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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 itenter image description hereenter image description here

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?

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    Welcome to Motor Vehicle Maintenance & Repair! Honda uses blue coolant in their vehicles. Considering the year/mileage of the vehicle, I'd bet it's never been changed. It definitely warrants checking into thoroughly, but I doubt its coolant ... at least not coolant from your car. – Pᴀᴜʟsᴛᴇʀ2 Jul 30 '18 at 16:30
  • Coolant has a pretty distinctive sweet smell. Possible pollen from overhanging trees from where the car is parked? – zipzit Jul 30 '18 at 17:44
  • Is the AC working ok? Green fluid sounds like UV-dyed PAG refrigerant lubricant to me. – Al_ Jul 30 '18 at 20:52
  • Honda said they could not find source. I have pic. – Njg Jul 31 '18 at 16:20
  • Jiffy lube thought it was PAG fluid. Honda says no – Njg Jul 31 '18 at 16:41

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