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when i got the car the heat wasnt hooked up the guy i bought it from said he thought the heater core leaked but didnt remember so i pressure tested it with nitrogen to about 13 psi about what normal coolant pressure is and it held so i hooked up the lines and and bled it and the heat works but only when your sitting still if i start to drive it slowly fades away so i figure thermostat might be bleeding through so i replaced it and still the same thing i have herd that the cars that had factory air which mine did someone removed it
had a valve that would stop the flow of hot coolant going to the heater core i do not see the valve anywhere it appears that the lines go right from the water pump and the top of the intake right to the heater core lines sticking out of the firewall is this valve located behind the dash? cause i cant find it..is it also possible my heater core might have a partial blockage....please help