No heat coming from all vents. Air blowing out of all vents, just cold air.

What is your question?

Temperature gauge is reading normal. Nothing leaking on the ground. No smell in the cabin. There were no problems observed that led up to only cold air coming out of the vents. Yesterday I turned on the truck and cold air was coming out of the vents, no matter how high I set the temp. Prior to yesterday, there were no noises, knocks or anything else. I did have the coolant system flushed and refilled in August but had no problems until today. The AC worked fine in the warmer weather. The weather has been moderate this fall (50+degrees) in my area, so heater was used minimally since august. Yesterday and today, temp fell into 30s, so heat was a must. Took to dealer…they say heater core is bad. Is that even possible on a 5 year old vehicle?

How long has your 2019 Honda Ridgeline had this problem?

2 days