cooling fans
- Thread starter JIMSHO
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projectSHO89
SHOless In St L
Before jumping to the conclusion that your cooling system is not working properly, get an accurate reading of the temperature of the engine during operation. The dash guage is notoriously inaccurate.
Temperature is sensed by the ECT. The computer turns the fans on and off using a relay in the CCRM/IRCM.
Steve
Temperature is sensed by the ECT. The computer turns the fans on and off using a relay in the CCRM/IRCM.
Steve
Off Road SHO
Moderator
What Steve said.
The ECT sensor reports back to the computer and is a two wire sensor that sits to the right of the thermostat housing.
The dash water temp gauge is informed by the single wire sending unit that is to the left of the thermostat housing.
Check for the actual temperature.
Tom
The ECT sensor reports back to the computer and is a two wire sensor that sits to the right of the thermostat housing.
The dash water temp gauge is informed by the single wire sending unit that is to the left of the thermostat housing.
Check for the actual temperature.
Tom
projectSHO89
SHOless In St L
Here is how it is SUPPOSED to work. This is quoted verbatim from the 94 Taurus service CD:
The cooling fan system is controlled during vehicle operation by the Constant Control Relay Module (CCRM) and Powertrain Control Module (PCM) 12A650 which will energize the radiator electric motor under the following conditions:
Radiator electric motor is turned on with reduced current for the 3.0L SHO and on at low speed for 3.0L, 3.2L SHO and 3.8L if:
a. Engine temperature is higher than normal. Radiator electric motor starts running at 102°C (215°F) and stops running at 99°C (210°F).
b. A/C clutch is engaged.
l Cooling fan will run at high speed if:
a. Engine temperature is higher than desirable and radiator electric motor has been operating at low speed. Radiator electric motor starts running at high speed at 110°C (230°F) and stops running at 107°C (224°F).
On 3.2L SHO engines, low speed radiator electric motor operation is achieved by using a dropping resistor in series with the motors.
The 3.0L/3.0L FF, 3.0L SHO and 3.8L use a dual winding radiator electric motor in which low speed fan control is achieved through the low fan control winding circuit (no dropping resistor).
The normal operation and cycling of the radiator electric motor causes the temperature gauge indicator to read between the mid-point and upper portion of the temperature gauge scale.
The slightly higher indicator reading returns to mid-point when radiator electric motor operation begins.
Additionally:
NOTE:
With A/C ON, the radiator electric motor will run continuously. The radiator electric motor will not cycle ON and OFF with the A/C clutch (2884).
NOTE:
An exception to this is when vehicle speed is over 72 km/h (45 mph) and coolant temperature is below 104°C (220°F). The radiator electric motor will then automatically shut off.
l The radiator electric motor is mounted within a fan shroud (8146) behind the radiator.
l The constant control relay module actuates the radiator electric motor when the coolant reaches a specified temperature, when the engine reaches a specified speed, or when the A/C clutch is activated, if equipped.
Steve
<small>[ November 19, 2003, 08:39 AM: Message edited by: projectSHO89 ]</small>
The cooling fan system is controlled during vehicle operation by the Constant Control Relay Module (CCRM) and Powertrain Control Module (PCM) 12A650 which will energize the radiator electric motor under the following conditions:
Radiator electric motor is turned on with reduced current for the 3.0L SHO and on at low speed for 3.0L, 3.2L SHO and 3.8L if:
a. Engine temperature is higher than normal. Radiator electric motor starts running at 102°C (215°F) and stops running at 99°C (210°F).
b. A/C clutch is engaged.
l Cooling fan will run at high speed if:
a. Engine temperature is higher than desirable and radiator electric motor has been operating at low speed. Radiator electric motor starts running at high speed at 110°C (230°F) and stops running at 107°C (224°F).
On 3.2L SHO engines, low speed radiator electric motor operation is achieved by using a dropping resistor in series with the motors.
The 3.0L/3.0L FF, 3.0L SHO and 3.8L use a dual winding radiator electric motor in which low speed fan control is achieved through the low fan control winding circuit (no dropping resistor).
The normal operation and cycling of the radiator electric motor causes the temperature gauge indicator to read between the mid-point and upper portion of the temperature gauge scale.
The slightly higher indicator reading returns to mid-point when radiator electric motor operation begins.
Additionally:
NOTE:
With A/C ON, the radiator electric motor will run continuously. The radiator electric motor will not cycle ON and OFF with the A/C clutch (2884).
NOTE:
An exception to this is when vehicle speed is over 72 km/h (45 mph) and coolant temperature is below 104°C (220°F). The radiator electric motor will then automatically shut off.
l The radiator electric motor is mounted within a fan shroud (8146) behind the radiator.
l The constant control relay module actuates the radiator electric motor when the coolant reaches a specified temperature, when the engine reaches a specified speed, or when the A/C clutch is activated, if equipped.
Steve
<small>[ November 19, 2003, 08:39 AM: Message edited by: projectSHO89 ]</small>
projectSHO89
SHOless In St L
Read ^^ (already answered twice).
Steve
Steve
Off Road SHO
Moderator
Jimsho
The relay (1) is in the Constant Control Relay Module (CCRM) which is under the plastic radiator warning label holder, the PRWLH. It's a sealed unit so you can't just replace one relay. It also houses your fuel pump relay.
The relays are always "hot" with 12 volts and ready to actuate. All they need is a ground to be sent from the Powertrain Control Module (PCM) also known as (AKA) the computer.
You can't easily change when the computer decides to send the relay actuating ground, but you can make sure that the computer is getting the correct engine coolant temperature reading by replacing the ECT sensor as described above.
HTH ( hope this helps )
Tom
A Charter Member of P.A.S.A.A. ( People Against Stupid Ass Acronyms )
I'm also a member of D.A.M. ( Mothers Against Dyslexia ) wink
<small>[ November 19, 2003, 06:39 PM: Message edited by: Off Road SHO ]</small>
The relay (1) is in the Constant Control Relay Module (CCRM) which is under the plastic radiator warning label holder, the PRWLH. It's a sealed unit so you can't just replace one relay. It also houses your fuel pump relay.
The relays are always "hot" with 12 volts and ready to actuate. All they need is a ground to be sent from the Powertrain Control Module (PCM) also known as (AKA) the computer.
You can't easily change when the computer decides to send the relay actuating ground, but you can make sure that the computer is getting the correct engine coolant temperature reading by replacing the ECT sensor as described above.
HTH ( hope this helps )
Tom
A Charter Member of P.A.S.A.A. ( People Against Stupid Ass Acronyms )
I'm also a member of D.A.M. ( Mothers Against Dyslexia ) wink
<small>[ November 19, 2003, 06:39 PM: Message edited by: Off Road SHO ]</small>
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