The million $ question what is demist verse defrost. Demist sends air to the screen while retaining air flow to the cockpit . While defrost sends hot air to the screen only.
There is a wonderful article floating about on the workings of the heater box which needs to be placed on this forum for future reference.
This advice is from memory as I have replaced my heater with a "VINTAGE AIR" heater and cooler system which utilizes all the original piping so I hope I have it right.
|