During a routine oil change they found green fluid on the cabin air filter. We took it to Honda dealership and they looked at it and said they’ve never seen anything like that and felt it was nothing. My husband is going back there because I said it’s just not normal and the people who did the oil change set it look like coolant.What do you think it could be? The Honda Accord is a 2016 with 12,000 miles on it
Honda said they could not find source. I have pic. Jiffy lube said it was green. Honda thinks it was blue and dried a blue green color. I am concerned because the car warranty is up in Feb but we only have 12k miles . Does the Honda diagnostic system test the heater core?