It was frigid with the wind blowing on me. I cranked the heat up and that didn't help a whole lot. I don't think Jag made a very good heater. No, I don't think they did.
One would think that getting heat from the engine to the interior of a car would have been a fairly easy thing to figure out how to do well. It's basically a matter of running hot water from the engine coolant system through the firewall and devising some kind of heat exchanger
This is Jaguar in the late 60s (when it was developed). They probably did something to shave weight or just didn't give a fuck. I suspect it'd be frigid in the winter - even with the top up. The engine temp was just fine. So, it should have put out adequate heat.
They may have expected the drivers of those vehicles to use a different model on the cold days
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