coolant smell in cab

[Cheekster96]

Howdy everyone, hope you all are having a good weekend so far.

 

I have a '15 All Terrain with the 5.3L.  Recently I have been smelling coolant in the cab; is especially bad after sitting all night and doing the first start up in the morning.  No apparent leaks.  Nothing wet on my garage floors.  Coolant level seems normal in the expansion tank.  No white smoke (or any colored smoke for that matter) coming from the tail pipe at start up or warmed up temps.  I cannot say for sure it if is worse if I turn on the ventilation system, as the smell is already pretty apparent in the cab.

 

Any ideas or areas to check?  I was going to look in the area where the cabin filter is at and see if there is anything damp up in that area.  I am thinking heater core maybe?  I will do some more digging around under the hood.  Try to get a good light and check the heads to block and see if I can see any seepage anywhere.

 

If I find something, I ll post it.

 

Lee