1994 Lexus ES 300 Overheating!

Tiny
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
Tuesday, August 12th, 2014 AT 3:48 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 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
Tiny
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
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 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
Tiny
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
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 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.
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Tuesday, August 12th, 2014 AT 9:13 PM

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