Either the heater matrix is silted up or there's insufficient coolant flow to reach the heater. This is typically due to a leak and therefore air in the cooling system. Check the coolant level. If OK try a top up and bleed according to the method given on the forum. If you can't find it by a search, request a link. The V6 typically leaks from the thermostat housing. Check for puddles in the Vee between the heads
TC
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