Nope, it doesn't go to the heater. Just from the rear of the block. It's right under the short one that goes to the throttle body. and it snakes along the block and into the oil cooler.then one from the oil cooler goes into (or out of) the heater core. Not real sure which way the coolant runs through the lines.Racin93lx said:i cant place the one your talking about in my head ... not the one going into firewall heater core is it ?