It will be located under the dash all the way to the firewall under the dash near the center and behind the air box. You can find its general locations also by finding the coolant lines that run from the engine to the firewal inside the engine bay. These lines are the inlet and outlert for the heater core and will run to the inlet and outlet of the heater core at the firewall. You will also see a rataing nut or two near the hoses at the firewall. These hold the heater core in place againt the insed of the firewall under dash and must be removed to pull the heater core out. The entire airbox must be removed to access the haeter core under the dash.