Info about HVAC controls
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Joined: Oct 2014
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From: Italy
Car: 1989 Gray ttop GTA
Engine: 5700cc
Transmission: auto 700R4
Info about HVAC controls
Hi guys 
I have a list of thing I don't know precisely how to use on my GTA
This is a fast question, if someone would be so gentle to help me. I don't know the meaning if those controls:
1- what is the diff between air cond "Max" and "Norm"?
2- what is air cond "bi-lev"?
3- how does the two Economy modes work?
plus:
4- does the T/A has foot air?
THANKS GUYS
bye
I have a list of thing I don't know precisely how to use on my GTA
This is a fast question, if someone would be so gentle to help me. I don't know the meaning if those controls:
1- what is the diff between air cond "Max" and "Norm"?
2- what is air cond "bi-lev"?
3- how does the two Economy modes work?
plus:
4- does the T/A has foot air?
THANKS GUYS
bye
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Joined: May 2013
Posts: 235
Likes: 1
From: Texas
Car: 1989 GTA
Engine: LS coming soon
Transmission: 80E coming soon
Axle/Gears: S60/35 Spline/S-Trac/3.73
Re: Info about HVAC controls
Hi guys
I have a list of thing I don't know precisely how to use on my GTA
This is a fast question, if someone would be so gentle to help me. I don't know the meaning if those controls:
1- what is the diff between air cond "Max" and "Norm"?
Max= recirculation
Normal= max AC w/out recirculation
2- what is air cond "bi-lev"?
Hi-lev= vents and foot wells
3- how does the two Economy modes work?
Economy= outside air w/out your AC compressor running.
plus:
4- does the T/A has foot air?- yes, as long as your lines are correct.
Please note: this is contingent that the colored rubber hoses behind controls and your flapper doors operate correctly. I had a 92 Formula WS6 that worked flawlessly, yet a 91 camaro that didn't work well at all. Upon replacing the heater core I noticed some marti gras beads must have fallen through the upper vent and prevented the doors from closing, and also the colored vacuum lines were switched back there...I'm guessing during a botched cassette player install.
Most of the time cars this old have been fiddled with by shatty "mechanics" much like myself 15-20 yrs ago lol. Grab some diagrams and make sure everything is copacetic. You'd be amazed how well the old non electronic systems work when they are in good working condition. :cheers:
THANKS GUYS
bye
I have a list of thing I don't know precisely how to use on my GTA
This is a fast question, if someone would be so gentle to help me. I don't know the meaning if those controls:
1- what is the diff between air cond "Max" and "Norm"?
Max= recirculation
Normal= max AC w/out recirculation
2- what is air cond "bi-lev"?
Hi-lev= vents and foot wells
3- how does the two Economy modes work?
Economy= outside air w/out your AC compressor running.
plus:
4- does the T/A has foot air?- yes, as long as your lines are correct.
Please note: this is contingent that the colored rubber hoses behind controls and your flapper doors operate correctly. I had a 92 Formula WS6 that worked flawlessly, yet a 91 camaro that didn't work well at all. Upon replacing the heater core I noticed some marti gras beads must have fallen through the upper vent and prevented the doors from closing, and also the colored vacuum lines were switched back there...I'm guessing during a botched cassette player install.
Most of the time cars this old have been fiddled with by shatty "mechanics" much like myself 15-20 yrs ago lol. Grab some diagrams and make sure everything is copacetic. You'd be amazed how well the old non electronic systems work when they are in good working condition. :cheers:
THANKS GUYS
bye
Thread Starter
Member
Joined: Oct 2014
Posts: 277
Likes: 0
From: Italy
Car: 1989 Gray ttop GTA
Engine: 5700cc
Transmission: auto 700R4
Re: Info about HVAC controls
Thank you very much BrutalT/A, very usefull
However I didn't quite understand what is the difference between "Economy Vent" and "Economy HTR".
Tomorrow I'll try to meticulously check how much air exits from every vent and I'll come here to tell you.
THANKS again
However I didn't quite understand what is the difference between "Economy Vent" and "Economy HTR".
Tomorrow I'll try to meticulously check how much air exits from every vent and I'll come here to tell you.
THANKS again
Member
iTrader: (2)
Joined: May 2013
Posts: 235
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From: Texas
Car: 1989 GTA
Engine: LS coming soon
Transmission: 80E coming soon
Axle/Gears: S60/35 Spline/S-Trac/3.73
Re: Info about HVAC controls
Economy vent will blow air based on temp setting without AC compressor"less strain on engine "better mileage". Economy HTR is your heater setting, just recycled coolant through heater core, so it's "economy" as it doesn't draw any power from your accessories.
Thread Starter
Member
Joined: Oct 2014
Posts: 277
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From: Italy
Car: 1989 Gray ttop GTA
Engine: 5700cc
Transmission: auto 700R4
Re: Info about HVAC controls
Today when I stop the car I tried the two economy modes, but neither lead to any air from foot wells nor front vents. Air motor was running but car was stop, perhaps it has to be started for air to flow somehow? Strange but real.
Sadly I think it could be as you said: some lines could be obstructed :'(
thanks Brutal
Sadly I think it could be as you said: some lines could be obstructed :'(
thanks Brutal
Member
iTrader: (2)
Joined: May 2013
Posts: 235
Likes: 1
From: Texas
Car: 1989 GTA
Engine: LS coming soon
Transmission: 80E coming soon
Axle/Gears: S60/35 Spline/S-Trac/3.73
Re: Info about HVAC controls
Today when I stop the car I tried the two economy modes, but neither lead to any air from foot wells nor front vents. Air motor was running but car was stop, perhaps it has to be started for air to flow somehow? Strange but real.
Sadly I think it could be as you said: some lines could be obstructed :'(
thanks Brutal
Sadly I think it could be as you said: some lines could be obstructed :'(
thanks Brutal
When I have the dash off, I always clean out the ducts to stop the rotted foam from flying through and wipe them with a Clorox wipe. Then seal the connections with the silver AC tape. Helps give a stronger air flow and since we have no filter cleaning them out helps with any funny smells.
I'd start by removing the console or upper console pod Depending on your flexability. You can usually access most of the big stuff back there. Make sure the colored vacuum lines aren't leaking as well.
How is the transistor that's on the blower motor under the hood?
They break and are cheap. Usually cause only hi and low speed operations. Nothing in between.
Last edited by BrutalGTA; Nov 23, 2014 at 11:10 AM. Reason: Added info.
Thread Starter
Member
Joined: Oct 2014
Posts: 277
Likes: 0
From: Italy
Car: 1989 Gray ttop GTA
Engine: 5700cc
Transmission: auto 700R4
Re: Info about HVAC controls
Thanks Brutal for the advices! This weekend I should have time to take care of this (and many other things 
)
What is that "transistor" suppose to be? I've never heard about it 
So sorry but I'm new of the "under the car's hood" world 
THANKS!
) So sorry but I'm new of the "under the car's hood" world THANKS!
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Supreme Member
Joined: Dec 2013
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From: Indiana
Car: 92 Formula WS6, T-top
Engine: 5.7L T.P.I.
Transmission: 700r4
Axle/Gears: Limited slip, 3.23 10 bolt
Re: Info about HVAC controls
My heater doesn't blow as hard as it should on any speed, could that also be the resistor, or is the motor itself going out? It blows at maybe 65% speed or so.
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From: Short Summer, VT
Car: 1985 Trans Am T-Top
Engine: 305 TPI
Transmission: T-5 5 Speed
Axle/Gears: 3.42 posi 1LE 10 bolt
Re: Info about HVAC controls
If it changes speeds but never as fast as it should, then it's the blower motor.
If it is only one or two different speeds on any setting, then it's the resistor.
If it is only one or two different speeds on any setting, then it's the resistor.
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From: Indiana
Car: 92 Formula WS6, T-top
Engine: 5.7L T.P.I.
Transmission: 700r4
Axle/Gears: Limited slip, 3.23 10 bolt
Re: Info about HVAC controls
Yip, it changes speed, but it never goes as fast as it should. Crap, that's $60 or so if I want to mess with it. I'll probably leave it alone, it works well enough for now
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From: Short Summer, VT
Car: 1985 Trans Am T-Top
Engine: 305 TPI
Transmission: T-5 5 Speed
Axle/Gears: 3.42 posi 1LE 10 bolt
Re: Info about HVAC controls
Also possible the blower is being gummed up with debris, old foam seal or rodent nest. Also check the harness on engine side for corroded or loose connector.
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Joined: Dec 2013
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From: Indiana
Car: 92 Formula WS6, T-top
Engine: 5.7L T.P.I.
Transmission: 700r4
Axle/Gears: Limited slip, 3.23 10 bolt
Re: Info about HVAC controls
Ok. Had a couple of those thoughts too. Wouldn't be too hard to pull the motor/connectors and check them for 22 years of crud. Thx....
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