Hallo everybody.

I NEED HELP

I have started to remove the air distribution assembly on my 72 with ac. I´m planning to rebuild it becaue it leeks in heat when it should be closed.

I have removed the glove box, upper centre air outlet and the centre inner outlet that goes up to that one, centre instrument cluster, the air duct that goes to the right under the glove box, the radio is out. Everything is loose but i can´t get out the duct,s that is located behind the radio and goes from one side to the other. They are loose but i can´t get them out.

Please anyone. HELP!

 

Is it the one you see in the top picture? It's held in place with one screw on the left hand side (driver's side). If it's removed you should be able to tilt it out of the clip on the right hand side. It might be easier to take the the center duct out along with that part in one piece. It's held in place with 3 screws to the heater core box (left of the metal flapper door you see in the pic) and slides out to the right.
Nick

 

There is a screw on the back side.. See number 8

 

Don't ask me how I got acquainted with that threaded stud through the firewall....Not #8 I guess but still a factor.

 

Hallo again.

Thank you for your quick replays.

Maby i haven´t been able to explain what i really mean, sorry for that because my english is not always what i wish.

Thanks to the fine drawing from Wilcox i now can se that the proper name is Center Outlet Duct. It must be so because it´s located between the instrument cluster and the core box itself and in hight it is located just behind the instrument.

It´s loose but i can´t get out. I assume that it should be neccesary to get it out to be able to take out the air distribution assembly or maby it´s called "Heater Core Box", where the heater core is located. I also assume that it should be possibly to slide it to the right to get it out.
I have tried to twist it and pull but i must have missed something even if it´s loose. I´m afraid that i might brake something behind there if i continue with more force.

I really do not want to dissmantle so very much more under the dash, then i think i will give up. Even if i really don´t want to.

Thanks again, looking forward to read more from your wisdom.

 

You can install a shut off valve on the heater hose line, that will keep the heater core cool.

 

Do you have the screws out of the wiper switch plate. On cars with a/c you have two screws that pass through a bracket made on the front side of the duct?

 

Hallo again.
Hopefully you can se a picture above that shows the duct that i´m talking about. I´m holding my hand on it.

As i earlier said it´s loose but i can´t get it out.
As i understand it i must get this out to get access to the heater core and to be able to get it out.
Yes i have those to screws loose, i have the wiper switch plate removed.

Hopefully i have succeded to get the picture on place.

If not so you can look at the picture with web adress below.
There you can se the duct that i´m talking about.
It´s the big one in the middle.

As i have said before my questions are these.
Question number one, how do i get it out without dissmantle moore than i already have or is it impossible to get it out without removing the top of the dash
I must say that it looks impossible. Or is it not neccessary?

Question number two, should i just remove the screws that hold the heater core itself and slide it to the right behind this one and disconnect vacuum wiring and so on when i can reach it.
Is this possible with all the vacuum and so on connected to the AC/heater control, is it really possble to get it so far to the right to be able to disconnect them?

If i must remove the dash, the interior between the chairs and maby som more i give up.

But i´m still possitiv about it so thanks in behalf for your answers

http://i103.photobucket.com/albums/m...project064.jpg

 

It's hard to see in your pic but do you have the screw (duct to heater box) off? You can see the metal bracket and screw hole on the box in these pics.

(And your English is just fine!)

 

Hallo again.

Thank you for the answer paul 74.

The picture i showed is not on my car, it was just ment to show the duct i was mening.

I have that screw loose.

It seems to me that you have taken out the heater box with the big duct in front of it still on place, it´s that correct?
I really do think so when i look at your pictures.

If so can you then please explain for me how you did when you disconnected the vacuum hoses?
Was it possible to do that efter you had slided the heater box to the right, is the vacuum hoses that long so it´s possible to move the heater box so long with them still connected?

Or did you disconnect them first before you started to move it to the right?
If you did that first, from where did you reach them?

Late now here in Sweden (23.45).

Thanks so long.
By, by

 

My memory is failing me as I did that job in July of 2008.

Yes, all the vacuum hoses have to come off. One pic shows them labelled with green tape.

The large center duct is simply moved back. I don't recall moving the core assembly to the right although I did a lot of wiggling initially. The trick seemed to be pulling the top a bit out (remember that firewall stud) and then pulling it upwards. This allows the core spouts to clear the channel to the bottom of the car. If you don't pull up the spouts will get jammed in that channel.

 

I did the heater core on my 74' convertible a few years ago and remember having great difficulty getting that center duct out. As I recall I had to first remove the tube brace that runs from the steering column area to a bracket near the floor. The outboard end of the brace is easy to see and to remove the attaching nut but getting to the bolt and nut on the inboard end on the steering column is a rear bear but it can be done.

 

Thanks again for your answers.

The picture how to do this is getting clearer and clearer for me and that is because of all your excelent help!!!!

However i have som more questions. Please have patience with me.
I´m afraid to broke something you see. And of course i want to get it together again so it works properly.

Paul, first question.
It seems to me that it`s missing a part on your heater box?
Shouldn´t it be a small part in the thinner end. A part that have a vacuum actuator on it?
If so, did you then take that away from the rest before or after you took it out from the car. And then how?
Second question.
How did you disconnect the vacuum houses, i mean from where and how did you reach it with your hands?

Robert.
Thank you for the answer.
Soun s tricky but possible to do.

 

I wish I could help further but you have lost me at this point. There is nothing missing from my heater core box? To this day it works fine. As to removing the vacuum hoses you just pull on them....? And of course remember where they came from. I mentioned green tape labels earlier. Where are you with this project?

 

Hallo agin.

Paul, you are very helpful and i must say that you have the patience like an angel.

This is what i meant with the "missing" part.
http://www.ebay.com/itm/Corvette-Ori...sories&vxp=mtr

It now looks obviece to me that you have this part remaining in the car after that you have removed the other core house.

This far i have removed everything except the rubberhouses (drain it first ofcourse) in the engine compartment, the screws that hold the core hose, vacuum houses, heat adjusting cable.

I´m verry sorry to say but it,s all my fault that you didn´t understand me.
After looked at your pictures and some moore it´s obvius that you are absolute correct and i´m confused.
SORRY for that!!!

When i have got it out do you then recommend me to change something else just to avoid to open up this side under the dash again?
Vacuum houses, actuators or something else???

Regards Anders from Sweden.

 

Paul it seems as though you know what you are talking about -- I need to pick you brain -- I have a 75 with AC and AC works fine at all 3 level and the defrost and the heater also works but -- when I have in vent at the same fan indication that I would have in AC only a little part of the AIR is coming out of the vent --- any Idea as to which vacuum line I should track down or what I should look for -- Than You very Much and Happy New Year !!!

 

Refer back to post #2, this shows the piece you are referring to attached to the whole assembly. I did this job back in 2011, so my exact memory of each puzzle piece is a little fuzzy, but if I recall correctly there are screws that are not obvious that hold many of these pieces together at their joints. I also recall that the lower portion of that center pieces slides together from one side to make the connection