I have an 04 envoy xl that i just bought, took it out for the first trip and it overheated on me, got it home and found coolant leaking from just above the frame on the back drivers side wheel. Im assuming this goes to the the third row heat. Is this a solid one piece line from the motor all the way back? I cant find any splices in it, im assuming that buying this would be a dealer part? I'll probably change the thermostat as well since i have no idea when it was changed last, just unnearving when it heated up like that on my maiden voyage lol. Kids love the space and it rides amazing so i want to make sure i fix it up right.