Hey Paul, the first thing you need to do is check all of your hose clamps and make sure they're tight. My 94 Spirit kept doing the gauge dance and I finally found a loose hose clamp on a heater hose! If you don't have any screw clamps that are loose, then you may have a leaking head gasket.hiway said:As for the trunk leak, when the weather warms up I'm going to get in the trunk, while someone sprays water on certain areas at a time. Have to see something, I'm determined to find the answer. I'll keep everyone posted.
As for the cooling system, I did pressure test it @ 16#. Very, Very slow leakdown, 8# in 10 min. So, you're right, there is some loss of pressure - therefore vacuum - on cooldown. Just before this, I put a new rad cap on from NAPA. ( had an S logo on it, Stant? ) But . . . the cap says "vented" on it. Since this is a closed system is that right cap?
Sorry for the wordiness,
That likely means it vents at pressure above a certain amount. There may be a pressure value stated on the cap. If the system over-pressurizes (say from a bad head gasket letting compression gases into the cooling system) the cap vents off excess pressure to maintain the cap's max pressure rating.Just before this, I put a new rad cap on from NAPA. ( had an S logo on it, Stant? ) But . . . the cap says "vented" on it. Since this is a closed system is that right cap?