Heater not very hot

The heater matrix is as high if not higher than the top rad hose iirc. Means you can get an air lock in there.
Try bleeding the system whilst pumping the matrix pipes by hand
Sorry for hijacking.

Mine is ok but temp needle is reading low since for two months now. Any ideas with this problem. I don't want to do guess work cos it will be waste of time to do it.

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