Re: Stewart
Posted by HH56 On 2022/4/11 12:55:05
I don't think that is going to work for you. Cannot be sure but I think that is the 51-4 duct which is formed to fit over a hump in the firewall and is only a heater plenum.
The 55-6 heater duct is a two chamber affair. As I recall it is about 8" high and 4" deep on the passenger side end which has a portion that forms the distribution section and goes over the heater core air outlet. It tapers to about half that depth by the time it gets to the drivers side. Flat across on both sides with a dividing piece inside about a third of the way down to separate into the defroster and heater chambers. The defroster chamber has two outlets which connect to small 90 degree cardboard ducts that carry air to the channel below the windshield. There is an air control flapper at the passenger side end over the heater core outlet which moves about 90 degrees to select the heat or defrost function. I believe Cli55er was working with someone to make the proper piece but don't know if it was ever completed.
Here is what the 55-6 piece looks like. You might need to see if someone on the forum has a parts car or else Mike Dulinski may have one. I believe the front is fiberglass or plastic so is fairly sturdy but the back is cardboard and that can warp and leak or interfere with the flapper valve which I think also has a cardboard section. If you can find one the front can be reused. The back cardboard is stapled on and can replaced or flapper repaired if needed.
Attach file:
heater plenum.jpg (299.56 KB)
The 55-6 heater duct is a two chamber affair. As I recall it is about 8" high and 4" deep on the passenger side end which has a portion that forms the distribution section and goes over the heater core air outlet. It tapers to about half that depth by the time it gets to the drivers side. Flat across on both sides with a dividing piece inside about a third of the way down to separate into the defroster and heater chambers. The defroster chamber has two outlets which connect to small 90 degree cardboard ducts that carry air to the channel below the windshield. There is an air control flapper at the passenger side end over the heater core outlet which moves about 90 degrees to select the heat or defrost function. I believe Cli55er was working with someone to make the proper piece but don't know if it was ever completed.
Here is what the 55-6 piece looks like. You might need to see if someone on the forum has a parts car or else Mike Dulinski may have one. I believe the front is fiberglass or plastic so is fairly sturdy but the back is cardboard and that can warp and leak or interfere with the flapper valve which I think also has a cardboard section. If you can find one the front can be reused. The back cardboard is stapled on and can replaced or flapper repaired if needed.
Attach file:
heater plenum.jpg (299.56 KB)
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