Question about Lexus ES 300

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1994 lexus ES300- 3.0 Engine, is running hot while sitting still.Things I've done & replaced: new thermostat,used fan,cleaned radiator.

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  • duckman24 Jul 27, 2010

    thank you ill see, let u know

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How was this radiator cleaned? The only way to really clean a radiator is to get the end pans off, which on an aluminium radiator such as yours is nigh on impossible to get it sealed properly again. Did you flush the engine as well? Get the thermostat out(again) leaving the housing open. Both radiator hoses disconnected. Stick a hosepipe in there and let rip. Run the water till clear. Now stick the hosepipe in the other opening and repeat. Do this until there's no mre shale and rusty water exiting the engine.
Now : Do the fans start when the engine is idling(and hot) and the vehicle stationary? If not. Make sure the fan is working. You can do this by connecting 2 wires straight from the battery + and - to the fan(Dont worry about which way round. This is a DC motor. It will just turn in the wrong direction with polarity reversed). If not, replace fan.(again, yes I saw you'd replaced it already, bummer) If it works proceed to the next step.
Locate the fan thermo switch. It sits low down on the radiator on the end pan. Looks like a large brass(sometimes aluminium) nut with 2 wires connected to it. If you short out(connect to each other) these 2 wires(ignition on) the fan should come on. If not, replace the thermo switch. If after replacement the fans still do not come on(engine hot, vehicle stationary) the wiring may be faulty. Run a wire from battery + to one tab on the thermo switch. Another wire from the other tab on the thermo switch to the fan and yet another from the fan to the battery - or other suitable earth point on the bodywork of the car. To be safe wire a 15A fuse between the battery and thermo switch. Solved? No ? Move on
Remove the thermostat altogether. Solved? Yes? Thermostat is faulty. Replace(Again) No?Move on.
Replace your radiator. It is still clogged. You may try to flush it again but once pieces of shale have lodged themselves in the little pipes in the radiator theyre there for good.

Posted on Jul 27, 2010

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