^^^^ Attach fail. Use "Go advanced" mode, otherwise attachments don't work (although there's no error message).
Well, it was yesterday, not today, but I pulled the pooched heater core out. Lotsa fun on the non-A/C "HI-OUTPUT" trucks. At least it happened in May and not November. I just did a real quick (think Indiana Jones with the diamond and the bag of sand) swap with the bypass hose, without draining the system, and lost maybe a cup of coolant. Now it's the waiting game, for a Motorcraft core (all the aftermakets seem to be aluminum).