I searched the forum for a post on how to dissasemble the Evaporator Assembly (Box)... did not see one. Can anyone offer input/pics?

I got the assembly ready to work on over the weekend, but only quickly looked at the unit. It seems there is a panel that is rivited on.

Also - I want to do the C4 blower motor upgrade..... looking for pics too.

BTW - how in the heck does all that debris get in there? I was thinking that it got sucked up from the interior side of the system?

 

Well, the junk gets in there from outside, at the pass side of the wiper tray is a screen that is supposed to stop it but doesn't.
Durango and a couple others have posted pics of the C4 fan upgrade, do an advanced search, pretty much just a spacer install kind of thing.
Do you have pics of where you are on the thing?
I just did mine, was pretty easy, the box bolted on from the firewall side except for 2 screws from the inside. There are w few screws that hold the 2 box halves together. I blew off the $50 seal kit and made my own for about $10 in home depot weather strip.

 

I am just starting - have the box off - and bought a kit from DrRebuild. So - will take pics as I go.... will look forward to gaining expertise from you

 

Here are some pics of the Evap. Assy and Heater box off of my '75. I had to paint both halves of the evaporator box because I had to glass up a couple of holes. If you need any specific pics, let me know. I wont be putting it back in the car for several more weeks.

 

cool - I will most likely get to do this over the weekend.....

 

OK - I only had an hour or so to play with the car,..... I dissasembled the evaporator assembly.

Look at the crap that was in there !!!!!!!!!!!! I'll bet 65% was blocked by debris and maybe 20% was TOTALLY stopped up with black gunk. And FYI - I did not move any of it around - that is actually how it was.... That is a Mallor Pkg label that looks like really old. I wonder if an animal (rats) could have crawled up in thru the drain hold and maybe started nesting in there... boy I bet if they did, they got their ars burnt when Mr Big Block heated up.. heehee

That said - I wanted to state that if this evaporator worked MAYBE at 30% efficiency and the rest of the system was maybe 60% at best, we are talking 30% of 60% - which is really bad. Now that I have seen this - I would assume the basic Corvette A/C system will work just fine - if it is just clean and done correctly..... I mean REALLY done correctly.

I have some (3) holes in the housing - will have to fix, along with a bit of rust on the riveted backing.

Upon re-assembly, I plan to cover the drain hole - see pic. At first, I thought of a screen on the inside of the casing, but since another CF member advised that the leaves come in from the wiper assembly area, I will not do this. Instead, I plan on a screen on the outside, with a rubber hose or darinn line if you will. My friend said that his 72 Cutlass came with a flexible rubber hose that was round on the one end attaching to the drain and then kinda closed or smashed flat at the end - I will not tell you what he described it to look like

I erroneously thought I had to drill out some rivets to take the 2 'halves' apart. Rather - the halves came apart with the riveted backing on one half. I see where I could and may have to take it apart based on teh fact that I have a bit of rusting going on - but I believe JB Weld may come to the rescue.

Check out the evaporator - do ya think that is original?

Also - I see a part on my heater vent box (interior side) that needs some plastic fixed - what is good for this? I need to mold or add a lip back in an area of about 1.25" x 0.5".