Hi Everyone,
Last October, my coolant level was doing a disappearing act which stopped for no apparent reason, and I haven't given it too much thought since then. I did end up topping up with a bit less than a half gallon of distilled water. Now that it is starting to heat up (about 98° F today), I have noticed my 986 has being running a bit hot, closer to the 220° tick than the 180° tick.
When I parked today, I checked the coolant cap, and heard a hissing from that general area. I very carefully loosened the coolant cap 1/8 turn, which confirmed the hissing was coming from gas escaping from the coolant tank. A few minutes later I noticed some condensation on the trunk lid in the same area. My water pump has already been replaced, but not recently.
Any thoughts on what this may be, bad tank, bad cap, leak?
Thanks,
-Rick
Additional Info: Went out to check the radiator fan fuses (C8 & C10, which are fine), and noticed the interior of the car (and garage) was very humid. Looked around back, and some coolant (complete guess, but maybe 2 liters) had leaked out of the overflow above the rear passenger wheel. This is about 20-30 minutes after being shut off/parked.