I have a 02 lincoln LS 3.9 v8. Upon turning on my heat a couple weeks ago to make sure it was ready for winter I found out that it wasn't! I started to do some troubleshooting so I checked my coolant and topped that off still no heat. Next I moved onto replacing the thermostat that I had bought last year because I figured its time coming soon that I never got around to still no heat. Now upon looking around in the engine compartment I noticed that the actual rubber hose that is the upper radiator hose right where it clamps onto the plastic housing that i think they are calling a coolant crossover is bulging way up when the car has been running for say enough time that it takes to get up to temp. Now these are my facts that I know and can share that the degas bottle is full of coolant, i tried bleeding the system with the hose bleeder that is right next to the degas bottle, none of the three hoses going to or coming from my heater core has any type of temp going in them, the bottom hose I'm imagining is a bypass hose of some sort but still it has no hot temp either. Any help would be very much appreciated!