My heater is not blowing hot air?!?
Ok i know there was someone earlier that asked this same question but my circumstance is a little different. My engine is brand new, including the thermostat, water pump and the radiator (along with other things). We recently added a coolant booster so that the engine runs a little cooler (for performance purposes), now my heater hardly blows any hot air unless im driving in a really high rpm (the car is standard, '99 mustang V6) is it the additive? or something else?