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I'd never considered the Dolomite heater inadequate, till I went on the RBRR in Mahesh's Sprint in 2018.
It worked OK ish in the front, but all 3 of us in the car still needed to be wearing jackets nearly all the time.
But the back seat area was absolutely FREEZING, particularly if you were trying to sleep!
It was not unseasonably cold in October of 2018 and the car and it's heater seemed to be functioning as well as possible, it wasn't overcooling or anything like that. But in 2000+ miles, we never needed to turn the heat DOWN from it's maximum output!
On the other hand, same journey in my TR7 powered dolly, we never had teh heater more than just "warm" and we were never chilly. And we are all from down south, so apparently "softies". We did g=have a blanket thing =y for the sleeper compartment, but think that is reasonable.
I reckon it is mostly down to the heater matrix. If sludged up a bit, I think they produce much less heat as they are a bypass design? I remember a rad specialist saying if just a couple of tubes were blocked in a herald matrix it would make a big difference. And sadly flushing is unlikely to clear a blocked tube as the water flow will just go via another tube or bypass. Chemical attack may help, but really a new matrix should do the. Saying that, if a bigger matrix will fit, go for it.