I have tried an experiment over the last two days.
Each of the two mornings I have placed a radiator thermometer (the sort used
to balance radiators) over one of the heater grills. When the thermometer
reached 10 Celsius I started the engine and allowed it to idle, heater
controls being set to full heat. I then recorded the time taken for the
thermometer to reach 20 Celsius. On the first day I switched the engine
heater on and on the second I left it off.
On the first day (heater on) it took 2 minutes 30 seconds
On the second day (heater off) it took 4 minutes 15 seconds
Mine seems to work. :-)
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