoir it needs a check valve and a check for vacuum leaks in the heater control system

The vacuum reservoirs ussually (although not necesarilly) come with an integrated check valve...  I am planning to get one of these.  Actually, I would probably use 2 seperate ones; one for the cruise control (I installed an aftermarket one, and it is vacuum operated, so it probably is having a negative effect on the overall vacuum) and one for the HVAC.

Felipe