Jetta Sedan V6-2.8L (BDF) (2003)
Condenser Fan: Description and Operation
Coolant Fan Control
The Coolant Fans (V7/V35) are primarily controlled by the following:
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Coolant Fan Control (FC) Thermal Switch F18
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Coolant Fan Control (FC) Control Module J293
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A/C Pressure Switch F129 (via J293), if equipped
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High Pressure Sensor G65 (via J293), if equipped
When A/C is off:
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F18 switches the fans on to first speed when coolant temperature is within first stage switching temperature range.
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F18 switches the fans on to second speed (via J293) when coolant temperature is within second stage switching temperature range.
When A/C is on:
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J293 switches the fans on to first speed.
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If equipped, A/C Pressure Switch F129 switches the fan(s) to the second speed (via J293) when refrigerant circuit pressure increases.
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If equipped with High Pressure Sensor G65, J293 switches the fan(s) to the second speed if the refrigerant system pressure rises.
Coolant Fan Control (FC) Thermal Switch F18
Switching temperatures:
1st stage
On: 92 - 97 °C
Off: 84 - 91 °C
2nd stage
On: 99 - 105 °C
Off: 91 - 98 °C
Coolant FC (Fan Control) Control Module J293
Note: Available in different construction styles, some separate some installed on radiator fan.
This control module switches on and off the A/C clutch and therefore the A/C compressor. It switches the coolant fan and calculates the pressure in the
refrigerant circuit on vehicles with High Pressure Sensor G65 or A/C Pressure/temperature Sensor G395.
A/C Pressure Switch F129