Does anyone remember the old leatherette radiator muffs of the 50s and 60s. We had very cold winters then, (like now 2010 !) and cars would not warm up properly on short journeys. There is a lot in what Kaiser says, the heater is actually cooling the engine just like the radiator with ambient air at 0 or below coming in rather than the 7-8c of our "normal" winters.
At one time there were Summer and Winter thermostats as well. I have noticed with my MG Rover plastic thermostat housing the heater still is taking some time to heat up in this cold weather.
Kaiser - I still have you ally housing in the garage, as the plastic one is still good with no hint of a leak. If I sell the car before I fit it, your housing will be supplied to the new owner !
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