I have removed every bolt and nut I can find which could even be near the heater core box and still it won't come. Under the hood AND under the dash... I may not be seeing one. There aren't many left. Is the bolt behind the throttle body on the firewall under the hood connected to this box ? It would be a real help if I could see a picture of the locations. Autozone site is no help. Haynes is no help. Is there a site which shows these locations ? If I remove many more bolts, the truck will fall apart. Help ! Thanks