Temp Sender 400deg.

The VDO 323-050 Temperature Sender 400deg is a precision electric temperature switch engineered for heavy-duty engine cooling system monitoring. This 1/8-inch NPT male threaded unit activates at 400 degrees Fahrenheit, making it ideal for applications requiring high-temperature cutoff protection in vehicles, equipment, and industrial machinery where accurate thermal management is critical to operational safety and engine longevity.

The 400-degree activation threshold is calibrated for late-model cooling systems where traditional lower-temperature switches cannot provide adequate protection without triggering nuisance alerts. The NPT male connection ensures secure, leak-free installation into factory boss locations on engine blocks and radiator housings. VDO temperature senders are engineered to OEM specifications, delivering reliable electrical switching that integrates seamlessly with engine management systems, auxiliary fan relays, and warning lamp circuits. The compact form factor and minimal weight make installation straightforward without requiring extensive modification or aftermarket adapter fittings.

Users restoring or repairing cooling systems, upgrading to higher-capacity radiators, or modifying engine bay layouts benefit from having precise OEM-quality temperature sensing at elevated thresholds. Technicians and engine builders rely on VDO switching accuracy to prevent coolant boil-over in high-performance or heavy-load scenarios. This sender is particularly valuable in applications where engine temperatures consistently approach or exceed standard thresholds—off-road vehicles, towing operations, or performance tuning—where auxiliary cooling activation becomes essential to protecting the engine.