1994 Lexus ES 300 Overheating!

MAGANAIVAN

MEMBER
1994 LEXUS ES 300
V6
AUTOMATIC
216,000 MILES

I have a 94 Lexus Es300 that over heats in about roughly 10 to 20 minutes. I've noticed my hydraulic fan dosen't run at all! I gave it a spin by hand see if it was free well it felt fine. I thought it was the pressure line house which runs from the power steering pump to the radiator. I replaced it nothing still. I replaced the the thermostat nothing either. Although when I took out the thermostat it had like trash on it. I flushed out my coolant truly enough it was dirty. Still nothing. My radiator starts right up when I turn the engine, but slowly comes to a stop and never runs again even if the temperature gets HOT! PLEASE HELP ME IT'S DRIVING ME NUTS

5 Replies

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Are the fans you are referring to electric and not hydraulic? Also, if you are at highway speed, does it over heat?

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Tuesday, August 12th, 2014 AT 4:18 PM

MAGANAIVAN

MEMBER
3 POSTS

@Jacobandnickolas My fan is hydraulic. I run it on the local streets for about 10 to 20 mins. The fan starts up but very slowly then starts to fade out, slowly until it comes to a complete stop never runs again even if the tempature is starting to rise.

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Tuesday, August 12th, 2014 AT 4:34 PM

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Most likely the coolant temp sensor is bad. Although the fan is hydraulic, it is actuated electrically.

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Tuesday, August 12th, 2014 AT 5:26 PM

MAGANAIVAN

MEMBER
3 POSTS

I forgot to add that I changed that also it looks like a bolt that goes underneath the radiater cap well near it. It didn't change anything either dude! I think it's the engine computer. What else could it be?

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Tuesday, August 12th, 2014 AT 5:35 PM

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Take a look at this:

file:///C:/Users/Joe/Downloads/94%20cooling. Pdf

There should also be a solenoid mounted on the side of the PS pump. The solenoid mounted on the steering pump controls how much hydraulic fluid gets to the fan motor. Check that too.