I just purchased some non ac heater controls that are vacuum operated from a 91 ta. Will this be hard to install in my 85 ta that had ac? Or should it be almost plug n play? Here's a link to what I bought

http://pages.ebay.com/motors/link/?nav=item.view&id=281180587370&alt=web

 

I'd be interested in knowing that too.

 

I'm not sure what that mishmash is, but I don't think it's going to help you much.
It looks like a non ac faceplate that someone put on a reg ac controller. The factory non ac delete does not use any vaccum controls. It uses a cable for both temp and zone control. Factory cable controller needs an ac delete heater core box to go with it. Ac box can be modified, but you'll have to pull it out.
I think that might be a pile of junk you bought.

 

I thought I read somewhere that the 91 and 92 non ac controls were vacuum operated like the ac ones. Can any one confirm this?

 

I've got a 90-92 ( non-AC ) Camaro heater control and it's VACUUM controlled.

All 82-89? Camaro non-AC controls are cable operated. Starting in 90(?) they changed to vacuum like the AC controller. I ASSUME that the same change occurred with the Pontiac line-up those same years as well.

Installation should be as easy as re-moving the original and re-installing the replacement.

 

Good to know. What about the heater a/c box under the hood. Will one of the early model boxes without a/c work on a late thirdgen? Like, will an 84 non a/c heater box work on a 91 that had a/c?

 

Yup,.... All non-AC boxes will bolt up and work fine. The Blower motor wants 12 volts and ground and doesn't care how it gets them. I installed a 91 AC delete box into my 84.

The difference from AC to non AC engine bay box is the resistors. Non-AC resistors allow only 3 speeds,... the AC resistors allow 4 speeds.

** white85transam installing the non-AC controller means the controller **** might only have 3 speed settings so regardless of the resistors used on the engine bay box - you might only have 3 speeds with the non-AC controller installed. The resistor pack can be swapped easy enough,.... but I'm not sure if the blower control **** can be swapped from the non-AC controller for the 4-speed (AC) version,..

Maybe !?!?

 

I'm not sure about being able to use 4 speeds I know the **** has 4 clicks but one is off and the other 3 are the speeds. It's been so long since I put my non heater box but it's setup so I only have 3 speeds right now any way so no loss. I only have one relay by heater box. I'll have to look into trying to get a faster speed for high. I received the non ac controls today and it looks plug n play. I'm gonna dig into Wednesday after work. Does any one know how to disconnect the cable to remove the controls? Do I take it off the controls or the blend door first?

 

Will the vaccum zone control match up with the 85 ac dash assembly? They may both be vaccum operated, but since non ac cars don't have as many zone selector positions, it seems there might be some misalignment.

 

Double post

 

The lever for zone control operates a piece that turns and sends vacuum to the areas that are needed for each function. The ac has more positions but the first ones are for ac only. The non ac and ac have the same 6 vacuum lines that hook to it and all go in the same position. Looks pretty straight forward. I'll update as soon as it's in.

 

If the factory AC controller & wiring harness ( has high speed relay ) is re-used with the AC delete box/motor and the 4 prong resistor is used you'll get all 4 speeds. (non-AC resistor has 3 prongs ) Since the non-AC controler only has 3 settings, you're gonna' only get just 3 no matter what !

Good question ! I've never swapped the controller - just recall that the later controller was vacuum controlled compared to the early Cable type.


I'll watch the thread for updates !!

 

P.S.

Take the cable off @ the controller end.

There is a little plastic tab that holds the cable in place @ the controller. Use a small screwdriver to push this tab out of the way so the cables' plastic 'tounge' will slide free from it's mounting slot on the controller.

 

Ok so I partially installed the controls today. I had to re wire the fan speed plug so all the speeds worked in the right order. Also had to connect power wire from fan speed plug to the other brown wire that gives power to the ac selector since on non ac the off is on the **** instead of the selector lever. It wasn't too hard to figure out. The only issue is my 85 trans am ac controls only have the 5 vacuum lines on the diaphragm. It doesn't have the one pink one that has the "y" connection or the grey vacuum line like the later model ac controls do. I just mounted my lines and diaphragm to the non ac controls and it's not perfect but it works. The bi level is more like just the vents by the bottom of radio pod. Vent is just the main dash vents. Heater is the vents with a trickle of air out of the defroster. Defroster is just the defroster. Hope this helps.

 

i just removed the 2 buttons on the slide controls.(front)
unscrew the face.. install the new face..put back in the dash..

did not have to mess with anything more... i have a 92.z28


the face i removed from the control itself. the 2 buttons come off the arms.. then remove the screws on the back of the face.. reinstall the new face. on the old controler.