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97 STS
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Discussion Starter #1
I Have a 97 sts witch i just bought and the ac only blows out of the floor and will not change. also with is bank 1 and bank 2 on the engine i need to replace an 02 sensor on bank 2 and it sensor 1.
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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Diagnostic Trouble Code. Your car has a system built in which logs faults in different systems and mechanical parts and then allows you to use the DIC (Driver Information Center) - the dash panel - to recover and log the trouble codes. You do not need an aftermarket scanner. The car already has it.

Go to the top of the main page and look at the top of the Seville Forum. The sticky thread "How to pull codes" will direct you how to read your own fault codes. You want to scroll down the the URL with "obd2" in the address. (OBD = OnBoard Diagnostics).

In your car I believe the HVAC mode controls are in behind the glove box and the passenger side carpeted kick panel on the console.

In the diagram the rear exhaust manifold is designated Bank 1, so the front manifold (Bank 2) has the sensor in about the same location. In some Northstars there is also an after-cat O2 sensor designated Bank 1 Sensor 2. Click on the diagram to make it larger...........
 

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97 STS
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Discussion Starter #5
Thanks for all the help!! So the mode actuator is what is keeping the ac from switching of the floor well it comes out of the floor and defrost vents on the dash?
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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You'll have to look in your owner's manual for exactly what each mode really is, but the windshield logo is defrost: moist air goes to the windshield and the A/C compressor runs to dehumidify; the windshield/floor logo is some of each; the floor logo is most to the floor, some to the windshield and side windows; the vent/floor logo is just that, and; the vent logo is almost all dash vents.

That (those ?) doors in your car are down in front of the glove box and in the airbox down low in front of the console, toward the passenger side.

The heat control moves a door which sits in the main airstream and diverts some or all incoming air to the heater core box. The air mix determines temperature, not heater core coolant flow.

Recirculation allows cabin air back into the intake duct and seals off most of the incoming outside air.

In everything but defrost I believe you have the option to run the A/C compressor or not. (That may be 2000 and later)

SOOOOOOOO......there's a lot of floppin' and swappin' going on down in there.
 

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97 STS
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Discussion Starter #7
ok so mine is stuck to the floor only no matter where i change to controls to. What could be causing this? I would love to be able to have air other than on the floor!!! Not driven the car to much anyway got it for a seal on ebay $800 bucks and it was worth it!! The guy who sold it didnt really take to good of care of it. It looks great inside and out but had to change the FPR, Break line, and got the sunroof out and the track is bad. But it runs like a top now has 107000 miles on it and it sure is strong! I'm just fixing everything back. Still super happy I bought it I love working on cars.
 

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2010 DTS
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87,551 Posts
ok so mine is stuck to the floor only no matter where i change to controls to. What could be causing this? I would love to be able to have air other than on the floor!!! Not driven the car to much anyway got it for a seal on ebay $800 bucks and it was worth it!! The guy who sold it didnt really take to good of care of it. It looks great inside and out but had to change the FPR, Break line, and got the sunroof out and the track is bad. But it runs like a top now has 107000 miles on it and it sure is strong! I'm just fixing everything back. Still super happy I bought it I love working on cars.
Could be the control or an actuator. The actuator is the more likely of the two.
 

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1997 SLS
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550 Posts
Any chance this could be a vacuum issue? 97s are notorious for having rotted vacuum lines to the reservoir (I also have a 97).
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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The mode actuators and doors are in the firewall/dash area in front of the glove box and down on the passenger side of the HVAC stack in the front console area. Pull the inside carpeted kick panel and roll the floor carpet back.
 

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2010 DTS
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Any chance this could be a vacuum issue? 97s are notorious for having rotted vacuum lines to the reservoir (I also have a 97).
No, I would not expect it to be a vacuum issue. A loss of vacuum would default to the defrost mode.
 

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97 STS
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Discussion Starter #13
Ok so it was not get vac. inside the car at the black hose so.. Traced it out under the hood it Ts and on goes to a thing i dont know what is and and thing is connected to the Canister Purge Solenoid and the Canister Purge Solenoid is connected to the intake so i started at the intake the line going to the Canister Purge Solenoid is getting vac. but the big line going over to the thing that i dont know what its called is not getting vac. and the line that goes to my ac controlles hooks to that so does that mean the Canister Purge Solenoid is bad?
 

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The thing that you cannot identify is probably the vacuum reservoir. It holds vacuum to operate the system when you go WOT and vacuum drops to zero. Concentrate on it.
 

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1997 SLS
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Ryan, I kind of suspected this as 97s have a problem with a small segment of vacuum line to the reservoir. Get under the passenger's side in front of the wheel well just under the battery area. You will see a black plastic bullet shaped canister with a vacuum hose coming out. It's about a foot long and goes into a plastic straw-like nipple on the other side. This line gets rotted from battery acid drippings and road debris. Remove and replace the line and mode system might return to normal. Even if this is not the entire problem, that segment of line should be replaced every 3 to 4 years. Any automotive store can sell you a new piece. I usually put a bit of plumber's grease on each nipple so the new line slides on easily.
 

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97 STS
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Discussion Starter #16
Ok so here a pic of the problem I think. The red line is where a vac. line from the intake goes in to the Canister Purge Solenoid the red line does have vac. the yellow line is a 3 way the connects the Canister Purge Solenoid to two other things none of those lines have vac. the blue line goes from the 3 way to the part i was saying that i dont have a clue what it is the blue line has no vac. the green line is the line that goes over and inside the car to work the heater controlls and it also ts to the vac. canister under the battery does not have any vac either all the lines are good. I hooked the line that goes to the vac canister and into the car(the green one it the pic) to the one from the inake (the red one in the pic) all the controlls worked great and the vac. canister had vac. to it down under the battery. if hooked up they way it is suppose to be the on line that has vac is the one going to the Canister Purge Solenoid does that mean its bad? no vac. is getting to the other lines that are hooked to it
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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The CANP solenoid only supplies downstream (canister purge) vacuum on a command from the PCM which trips the internal valve, thus porting vacuum and vapors to the intake manifold. This usually happens at an off-idle steady cruise situation.

As far as verifying the correct hose hookups you need either the underhood vacuum diagram, a GM Service Manual, or a good pic from someone with the same exact engine.
 

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97 STS
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Discussion Starter #18
Well I have alldata on the car but it doesnt have the diagram so anybody with a 97 sts please look at my photo and take one of the same place so i can see it mine is hooked up right
 

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1997 SLS
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Ryan, just looking at it analytically, if the "yellow" line is dead, then the problem should be before that juncture inside the CANP. I also noticed the FPR is hooked after the "yellow" line so you could have a fuel pressure issue too. It seems to me the yellow line should have a vacuum at all times. Sorry, your engine looks different than mine - I have the 4.6L.
 
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