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The heater matrix uses 3 directional flaps to divert the air where required.
2 operate simultaneously opening and closing together from the hot / cold dash lever, the other controls flow to the demister and feet in that order.
Below is a photo of my heater box showing the interior passages and the 2 directional flaps that operate simultaneously
Excuse crummy drawings
Cold operation
Air passing in from the blower is directed to the open space above the matrix, the closed flaps sandwich the matrix allowing no air to pass through, instead the cold air passed right over the matrix and into the outer section of the heater box where it can pass through the dash vents or with control of the direction lever to the screen and / or feet
Hot operation
Air passing in from the blower is directed through the matrix via the upper directional flap, the hot air cannot enter the outer section of the heater box due to the lower directional flap closing this area off, instead the hot air is diverted to just the lower section of the heater box where it can pass through to the screen and / or feet
Modification
Cold operation
By removing the lower directional flap that covers the lower section of the matrix (the outlet if you like) the cold air can flow in exactly the same manner as before, no air is passing through the matrix so none is heated, the cold air can still be diverted also with control of the direction lever to the screen and / or feet as well as the face exactly as before.
Hot operation
With the lower directional flap that covers the lower section of the matrix removed and the dash control lever turner to HOT the upper directional flap opens allowing the cold air to pass through the matrix to be heated, the hot air now enters the outer section of the heater box where it can now pass through the dash vents or with control of the direction lever to the screen and / or feet, (I have shown the direction control flap closed but this still operates to blow hot air at the screen and/ or feet even with the dash vents open and you can meter how much flow is diverted through each outlet via the dash levers to produce an even flow through each if required.
The outer most dash vents don’t get a lot of flow if all the vents are open but they work ok if you just have the centre dash vents open and the feet screen off or vice versa – no real hardship to be honest however I have put a strip of self adhesive foam strip 4mm thick along the top of the upper control flap to open the gap up slightly keeping the flap from closing against the highest opening in the heater box (side vents) and this creates a seal to aid hot flow to it and prevent cold flow bleeding past.
I took a bit of time cleaning everything and replacing the foam seal because they were manky and the end result is a fully functioning air box that blows hot and cold to all outlets
The 2 flaps to be refitted
Hope that helps
Edited by Jin 20/10/2015 7:37 PM
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