Air not blowing through the main front vents. - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-09-2003, 02:11 PM   #11
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Quote:
Originally Posted by jwikoff99
I've had this happen. Pop the hood. On the fire wall there is a black tank. It is for the vacuum supply. If you are standing in front of the car looking at the engine, the black tank (about half a gallon or so) is to the left of the brake master cylinder. On the bottom of this tank, there should be two small vacuum lines connected to two posts coming from it. If there is a post open, there should be a vacuum line hanging somewhere very close. Hook it back up. I've knocked mine off changing the spark plugs, and I only got air at my feet and at the windshield. It also happened in my fiance'* 93 SE. I have auto climate and she has standard, and it is the same vac line that runs the flaps in the air system.
I am going to try this when i get home!

thanks
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Old 06-09-2003, 10:09 PM   #12
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Quote:
Originally Posted by jwikoff99
I've had this happen. Pop the hood. On the fire wall there is a black tank. It is for the vacuum supply. If you are standing in front of the car looking at the engine, the black tank (about half a gallon or so) is to the left of the brake master cylinder. On the bottom of this tank, there should be two small vacuum lines connected to two posts coming from it. If there is a post open, there should be a vacuum line hanging somewhere very close. Hook it back up. I've knocked mine off changing the spark plugs, and I only got air at my feet and at the windshield. It also happened in my fiance'* 93 SE. I have auto climate and she has standard, and it is the same vac line that runs the flaps in the air system.
Guess what ..this fixed it..thanks a lot for all of your help!
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Old 06-10-2003, 04:45 AM   #13
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I will accept your thanks in blatent compliments and weekly cash payments....

Glad I could help.
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Old 07-11-2003, 07:54 AM   #14
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:( I'm having the same problem on my 94 SSE with the electronic temperature control. The AC only blows out of the footwells, defrost area, and rear seat vent -- regardless of what the display shows.

I tried jwikoff99'* suggestion, but I think I need more direction. When I pop the hood and look underneath, (standing a the front of the car) I see the brake resivior on the driver'* side near the firewall. Just to the left of that is a large, black circular "thing" about ~10" in diameter attached to the firewall. Is that the vacuum supply? I didn't see any loose tubes. Is this something I'm going to have to jack up the car first and get underneath?

I also tried willwren'* suggestion. I removed the bottom panel on the passenger'* side but saw nothing that looked like a "hockey-puck type device with several wires going in and out".

TIA
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Old 07-11-2003, 11:23 AM   #15
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Quote:
Originally Posted by ricks99
:( I'm having the same problem on my 94 SSE with the electronic temperature control. The AC only blows out of the footwells, defrost area, and rear seat vent -- regardless of what the display shows.
Okay, the problem sounds like there is no vacuum in the system to operate the duct servo motors with. Go on...

Quote:
I tried jwikoff99'* suggestion, but I think I need more direction. When I pop the hood and look underneath, (standing a the front of the car) I see the brake resivior on the driver'* side near the firewall. Just to the left of that is a large, black circular "thing" about ~10" in diameter attached to the firewall. Is that the vacuum supply?
I think you've found it, yes. You should find two vacuum lines connected to it: one in, one out.

Quote:
I didn't see any loose tubes. Is this something I'm going to have to jack up the car first and get underneath?
I don't think there'* anything to see from below, no. I would disconnect both vacuum lines at the reservoir (keep track of which goes where) and just verify that with the engine idling, you've got a vacuum draw there on one line, and when you reconnect that line, you then get a vacuum draw on the port where the other one plugs in. Assuming you do, then there'* apparently a leak somewhere in the dash. If you don't, then you've got a disconnected or broken vacuum line somewhere under the hood.
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Old 07-11-2003, 02:54 PM   #16
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The reservior shouldn't be round. The round thing is part of the brakes. What your looking for should be squareish. There is a large black plastic piece that says Relay Center. The reservior should be in between it and the round thing. The top of it should come even with the top the the large plastic piece. On the bottom, pointing forward, should be two vacuum lines less than 1/4" diameter attached to it.
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Old 07-11-2003, 03:15 PM   #17
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Quote:
Originally Posted by jwikoff99
The reservior shouldn't be round. The round thing is part of the brakes.
D'oh! Yeah, I hadn't thought of confusing the reservoir with the vacuum booster for the brakes...

Hey, could someone who'* got an engine photo handy just PhotoShop an arrow onto it that points to the vacuum reservoir, and post it here?
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Old 07-14-2003, 07:35 AM   #18
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Yes, a picture would be _very_ helpful....
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Old 07-14-2003, 01:16 PM   #19
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Thanks jwikoff99 for the description. I found it. Both tubes are attached. Anything else (easy) to check?
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Old 07-16-2003, 08:31 PM   #20
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Quote:
Originally Posted by jwikoff99
The reservior shouldn't be round. The round thing is part of the brakes.
Okay, my bad. In the course of getting the evaporator out of my '93 today, I had to remove the reservoir, and on the Bonneville it is in fact not the old-style round, spherical thing that the older models all used; it'* a big cube-shaped thing sitting on the firewall right next to the master cylinder vacuum booster. Sorry if I confused anybody before...
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