o1bizzy1o

wow great information thanks. i will give this a shot. anyhow today i brought the lexus into the shop that im taking classes for to get my certificate. we hooked up the diagnostics and found out that the engine is running at perfect temperature. which led us to believe that the problem is within the gauge. we disconnected the temperature sensor and found out that the needle would not drop to c but one bar above... meanin gthat the gauge some how jumped a notch and reads inaccurate.. solution- replace temperature gauge? any how the fans still dont kick on when ac is turned on. and i will have to trouble shoot the fan issue now with the information provided by obergc above. thanks your the man.

ok one of my buddies asked me to fix his car. the problem is its overheating and the two fans infront of the radiator do not come on. first thing i did was make sure that there was no air in the system... check then i took off the thermostat and it looked pretty corroded and tore up so i took that out but it was too late to get a new one so one will put replaced tomorrow. i then disconnected the fans and checked for power... theres power going to it but the fans do not come on after idling for quite a while but i do notice that it will go on when the engine first starts but that only lasts for 3 seconds and it wont come on after that. i am thinking that the coolant temperature switch is faulty causing the fans not to kick on... but then again even when the ac is turned on the fans wont go on either... after searching the forum and google i couldn't come up with any temperature sensors for the ls400. fresh out of ideas please help.