No it is on top of motor.
The above is incorrect , I believe. It appears to be on the side of the engine attached to the water pump. But it is not on the top, as above stated( i just looked, and ruined a perectly good upper hose gasket.)
You have to take the intake manifold off in order to do this. Both sensors (there are 2 of them) are on top of the heads. A dealer will typically charge $1100-$1500 for this service because it is time intensive. The sensors themselves are around $170 each. I would recommend a top end rebuild to get more value out of the time/money spent on this procedure.
It could be a number of different problems. The first thing to do is go to an auto parts store that offers free power-train error code readings, the scanner may answer the question. If not, possible causes are: dirty radiator, bad coolant temperature sensor, bad thermostat, bad waterpump, bad cooling fan or cooling fan relay/fuse. Or it could be a blown head-gasket, which will make your oil light brown and foamy like chocolate milk or make your coolant recovery tank smell like exhaust fumes.
In the ES250 model, the fuses are located in 2 primary places. In the engine compartment, on the drivers side, along the top outside wall, in a black compartment. Just pop open the snap on hinge to gain access to these fuses. Secondly, inside the car, drivers side floor panel area. Remove panel door to access these fuses.
Often it's an alternator diode. Check the battery first. When batteries start to go bad they can often start to discharge over a couple hours. Take it to an auto parts retailer and have them test the battery and alternator for you. I had the same problem with my '92 Windom (ES 300). It was a faulty trunk mounted CD changer that was draining the battery.
Yes it does, I have a 1990 Lexus es250 and it had the 2.5 2vzfe and I swapped for a 2.0 1vzfe and it bolts right up swapped all the stuff of the old motor on to the new motor, I did however buy a seal kit timing kit water pump for the 1vzfe motor because some of the seals are only for the 1vzfe and will not work on the other, you get the point. I have 50k on this motor in my car and it works great.
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