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I have a '73 454 and just replaced the heater core. What is the correct routing from the core? Straight up and forward by the exhaust pipe or threaded up inside the fender and over some AC stuff? Or??? I have an older Mid America manual, but haven't found the hose routings. Thanks
Ran-D
I believe the hose run just above the frame and go under the AC compressor. There is a holder under the compressor that bolts to the AC compressor support that the hoses go through.
Roger
There is also a bracket on the inner fender just under the radiator overflow tank. With AC, they loop down from the core, next to and above the frame, up through that bracket, under the front of the compressor thru a bracket, and up to the pump and intake manifold. I wish my camera didn't just die or I'd shoot a picture. Without air the routing is similar, except they start out straight out of the firewall, and obviously there isn't a bracket on the compressor. Joe
My 73 AIm shows the hose routing on Page 127(No air?) and page 128(Air?) hope that helps
Since my 454 with AC does not have the room or a bracket under the compressor, I did a little more research. If you check page 57 of the AIM, you'll see that sheet 71 references heater hose routing for the LS4. Well guess what, no sheet 71 in my manual. I contacted Mid America and their manual is also missing sheet 71. However, Jody the tech guy was kind enough to check other years and found that the '74 manual has sheet 71 with 454 hose routing. It IS different from the 350 routing. He sent me a PDF file of that page. Anyone wanted a copy, send me a PM with your email address.