CATEngine Parts

171-8708 Coolant Flow Switch — Cat 3508 3516

This coolant flow switch monitors the engine's cooling system, activating an indicator or alarm when coolant flow is insufficient to prevent overheating. It is built to precise specifications, ensuring reliable operation unlike a faulty switch that may fail to trigger or give false readings. Operators may notice the engine overheating warning light illuminating unexpectedly, or conversely, the light failing to activate when the engine is actually running hot.

Coolant Flow Switch – Part No 171-8708 – CAT Spare Part
Part Specifications
BrandCAT
CategoryEngine Parts
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Installation & Application Notes

Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeCoolant Flow Switch
MaterialBrass, plastic
ApplicationEngine cooling system
Service LifeReplace every 3,000 hrs or as needed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A malfunctioning coolant flow switch may cause the engine overheat warning light to illuminate erratically or fail to activate when needed. If the switch fails to detect low flow, the engine can continue to operate under high-temperature conditions, leading to potential gasket failure or cylinder head warping. Ignoring a faulty flow switch risks severe engine damage due to undetected overheating.

Installation Tip

Ensure the engine cooling system is completely cool and depressurized before attempting to remove the old switch. Do not overtighten the new switch, as this can damage the threads in the engine block.

Service Note

When replacing the coolant flow switch, it is advisable to inspect the coolant level, thermostat, and water pump for proper operation.