This is possibly more than you ever wanted to know in reference to the cooling system on your saturn.
First off the 95 and earlier 1.9 ltr engines did indeed have two temp sensors. One for the gauge and the other for the PCM. I have been told that you should not tap into the ECTS for the PCM wiring to feed your gauge. Hopefully Losone will explain it better than I. Something about impedance and screwing up the PCM. I am really just a pup when it comes to electricity!
That said you need to add another temp sensor. You can simply drill and tap the boss (flat spot) on the 97s cylinder head. This would be similar in location to the 95s gauge sensor. If you are not comfortable with that there are many other options. I have seen them JB welded to the head, tapped into the metal coolant line to the coolant tank, a metal tee in a heater hose and a few more that I won't mention.
My two favorite locations are the elbow that goes into the intake manifold or into the gooseneck for the top rad hose. Both make it simple to prevent metal shavings from entering the engine. I will e-mail photos as I can't for the life of me figure out how to include them in this post.
Do this first and see if your "overheating" continues. If So post back. There are several other things that can be checked.
[i:ea1eed4fa3]Some very Saturn specific info[/i:ea1eed4fa3]. The S-series cars are pretty much self burbing. There is a small line going back to the coolant tank above the upper rad hose connection at the motor. Its function is to purge air.
The excessive use of stop leak products is a bad idea. Especially on a Saturn as they have very small coolant passages and flow coolant through the heater core constantly. Plug up the heater core with excess stop leak and you'll get a car that won't purge air and that runs hot. At this point you will need to repeatedly flush the system.
I told you too much info.
Good luck and let us know. :)
Wednesday, May 17th, 2006 AT 7:03 PM