yeah I think the Kadet is the same as the astra.
I have a heater matrix from an escort. I know it is aluminium and yes I have a copper block I have some car antifreeze with distilled water in the circuit so far it seems ok. It'll be interesting to see if the anti freeze and distilled water prevents the corrosion.
The Nova/Astra one looks pretty good might have to take another trip down to the scrappy
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