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Carl Goldberg Falcon 56
MkII
Updated!!
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I also wanted to investigate
"weak" airflow from my center vent. Note that I did not say "no air"
which would typically indicate a bad solenoid. I said "weak" by which
I mean I was getting air, but it was anemic, and the defrost seems to still
blow a bit with the AC on full cool. The center vent would actuate,
just (it seemed) not all the way. On full cool, I would say the
"force" of the air was as follows: Side vents, 20%, center vent, 20%,
defrost vents, 20%, knee vents, 20%. I thought at least half the
volume should be center vent. Anyway, I don't know how to describe my
gripe any better than that.
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Next,
you need to drain the coolant to a level below the heater core. I did
most of this with a siphon thru the crossover fill tube. For the
remainder I pulled the heater core inlet hose and siphoned from the coolant
rail. Then, I blew air into the inlet hose to push any water in the
heater core on thru and out the return hose. That way I had minimal
water in the core itself. The siphoning can take a bit so I start it
first and let it run while I opened up the dash. |
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Next, remove the instrument panel, glove box
liner, console sides by driver and passenger knees, and the panels above the
driver and passenger knees. |
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There is an access panel on each end of the unit that needs to be removed. They are held in place by screws on 4 little ears. The panel on the left side is split to accommodate the heater pipes. The back half can stay put between the pipes and the unit, but you do need to remove the screws so you can move it slightly out of the way. Here is what the panels look like after they are removed. |
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After removal of the left hand access panel, you can see that the foam is looking a bit nasty.. Go ahead and unbolt the pipes. Put some paper towels or rags underneath to catch any leakage. |
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The right hand access panel is behind the AC unit ECU. (Sorry, the pic is out of focus...)
The ECU is held in place by one screw on the front behind the lip of the glove box opening...(the blue tape is mine.. original is actually black)
...which goes on this little bracket...
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Once you unbolt the ECU, peel back the black tape to expose the right hand access panel. It is not necessary to unplug or further remove the ECU. |
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Remove the access panel and the end of the heater core is exposed. Some nice leakage here. Ick. |
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You can now slide out the core. You have to maneuver it a bit, but it will come. Nothing else holds it in. |
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Ummm.. Yeah. My expert opinion is that it is leaking :-) |
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The new core goes in just like the old one came out. Be careful around the vertical wires, they can get hung up on the access hole. |
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Everything only goes together one way and seems to line itself up pretty good. Push the new core all the way thru. This was a test fit, I pulled it back out and put a piece of foam between the pipes. The edges of the heater core need foam all the way around to properly route the airflow. |
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I decided to slot the holes in the actuator a bit and see if I could get more travel. (There was not enough adjustment in the rod to do any good.) There seemed to be enough room to slide the actuator farther away from the rod (towards the back of the car.) Well, this all took a lot longer to do than it did to write, but the end result was 100% success. The center vent works much better, flowing about 50% of the total air in the dash. The AC system is much more effective now.
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