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It's possible the Radweld is responsible if that's the case, especially if it started happening just after that.
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That's my opinion as well. Is the interior heater working OK or does it have reduced output as well?
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Just wondered though, are thermostats like they always were, or has the technology moved on since the 1970s
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Pretty much the same, there were couple of cars that used sensors and electric valves but it never took off, possibly due to higher cost and complexity, maybe even reliability.
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But it's not risen above the section marker above 90 (whatever that represents - what is the point of these if you don't know what they mean?)
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Pressurised cooling systems are good to 120C so that's what the red marker is for. If you divide markers between 90C and 120C you will find the value increment for each marker.