SPAL Variable Temperature Control Sensor (165-185 Degree) for Brushless Fans

Low-Temperature Fan Activation for Performance Cooling Builds: SPLSBL-TSI-185P-PKG

The SPLSBL-TSI-185P-PKG is SPAL's variable temperature control sensor package calibrated for brushless fan activation between 165 and 185 degrees Fahrenheit. Threaded to 3/8 in. NPT, this sensor installs into a radiator or coolant passage port and connects directly to the SPAL brushless fan wiring harness, giving the fan controller an early, accurate trigger to keep coolant temperatures in check on performance builds, road race setups, and any application using a low-temperature thermostat. No relay, no external switch box, and no complex wiring is required.

Key Features

• Variable temperature activation range: 165 to 185 degrees Fahrenheit, the lowest available SPAL TSI range for aggressive thermal management
• 3/8 in. NPT thread for compatibility with standard radiator and manifold sensor ports
• Designed specifically for SPAL brushless fan systems, delivering the correct signal to the fan controller
• Plug-and-play installation into SPAL brushless fan wiring harness with no relay or additional switching hardware
• Adjustable activation threshold within the rated range to dial in fan engagement to your exact cooling target
• MSRP $224.19, part number SBL-TSI-185P-PKG

Specifications

What's Included

• 1x SPAL SBL-TSI-185P-PKG variable temperature control sensor (165 to 185 degree)
• Wiring harness adapter for SPAL brushless fan controller connection

About SPAL

SPAL Automotive is an Italian-engineered, globally recognized manufacturer of electric cooling fans, blower motors, and fan control systems. Founded in 1959, SPAL supplies OEM-level components to automotive manufacturers worldwide and is widely considered the benchmark for high-efficiency brushless cooling fan technology in both OEM and aftermarket applications. Their brushless fan systems are used across racing, motorsport, and performance street builds where consistent, reliable thermal management is non-negotiable.

Frequently Asked Questions

The SPLSBL-TSI-185P-PKG is designed for SPAL's Plus Series and other brushless cooling fans equipped with the TSI sensor harness input. Confirm your specific SPAL fan model's harness connector type before ordering to verify compatibility.

The SPLSBL-TSI-185P-PKG is the best choice when running a 160 degree thermostat, building a dedicated track car with aggressive cooling targets, or any setup where you want the fan to activate before coolant temperatures reach mid-range thresholds. It provides the earliest fan engagement of the three available SPAL TSI sensor ranges.

The sensor uses a 3/8 in. NPT thread, which is standard on most performance radiators, thermostat housings, and intake manifold coolant ports. If your installation point uses a different thread pitch, a standard NPT adapter bushing will allow this sensor to fit.

No. SPAL's brushless fan system manages all power switching internally through the fan controller. The SPLSBL-TSI-185P-PKG simply sends a calibrated temperature signal to the controller. No relay, no additional fuse, and no external switching hardware is needed beyond the SPAL brushless fan harness.

Yes, provided your cooling system is set up to operate in the 165 to 185 degree range. Most factory thermostats open at 195 degrees or higher, so this sensor is best suited to builds with upgraded lower-temperature thermostats or dedicated performance cooling systems. Installing this sensor on a stock cooling system without a matching thermostat may result in constant fan operation.

Yes, in multi-fan applications the sensor signal can be shared or split depending on the SPAL wiring harness configuration. Refer to the SPAL brushless fan wiring documentation for your specific fan models to determine whether one sensor can trigger multiple controllers simultaneously.

All three packages are functionally identical in construction, differing only in their calibrated activation ranges. The 185P-PKG (165 to 185 degree) engages earliest, the 195P-PKG (175 to 195 degree) is mid-range, and the 215P-PKG (190 to 215 degree) engages latest. Choose based on your thermostat temperature rating and preferred coolant operating window.

The UPC for the SPLSBL-TSI-185P-PKG is 816211022614. The SPAL manufacturer part number is SBL-TSI-185P-PKG.

Installation Instructions

1. Locate a 3/8 in. NPT threaded port on the radiator side tank, thermostat housing, or coolant outlet passage.
2. Remove any existing plug or sensor from the port and clean the threads.
3. Apply thread sealant or PTFE tape to the SPLSBL-TSI-185P-PKG sensor threads.
4. Thread the sensor into the port by hand, then torque carefully, avoiding overtightening in aluminum housings.
5. Connect the sensor pigtail to the SPAL brushless fan controller harness input.
6. Start the vehicle and allow coolant to reach operating temperature, confirming fan engagement occurs within the 165 to 185 degree activation window using a scan tool or temperature gauge.
7. Inspect the sensor port for coolant leaks at full operating temperature before returning the vehicle to service.

WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.