Replace that brittle return hose
This 2001-2004 Mustang GT/2003-2004 Mustang Mach 1 return heater hose is the return hose that connects the heater core to the heater tube. The heater tube runs from the front of the intake back towards the firewall. The hose can crack and break over time. No need to have to search all over the internet for one. LMR.com has this high quality hose to get you taken care of. Replace your damaged hose with this Motorcraft hose and rest easy knowing it will last!
My supply hose bit the dust about a year ago. I went to the dealer and bought a new one before checking with LMR. Turns out, I could have gotten both hoses for what I paid for the supply hose from Ford. I installed the new PI intake, along with a slew of other goodies, and the new hoses went in at the same time. They're both prone to failure once you've put 100k or better on the odometer, so, do yourself a favor and change these out before you have to.
Ford Motor Company Genuine Parts, Motorcraft® Parts and Ford and Motorcraft Remanufactured Parts are all excellent choices when it comes to performance, longevity and value for your Mustang or SVT Lightning. And they’re all backed by a Ford Motor Company limited parts warranty*, so you know their parts you use are going to perform like they should. Put the same parts on your Lighting & Mustang that came from the factory! Shop LatemodelRestoration.com for Motorcraft oil, oil filters, friction modifier, spark plugs, and many other replacement maintenance items!