Question about 1999 Toyota RAV4

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1999 rav4 radiator fans not engaging. do both fans come on together or do they have separate sensors? also, do they both run on a single fuse?

Thermostat and anti-freeze has been changed. ran the motor for 5 minutes and neither fan came on. the temp gauge was still at normal temp but im pretty sure at least one fan would come on within 3 minutes of starting the engine. the car began overheating on my daughter and immediately pulled over and called me. to get it home, i topped off the fluid, bypassed the sensors and ran one fan directly off the battery. she said a friend said the thermostat was bad a few months earlier so i changed it. but i dont think he realized the fans werent working. my daughter travels only very short distances so it never really gave her problems.

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: overheating

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Posted on Jun 19, 2008

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SOURCE: 1990 toyota corolla wagon 1.6 liter 5 spd. overheating

you've got a possible blockage in the head or block.

Posted on Oct 03, 2009

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SOURCE: 1993 Toyota Camry V6: Engine Overheating Prob

Yes if it hydraulically operated it could be because the pump for the fan is bad. If I am not mistaken the fan is run off of the power steering pump correct. check and make sure the pump is working correctly. I have not seen a hydraulic motor on a car I know they put them on a lot of diesel trucks like humvees and some Chevy diesels but not on a car. Most are usually electrical. I know on humvees with a hydraulic fan they have a fan controller check this and make sure it is working right you can unplug the controller and the fan should stay ingaged and turn faster.

Posted on Oct 05, 2009

ajsgolfer
  • 1 Answer

SOURCE: 1993 Toyota Camry V6: Coolant Overheating Problem.

how do u change the water pump in a 1993 toyota camry v6 engine?

Posted on Dec 25, 2009

acoates
  • 454 Answers

SOURCE: 1994 4Runner, 3.0 v6 overheating; new

Hello, jimmy_grant1 and thank you for asking your question on Fixya!

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your
1994 Toyota 4Runner, without even using any tools. It has helped millions of people, and I am certain that it will help you, because I wrote it for people in your exact situation.
How to diagnose an overheating
1994 Toyota 4Runner
Pay attention to the block test part of the instructions.

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Posted on Jan 13, 2011

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There is no radiator fan sensor, the fan is controlled on and off from the cars ECM (computer) which takes the reading from the engine's temperature sensor. If you think you have radiator fan issues, check your fuses under the hood and the relay fan to your radiator, once you have determined that there in good working order, move on to inspecting for a bad wire harness to the radiator fan but take caution to the fan turning on hot engine parts if your going to have the engine running.
Turning on the A/C with the engine running should also turn the fans o, if they don't come on then inspect your fuses as mentioned above and relays.
Thank you for using fixya and be safe.

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My Caravan radiator fans run constantly and the temp gage never moves off "cold". The engine is not overheating. I have replaced the temp sensor and the thermostat. No change.


The temperature sensor may be controlling the fan via a relay; these can fail by welding the contacts together remaining permanently 'on.'
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Are the radiator fans on the 1999 RAV4 controlled by a fuse? The fans on my vehicle stopped spinning leading to overheat conditions.


The fans are controlled by a temp gauge, the PCM, the relays and are fused. Start with the easiest the fuse and then go towards the relays. Try jumping past teh relays to see if they run. The PCM tells the fans to go on but if the fuse is popped or the relay is bad they'll never go on.

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Overheats on hwy. Radiator fan does not engage after overheating


fan does not generally come on till you reach about 210f. second fay comes on when ac compressor is on. Allowing for gauge inaccuracy this does not sound like a problem. Have you checked for coolant loss inside or outside the engine? If coolant is low, it may not be reaching the sensor unless you make pump run faster. Those engines are known for head and intake gasket problems, which may be the underlying cause of what you described. A partilally obstructed radiator can give some of the symptoms but I don't thind that is it.

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