Well that sucks

[CheemsK1500]

Did you lose air co

So interesting take someone on Reddit has. They say it’s not Freon coming through the vents. They say my heater core is leaking and what I was seeing and smelling was engine coolant vapor coming through the vents.

That would explain the yellow liquid that dripped on the carpet from under the dash, and dripped on the ground below the passenger side door.

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Did you lose air conditioning function though? If you did not, then it is the heater core. If you did lose AC and find large amounts of engine coolant/antifreeze in the box, then that means you have possibly blown both a heater core and an evaporator core.

The heater core plays no part in the AC function, you can bypass it entirely and still have AC if your AC system is fully functional, in fact many do so on purpose during the summer months to avoid having the hot heater core air blend with the cold evaporator core air. You should go ahead get you a set of AC manifold gauges to verify the AC system is even charged; that alone will tell you if anything blown or has a major leak in the AC system specifically.

 

[Blackbird]

I won’t know until this weekend. As soon as the vapor appeared I turned the truck off and have not turned it back on since. I was afraid it would damage something. I’m headed out of town but will fiddle with it on Sunday.

 

[Sad Sack]

You would never see the refrigerant as a liquid - its only liquid under the high pressures generated by the compressor and immedialy flashes off to vapor when moved to a lower pressure environment (which is how the system works - gas starts as a liquid, then flashes off in the evaporator-absorbing heat in the process, then goes thru the compressor and turned back into liquid-releasing heat at the condensor). If you are actually finding liquid dripping out, a blown heater core starts to make sense.

Especially if the vapor smells "sweet" like "burnt" sugar.

 

[75gmck25]

The smell of antifreeze is very distinctive, and I assumed most folks would recognize it immediately. Nothing at all like you would smell from an A/C line refrigerant leak.