[DeTomaso] Radiator Fans Running Constantly

[sobill at aol.com]

What you say is correct if neither of the two sensor terminals is grounded. One terminal on the sensor is connected to the radiator structure which may, or may not, provide a good ground connection and the other terminal closes to the first terminal when the temperature set point is reached. For the grounding of the sensor to not be dependent on the radiator structure, a ground wire is provided for each relay as well as the wire from the low side of the fan relay coil. However, IF the radiator structure is grounded and the wire from the low side of the fan relay is connected to the grounded terminal on the sensor, the fans will run at all times. I learned this by connecting my fan wires the wrong way around when I installed my newly rebuilt radiator. To fix this problem, swap the two wires at the sensor.


SOBill


-----Original Message-----
From: Tom Shinrock <tmshinro at aol.com>
To: detomaso <detomaso at poca.com>
Sent: Thu, Apr 10, 2014 10:18 am
Subject: Re: [DeTomaso] Radiator Fans Running Constantly


   Bill,
   I'm electrically impaired.  If the switches are just completing a
   ground circuit, why would it make a difference on which way the wires
   are connected?
   Hoping to learn something new today.
   Tom
   5186

   -----Original Message-----
   From: sobill <sobill at aol.com>
   To: reillyms <reillyms at live.com>; detomaso <detomaso at poca.com>
   Sent: Thu, Apr 10, 2014 9:06 am
   Subject: Re: [DeTomaso] Radiator Fans Running Constantly
   If the fan relay wires are connected to the temperature sensor
   terminals the wrong way around, the fans will run continuously.

   SOBill

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-------------- next part --------------
   What you say is correct if neither of the two sensor terminals is
   grounded. One terminal on the sensor is connected to the radiator
   structure which may, or may not, provide a good ground connection and
   the other terminal closes to the first terminal when the temperature
   set point is reached. For the grounding of the sensor to not be
   dependent on the radiator structure, a ground wire is provided for each
   relay as well as the wire from the low side of the fan relay coil.
   However, IF the radiator structure is grounded and the wire from the
   low side of the fan relay is connected to the grounded terminal on the
   sensor, the fans will run at all times. I learned this by connecting my
   fan wires the wrong way around when I installed my newly rebuilt
   radiator. To fix this problem, swap the two wires at the sensor.

   SOBill
   -----Original Message-----
   From: Tom Shinrock <tmshinro at aol.com>
   To: detomaso <detomaso at poca.com>
   Sent: Thu, Apr 10, 2014 10:18 am
   Subject: Re: [DeTomaso] Radiator Fans Running Constantly
   Bill,
   I'm electrically impaired.  If the switches are just completing a
   ground circuit, why would it make a difference on which way the wires
   are connected?
   Hoping to learn something new today.
   Tom
   5186

   -----Original Message-----
   From: sobill <[1]sobill at aol.com>
   To: reillyms <[2]reillyms at live.com>; detomaso <[3]detomaso at poca.com>
   Sent: Thu, Apr 10, 2014 9:06 am
   Subject: Re: [DeTomaso] Radiator Fans Running Constantly
   If the fan relay wires are connected to the temperature sensor
   terminals the wrong way around, the fans will run continuously.

   SOBill

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   2. [7]http://poca.com/mailman/listinfo/detomaso_poca.com

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