While it is certainly possible (likely even) that you are experiencing
another UIM failure, I personally always recommend that you eliminate other
possible coolant loss areas first.
To do that bring your car up to temperature so that the water pump comes on
and the system pressurizes. Then carefully review all hoses and water
connections for leaks. Sometimes hoses will only leak through a pinhole
while under pressure.
Then if you've found no leaks in hoses or connections, you move on to the
UIM. I do recommend the APN (I believe that'* the name) aftermarket UIM
kit. This kit takes into account all the things we have learned about why
the UIM fails and how to best avoid future failures. Plus the price is
I also recommend replacement of the LIM gaskets, especially if they've never
been replaced before. Even if they have, unless they were replaced with the
new aluminum framed style that just came out in 2005, they could probably
stand to be replaced again. You're in there already... ; )
Use the write-ups in TECHINFO for instructions. Once you do these, you
should be good to go!
Mike: 1997 SE w/ 183K, aka White Horse
, Gutted Airbox w/K&N, drilled 180* t-stat, tint all around, clear corners w/SilverStars, "PONTIAC" light up tail, PEMs, NGK TR55s