Ok well my heater core was leaking and I just got it replaced but the guy didn't know where some of the vaccum lines hooked up at. Also my door needs to be manully closed to switch from hot to cold but I'll fix that. But he said my temp is running a little bit colder then usual and I just replaced the water neck and thermostat as well but got those from O reilys just one for a 318. And I was wondering could just buying that thermostat from them be the problem why it's not the temp it should be?