IIRC aux heater only becomes active when ambient temp gets down to 6 degrees or around that .
If you feel that it is taking to long to get warm ,like already said it could be a thermostat issue ...opening to soon or not fully closing allowing partial flow through the radiator.
As a bit of a ‘bog ‘ just for *testing purposes* if you slip some cardboard in front of the radiator ( like ya used to see in’th olden days ...Ray will know ! ) just to stop air flow to it ....if it then gets warm much quicker you know your on the correct track .
There is a few other things that can cause slow warm up ....any ideas technical guys ?? Just out of interest so
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