1st Gen FTW - It's AutoMedic!
Join Date: Jun 2008
Location: Garrison, ND
If it's a first gen, and it has experienced over heat problems, it's probably a bad pressure bypass spring... I had purchsed the care after multiple overheats, rebuilt it all, and had to replace the spring (1 tenth of an inch under spec and felt weak), and also had to replace the pressure switch (it is, after all, a spring affected by heat).
stick a pressure gauge to it and see what the pressure is at idle. If it is fine, replace the switch and call it good. If it is low, pull the pan, remove the plug and spring, measure it and replace if needed. If it is good, tear down farther for other issues (main and rod bearings out of spec, oil pump out of spec, etc). If the spring was bad, replace with a new spring (shim it too if you like), and re-check with a gauge. If it's good, you're good to go... if it's bad, tear down is required anyways...