On to the "AC Evaporator Build"
I wanted AC in my car, but I didn't want an underdash unit. Larry Hubby's AC build inspired me to copy his evaporator, but with some changes specific to my car.
You can see Larry's AC build here -
http://www.914world.com/bbs2/index.php?sho...;p=2530141&So first, I ordered the evaporator and the fans like Larry used.
Click to view attachment Then I started on the "shorty" air box to fit the cowl. I cut down the factory air box and carefully removed the rain shield inside of it.
Click to view attachmentClick to view attachment In the third picture, I show where the rain shield was cut loose.
Click to view attachmentOne of the things I noticed when I was reading Larry's thread, his opening for the outside air door was really small. So I removed the oval intake from the factory fresh air blower, and attached it to a sheet of ABS. Then I created a door and an actuator rod.
Click to view attachmentClick to view attachmentI left the rain shield off for now. I will reattach it later. That way I can see how much the door opens when it is moved.
By now I ran out of super glue, so I had to order more. Yes, it is assembled with super glue. My father designed AC units for VW for years, and they used super glue extensively. The whole Vanagon AC unit was assembled with it. I got the glue and the accelerator spray. Just put the glue on one part, and spray the other. 5 seconds after contact, it is bonded.
Next, I start making the bottom box to house the evaporator.
Click to view attachmentClick to view attachmentClick to view attachmentThe box has a sloping floor that will carry condensation to the drains at the front (that I have not installed yet).
I also put in a couple of pieces of ABS to act as a shelf to hold the evaporator up off the bottom.
Click to view attachmentI test fit the evaporator core, and everything looked good.
Click to view attachment Next I created a ABS plate to hold the fans. I used a dremel with a circle cutter to make the holes for the fans. I had to slightly enlarge the holes to get the fans to clip in. I notched the corner to clear the evaporator lines. It sits right on the core, so I didn't have to glue anything.
Click to view attachmentAfter that, I created the air distributor that goes on the back of the unit. I am going to route AC to the defroster ducts to push dry air over the windshield to defog it. I am going to feed the two outside vents in the dash, and to a 911 center vent in my Geddy design dash. So I setup the air distributor to be able to switch between the defroster vents and the center vent. The elbows at the back feed the defrost ducts, and the big outlet in the middle feeds the dash vent.
Click to view attachmentThis is a picture of the door on the inside of the box.
Click to view attachmentI hooked up the fans to 12v, and checked the airflow. It moves a lot of air through the evaporator core!
I still need to add the fittings to hook up the vents in the end of the dash. There are no doors for them. They already have doors in the vents.
I started creating the connection between the shorty air box and the top of the evaporator core.
Click to view attachmentThe tabs on this are to align it with the bottom box. I may need to add some small screws to hold the box together when it is in the car. But I will only put them on the side where they are not visible.
Here is the top box installed on the bottom evaporator box.
Click to view attachmentClick to view attachmentI again ran out of super glue. Gotta go to Ace hardware and get some more.
Next steps are to put in the fittings for the side vents, and the fittings for the recirculation connections. I am going to connect the intake to the inboard connections on the factory air control boxes on either side. I will wire them open to the foot well so they always pull inside air. Closing the flap in the top of the evaporator will force all the air to come from inside.
I set it next to the factory fresh air box. They are only a few millimeters in height difference. I need to pull the gas tank to check the fit in the dash.
More updates to come as I add more to it.
Clay