It seems more and more common for people to call and say their Sprite heater blower is not working. This is often because they ancient heater fan control switch is no longer working, and sometimes because people don’t have a sense of how these dinosaurs operate. So here is a video to describe the proper operation of Sprite Mark one and two heater control cables and switches.
These switches are counter-intuitive. One would think that pulling the “H” knob gets you heat. In reality, pulling the H closes the air door and blocks air flow through the heater box, effectively setting your sophisticated Sprite cockpit air control command center on “recirculate” which is a bit of a joke since these cockpits leak fresh air through every seam and hole. Alas, closing the flap in the heater I suppose has some use if you wanted to block off a cloud of noxious fumes from entering into your heater as you travel down the motorway… but those fumes will all just travel around your leaking sidecurtains anyway. These cars are so far from air tight that this is all quite humorous.
In any event, most Sprites we see don’t have these flaps hooked-up anyway, and so we just sell a blower motor power switch and knob that looks original when installed in the dashboard. With our switch, you can’t tell there is no cable attached unless you poke around under the dashboard or behind the blower motor and this is what I use on my own personal cars.
