Dvinhie

I was driving on the road yesterday and smoke came out on the radiator cap. I had changed the themostat and the switch on the right side near the thermostat house. Yet the fan is still not turning on. I also pulled out the relay and that does not seem to be the problem. 1997 lexus es300

mitmaks

Check the actual fan motor to see if it's not burnt out.

310V6

When you where overheating, what did the temperature gauge say?

Dvinhie

The car temperature alway stay in the middle for some reason. The fan had been changed a month ago since the fan shroud broke off.

Dvinhie

I brought the car a couple month ago. I notice the fan were running nonstop because someone replace the radiator but didn't install in the ect switch on the bottom so i went to the junkyard and brought the wire and the ect switch. When i plug in it finally turn off but the issue is i waited for 30 minute the fan never came on to the point i can see smoke coming out the radiator cap.

310V6

Bad switch? Was is a used switch? I have testing procedures if you need them.

Dvinhie

i got the testing procedure i think and i believe i already test all of it. I'm just wondering what can be wrong with it since the relay/thermostat/ect switch are all working fine...
i don't know if im going to far with this but is there any chance water pump or power steering have anything to do with it?

310V6

So if you unplug the ECTS the fans turn on?

Dvinhie

Yes if i unplug the bottom ect switch wire then the fan will be running nonstop.

310V6

Gotta recheck that switch man. Like you mentioned earlier, maybe the pump isn't pumping.

mitmaks

Check that switch, it has to actually "switch" at certain temp.

Dvinhie

Which switch ? There like four switch. On left side there two more switch is there something to do with that? I research it could be the steering pump connector? Where would that harness be?