1998 Toyota Corolla Fan Switch

Tiny
MKULINA
  • MEMBER
  • 1998 TOYOTA COROLLA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 110,000 MILES
The car is running hot in low speed situations. I replaced the left side cooling fan motor, which was dead. I also replaced the thermostat and the coolant temperature switch in the thermostat housing. It is still running hot, and I am thinking there must be a separate fan switch somewhere, but I can't seem to find it. Do you know if there is one? And where it is located?

Thank you. Mike
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Monday, August 23rd, 2010 AT 11:04 AM

9 Replies

Tiny
WRENCHTECH
  • EXPERT
The sensor is located in the left side of the engine, below the exhaust manifold.


http://www.2carpros.com/forum/automotive_pictures/561653_Cooling_fan_sensor_98_Corolla_1.jpg

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Monday, August 23rd, 2010 AT 11:23 AM
Tiny
MKULINA
  • MEMBER
I know, it looks just like an header, and it fooled me at first, but it was hooked to the air cleaner!

So it's in the front side of the engine. On the block or cylinder head?

And thank you. I really appreciate your help.

Do I have to tell you, this is the daughter's college car and she left yesterday?

Mike
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Monday, August 23rd, 2010 AT 11:28 AM
Tiny
WRENCHTECH
  • EXPERT
It looks like it's in the block. It should be pretty obvious.
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Monday, August 23rd, 2010 AT 11:59 AM
Tiny
MKULINA
  • MEMBER
I'm going to check, the longer I look at it, the more it looks like the temperature sensor which is located in the back of the thermostat housing. If it is, I have replaced that.

But I have not replaced the cooling fan relay and that may also be an issue.

It hard to diagnose on a car that keeps disappearing from the driveway.

Thank you. Mike
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Monday, August 23rd, 2010 AT 12:06 PM
Tiny
WRENCHTECH
  • EXPERT
Throwing parts at it is not the solution. It needs to be troubleshooted systematically from a wiring diagram.
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Monday, August 23rd, 2010 AT 12:15 PM
Tiny
MKULINA
  • MEMBER
You are right, I have been trying to eliminate the issue by working through waht I thought was the proper sequence. That sensor is the one in the thermostat housing and evidently it supplied the ECM with infor as well as controlling the fans.

The fan motor was worn enough to where it was brushing the radiator fins, so that haad to be fixed. I'm just not sure what the next step should be.

I broke down and bought an alldata subscription for it and will continue from there.

Thanks. Mike
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Monday, August 23rd, 2010 AT 12:25 PM
Tiny
WRENCHTECH
  • EXPERT
Follow the wiring diagram. Post back if you need something on the diagram explained.
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Monday, August 23rd, 2010 AT 12:41 PM
Tiny
MKULINA
  • MEMBER
I'll give that a try. And I'll let you know how it goes. Mike
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Monday, August 23rd, 2010 AT 12:44 PM
Tiny
PAULRONCO
  • MEMBER
What did you discover? I am trying to diagnose a similar issue on a 1995 Corolla.
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Sunday, October 7th, 2012 AT 9:49 PM

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