Heater control attachment to bottom edge of dash

The MGA hearter control installation may be a bit confusing, as not all parts required will be shown on any one page of the shop manual or the parts list. This stems from the heater being treated as an add-on option. The dash installation with lower edge brackets is part of the basic car. The heater control panel with the additional fasteners required will be shown with the optional accessory heater parts.

To make the story short, reference the picture above. The dash lower brace brackets with captive nuts are positioned on top of the lower flange of the dash. For the basic installation (not shown) there are short screws with lockwashers and screw heads on the bottom. When the heater control parts are installed there are long tube spacers immediately under the dash flange. This is followed by the heat control bracket and lever assembly, short tube spacers below that, then the plastic facia panel, and finally special long screws with the heads on the bottom.

Moving the heat control lever to the left draws the control cable out to close the water valve (heat off). Moving the lever right pushes the control cable wire in to open the water valve (heat on). If you mount this manual control assembly upside down it works backward, giving heat when you expect cool or cool when you want heat.