Check the fuse first as that's easy enough, then coolant level, then the valve that lets warm coolant into the heater matrix
will do (there's a few I think) coolant level is fine as had the serpentine belt come off and take the hose with it so had to replace and top up. By valve I assume you mean the heater control valve?
Did you bleed the system after? There could be an air lock and the heater is the highest point
@pryally started
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Check the fuse first as that's easy enough, then coolant level, then the valve that lets warm coolant into the heater matrix