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I have a '93 del Sol Si with a JDM GSR swap. I noticed a subtle smell of coolant in the cab when driving. When I looked under the hood I saw a tiny spray of coolant coming from pin-hole in the small hose that attaches from the thermostat housing to the passenger side of the intake manifold (using a Skunk2 GSR IM) where it mounts to the head. I believe that it's called the thermostat bypass hose.
The bypass hose is the larger 5/8" L shaped hose in your photo. The smaller 5/16" coolant hose is part of the T/B and IACV de-icing circuit. This small port on the Skunk2 I/M just below the bypass fitting can be un-necessary in some applications, so you will have to examine what you have and how the circuit is run.
Confirm if this is the thermostat bypass hose
