Doesn't appear to be a substantial amount. If the cap is old the coolant might/could be migrating into the reservoir. Easiest way to check that is a bit of hose and an empty soda bottle.
If you dont drive the car simply disconnect the stock reservoir from the radiator neck and run a hose to your soda bottle. I ran the hose straight down with the bottle on the ground. I used a drill to make a hole on the cap, nothing fancy. If the factory reservoir is vented do so to the bottle. If the hose runs all the way into the reservoir, do so with the bottle.
The only other outlet in the cooling system is the weep hole for the water pump. Hope this helps you diagnose this issue.
Bookmarks