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First, a quick note of thanks to everyone - I've been able to fix every problem on my 87 5.0 TPI Firebird up to now with all the great info on this board....
OK, so I changed my A/C to R134a and finally got cold air for the first time in years... now I am fighting the problem of the air only coming out of the defrost vents.
Checking under the hood, I found 2 vacuum lines disconnected. One I was able to figure out where it went, the other I cannot.
The line is connected to something - I do not know what it is (see picture)... can anyone help? Thanks!
__________________ 78 Y88 Trans Am WS6 W72 TTops
87 Formula 5.0 TPI 5spd TTops
2000 Trans Am 6spd
I need some help too. on one of the last pictures, it shows on the back of the plenum, a small male fitting that is supposed to go to the HVAC. Can you provide me a picture of your HVAC vac line?
Check and see if the plastic ball underneath the driver side tray there, under the cruise control canister has the vacuum line attached... if not, that is the line for it.
Edit- that thing you put "what is this" is for your cruise control I believe, the plastic ball underneath is for vacuum.
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Its not perfect, but fun and practical. Everything's boxed in, polygraphite bushings, zerks fittings, ported L98 block, heads, intake, plenum. No smog, heat, or ac. No carpet, no interior except for the dash, shifter, and a seat. Shorty headers into a y pipe, to a 3" Powerstick that dumps out before the axle
2004 gm luxo blue paint from ppg/sand blasted rear end, new rotors calipers front/rear/dropzone springs
kyb shocks/strutscontrol arms/trackbar boxed in with 3/16" steel plate./Chassis front to back stitch welded/Brake Ducts/Ram air-cold air from foglight location/De-screened MAF/hvhp oil pump. - no oil starvation yet/Moroso blue race wires/hypertech cap, coil, and rotor, the 55k volt package?/bosch 4 tip iridium plugs/Mobil 1 15-50 Synthetic/ TH350, non lockup with transgo 350-3 full manual kit
I need some help too. on one of the last pictures, it shows on the back of the plenum, a small male fitting that is supposed to go to the HVAC. Can you provide me a picture of your HVAC vac line?
Check and see if the plastic ball underneath the driver side tray there, under the cruise control canister has the vacuum line attached... if not, that is the line for it.
Edit- that thing you put "what is this" is for your cruise control I believe, the plastic ball underneath is for vacuum.
OK,it makes sense that the "what is this" is the cruise control, as one of the connectors goes to the throttle. I do not see a plastic ball - when you say "driver side tray, under the cruise control canister" I do not know what you are referring to.... is the thing in the picture the canister? Keep in mind the Firebird vacuum canister is on the passenger side front, and the Camaro's is apparently on the driver side... thanks.
What about charcoal canister - on the camaro's there is a black canister about 5 inches in diameter on the driver side where the battery is at on pass side. There is a vacuum line runs to it I believe. The canister grabs fuel fumes every so often (ECM controlled) and holds them.
'fraid not... on the firebird, the charcoal cannister is on the passenger side front, and I have been able to check all the lines from it are connected properly. thanks
__________________ 78 Y88 Trans Am WS6 W72 TTops
87 Formula 5.0 TPI 5spd TTops
2000 Trans Am 6spd
update: I think that line is supposed to go the "orb of power", the vacuum reserve cannister. I found it under the battery tray (driver's side on the firebird), and it appears there is nothing connected to it. I am going to remove it and see if I can get it hooked up.
you got it, thats the one I was talking about underneath. Hope it all works for you! Reminds me I have to remove mine.
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Its not perfect, but fun and practical. Everything's boxed in, polygraphite bushings, zerks fittings, ported L98 block, heads, intake, plenum. No smog, heat, or ac. No carpet, no interior except for the dash, shifter, and a seat. Shorty headers into a y pipe, to a 3" Powerstick that dumps out before the axle
2004 gm luxo blue paint from ppg/sand blasted rear end, new rotors calipers front/rear/dropzone springs
kyb shocks/strutscontrol arms/trackbar boxed in with 3/16" steel plate./Chassis front to back stitch welded/Brake Ducts/Ram air-cold air from foglight location/De-screened MAF/hvhp oil pump. - no oil starvation yet/Moroso blue race wires/hypertech cap, coil, and rotor, the 55k volt package?/bosch 4 tip iridium plugs/Mobil 1 15-50 Synthetic/ TH350, non lockup with transgo 350-3 full manual kit
I was unable to get the "orb" out do to corrosion of the bolts holding it (sitting right under the battery).
So i just pulled the line to the orb and pushed it in the side. It seems to be in there pretty good, but the AC is still blowing only from the defrost vents. bummer.
I will pull the climate control unit this week and see if there is a leak there....
FirebirdFanatic , yup, thats the one Im reffering too. My HVAC unit doesnt work (no heating or AC). So with that said, can I just block it off or does it have to be connected? I asume that it goes into the firewall on the passengerside right? Or does "the bundle" mean the wiring harness? Thanks.
if you've got no heat or A/C coming out of any vents at all, then you don't have a vacuum issue. The vacuum line only controls which vent 'door' opens/closes to direct the air flow. When no vacuum is available to open/close these doors, the default is to blow out the defrost vents. If you have no air blowing anywhere, you may want to check into an electrical issue with your blower motor.
