September 30: LEMON manuals is back up on a temporary server! Slowness is possible
Section 15 (Thermostat)
WARNING: This page is about a different car, the 2000 Lexus GS 300, 1999 Lexus GS 300, and 1998 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.