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Peterbilt Kit-Solenoid Service, Push to Connect | 5602-01-020
Brand:
Paccar
SKU:
5602-01-020
Price:
$73.50
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Fans & Fan Clutches For Peterbilt Trucks
The engine cooling fan and fan clutch work together to draw air through the radiator and charge air cooler when engine coolant temperature rises above the thermostat's activation point. A properly functioning viscous or electronically controlled fan clutch engages on demand and disengages at speed when ram air is sufficient — reducing parasitic drag and improving fuel economy. A seized fan clutch that runs continuously robs the engine of power and raises cab noise; one that won't engage causes overheating. We carry fans, fan clutches, and related hardware for Peterbilt trucks.
Frequently asked questions about fans & fan clutches
How do I test a fan clutch on a Peterbilt?
With the engine cold and off, attempt to spin the fan blade by hand — it should have some resistance but spin freely with moderate effort. A fan that spins with zero resistance on a viscous clutch is likely failed in the disengaged position. With the engine warm and at operating temperature, a properly functioning clutch should engage audibly when coolant temp rises. An electronic fan clutch can be commanded on and off using a diagnostic tool to verify solenoid and clutch function.
What's the difference between a viscous fan clutch and an electronic fan clutch?
A viscous fan clutch uses a silicone fluid chamber and a bimetallic coil to engage based on air temperature passing through the radiator — it's a passive, self-regulating system. An electronic fan clutch receives a signal from the engine ECM based on coolant temperature, AC demand, engine load, and vehicle speed, allowing more precise control and better fuel economy optimization. Most current-generation Peterbilt trucks with PACCAR MX engines use electronically controlled fan clutches.
Can a bad fan clutch cause the AC to underperform?
Yes. The condenser sits in front of the radiator and relies on the same airflow for heat rejection. If the fan clutch fails to engage at low vehicle speeds or in stop-and-go conditions, condenser pressure builds, AC cooling capacity drops, and the high-pressure cutout switch may trip. A fan clutch that seems adequate for engine cooling may still cause AC performance complaints at idle or in heavy traffic where ram air is insufficient.