Clayton Dewandre, round type heater. Motor made by Klaxon. An optional extra at £15 6s 8d.
For optimum heat transfer ensure heat exchange coils are kept free from dust.
The open design of the heater tends to collect dust and should be cleaned regularly to ensure good heat transfer.
To install the heater -
1) remove the two blanking plugs, center of the bulkhead (if fitted), and fit the heater with the pipework protuding through the rubber grommet into the engine bay.
2) 2 air ducts connect from the heater to the vents, to left and right, just below the windscreen and are best secured with jubilee clips.
3) 2 steel pipes convey the water from just behind the thermostat housing (top of radiator) and a curved steel hose at the same level as the fuel pump (bottom of radiator).
4) there may be brass valves (at top, or at top and bottom, or none fitted) to which to attach the steel pipes by way of hosing and clips. If the valves are not present, blanking plates will likely have been inserted, or the bottom curved steel hose may have rusted and been replaced by a continuous hose instead.
5) ensure brass valves are open, and remove radiator cap until all the air has been expelled from the system.
The motor does not seem as quiet as reviews of the period suggest, and typically the unit will draw 1.7A (for a total of approx. 20W power consumption). This (reconditioned) unit tested also tended to 'rattle' slightly, suggesting the bearings might be very worn.
The Briggs-bodied cars may have been offered a Smiths 'Hadees' heater as optional extra, and, being an after-market accessory, the Tudor 'TwinFan' heater appears to be a re-badged Clayton 'Dewandre'.
Whilst the later Barker pipework to and from the heater probably consisted of 90 degree angled, 1/2" steel tube, connected with rubber hose pipe and jubilee clips, the Briggs may have been fitted with a larger bore, flexible rubber tubing, clipped to convenient anchorage points in the engine bay.
If replacing, or remanufacturing, the Barker heater pipework, note that there are 2 sections:
It may be advisable to work with stainless steel or standard 15mm copper pipe to avoid future corrosion problems.
None yet.