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Engines fans run all the time

Tiny
TWW1098
  • MEMBER
  • 1998 TOYOTA CAMRY
Cooling fans run all the time, Removed relays, fans stop, checked what I thought was temp sensor, was closed but fans still run, probably temp gauge, what turns fans on? Sensor? Location?
Thursday, August 28th, 2014 AT 1:55 PM

8 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 POSTS
Hi:
The cooling fans are powered by the PCM. A temp sensor sends a signal to the PCM indicating coolant temp. Once a certain temp is reached, the PCM sends a signal through the fan relay which then sends power to the fans.

I need to know what size engine this vehicle has to provide sensor locations.
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Thursday, August 28th, 2014 AT 7:38 PM
Tiny
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2.2 litre 4 Cylinder, 1998 Camry LE
The A/C is unplugged also, the condenser coil took a hit and I have not replaced it, would this also cause the fans to run constantly?
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Friday, August 29th, 2014 AT 4:06 AM
Tiny
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  • MECHANIC
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I don't feel that would cause them to stay on. As far as the sensor, it should be located on the top rear of the engine. See the pic attached.
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Friday, August 29th, 2014 AT 7:14 PM
Tiny
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I pulled the sensor from the a/c out of the line to the condenser and plugged it in and they stopped running, Whys that? Is it a pressure sensor? There no freon in the system. Matter a fact the system has no condenser.
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Saturday, August 30th, 2014 AT 3:24 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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What sensor are you referring to?
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Saturday, August 30th, 2014 AT 7:16 PM
Tiny
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It would normally be located in front of the Air conditioning condenser, out front of the radiator, threads into the actual a/c line, I think they're aluminum. Near a beer can sized drier, almost the size of a spark plug.
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Sunday, August 31st, 2014 AT 4:13 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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I think you are looking at the pressure switch.
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Monday, September 1st, 2014 AT 7:50 PM
Tiny
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Thank You for all your help.
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Tuesday, September 2nd, 2014 AT 4:06 AM

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