Every time I pull into my garage I get a slight smell of coolant odor. Levels aren't dropping , car is running normal, and no visible signs of a leak.

Yesterday, while washing my car, I decided to hose the lining of the hood (bonnet) of my car.
Much to my surprise, there was quite a bit of orange coolant residue embedded into the lining. I was shocked how much orange came flowing out. It took a good bath to completely flush out the coolant.
I suspect that the smell was reproduced every time the engine was hot to heat the liner.

A few months ago, I blew a small hose, and it splashed onto the liner.

Last night after a 4 hour ride in 92 degree heat, I was happy to poke my nose under the hood, without a single trace of coolant smell.

 

My thermostat tower is cracked and spraying and I have been filling the tank with straight water (so I've been steam cleaning the sprayed coolant out of the hood pad until I get it fixed).

I'll have to check this when I dive under the hood tomorrow.