heat doesnt work ,fan blows but heat doesnt come out . on 2002 Infiniti Q45

i replaced controll head , thermostat ,and flushed cooling system .

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1 answer 2 comments
do you mean no air flow or just cold air??

Roy
just cold air
check the temp of the inlet and out of the heater core. they should be around 170 in and 150 out. if not, the heater core may be clogged

Roy