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Anonymous Posted on Apr 09, 2017

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.

5 Related Answers

Anonymous

  • 1 Answer
  • Posted on Jun 19, 2008

SOURCE: overheating

eu quero comprar este carro quero saber o q faço pra comprar eu não falo ingles meu e-mail:[email protected]

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Anonymous

  • 75 Answers
  • Posted on Oct 03, 2009

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

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

Anonymous

  • 713 Answers
  • Posted on Oct 05, 2009

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.

Anonymous

  • 1 Answer
  • Posted on Dec 25, 2009

SOURCE: 1993 Toyota Camry V6: Coolant Overheating Problem.

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

Anonymous

  • 454 Answers
  • Posted on Jan 13, 2011

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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Thanks for the vote, and good luck!

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Related Questions:

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2answers

Electric fan will not run its overheating ?

I would think the problem is the water temp sensor on the radiator. Disconnect wires from sensor and join them together. Turn ignition on and the fan should run constantly. If it don't run check fuse and if fuse is good then the fan will be at fault.
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Temperature guage not working and engine overheated when stopped in trafic

The powertrain computer turns the fans on through the cooling fan relays, based on information from the coolant temperature sensor. The fans will only come on when the coolant temp. is pretty high-varies by manufacturer, but it is over 200 degrees, some as much as 230 degrees. So the fans will not come on when engine is started, but they should come on before the engine overheats. You should have them checked. Also find out if the temp. gauge sending unit is separate and different from the coolant temperature sensor-on most cars, they are separate, maybe not on yours?
Free advice from a shadetree-not worth a lot, eh? lol.
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1999 Dodge Neon Issues (HELP)

Here's a link to the P0340 code,and P1491.Powertrain Diagnostics Manual P-1491 Radiator Fan control relay circuit
Set condition: An open or shorted condition is detected in the radiator fan relay control circuit.

Possibilities:
Fan relay ground circuit open
Fused B+ circuit open
Rad fan control relay defective
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RF relay control circuit open
RF relay ctrl rly ckt wir harness observable or intermittant defect
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Defective PCM

Get out your Multimeter.
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99 ford escort running hot . i replaced the thermostat. flushed the radiator . had the synsors checked . no leaks no noice. is it my radiator?

You may need your radiator rodded and cored. But, before you do that check the relay that controls when your electric fan engages to pull air through your radiator. The sensors that control the electric fan are usually in the side tanks on the radiator. This sensor heats up and tells the fan when it needs to make the electrical connection to engage the fan to cool the radiator coolant. I would probably bet that is what is malfunctioning. They are a relatively inexpensive part. Good luck.
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Where is the radiator fan sensor on a 1999 toyota cturcel?

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.'
Locate the fuse (and possibly relay) box, check inside the cover for a layout that identifies which fuse or relay controls the fan; they are often on their own fuse and definitely on their own relay.
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Radiator fan will not kick on 1999 voyager flex fuel ,i already replaced coolant sensor

Check you replaced the correct fan control sensor switch (not the temperature gauge sender),
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Check fan will run if power applied directly to it.
0helpful
2answers

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.
0helpful
1answer

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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