Notes On Intermittents
WARNING: This page is about a different car, the 1988 Cadillac Seville and 1988 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.
If an intermittent code EO65 is stored, manipulate coolant sensor wiring while observing ECM data ED04 (coolant temperature). If parameter jumps to a high reading (greater than 126°C), repair fault in wiring or connections.