--- product_id: 10784373 title: "Flex-A-Lite Variable Speed Controller and Relay Kit with Thread-In Temperature Sensor, Fan Controller With Temperature Probe (31163), Black" brand: "flex-a-lite" price: "NT$14853" currency: TWD in_stock: true reviews_count: 12 category: "Flex A Lite" url: https://www.desertcart.tw/products/10784373-flex-a-lite-variable-speed-controller-and-relay-kit-thread store_origin: TW region: Taiwan --- # 45A max amp rating 25s post-shutdown fan run 160-240°F temp range Flex-A-Lite Variable Speed Controller and Relay Kit with Thread-In Temperature Sensor, Fan Controller With Temperature Probe (31163), Black **Brand:** flex-a-lite **Price:** NT$14853 **Availability:** ✅ In Stock ## Summary > 🌬️ Keep your engine chill and your ride cool — smart cooling, no compromises! ## Quick Answers - **What is this?** Flex-A-Lite Variable Speed Controller and Relay Kit with Thread-In Temperature Sensor, Fan Controller With Temperature Probe (31163), Black by flex-a-lite - **How much does it cost?** NT$14853 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/10784373-flex-a-lite-variable-speed-controller-and-relay-kit-thread) ## Best For - flex-a-lite enthusiasts ## Why This Product - Trusted flex-a-lite brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built-In Relay Power:** Integrated relay eliminates need for external components, simplifying installation - • **Soft Start Fan Activation:** Fans start at 60% power, reducing electrical load and extending fan life - • **Universal Threaded Sensor:** Includes 1/4-inch NPT probe with 3/8 and 1/2-inch adapters for versatile mounting - • **Precision Temperature Control:** Adjustable 160-240°F activation range for tailored cooling performance - • **Extended Cooling After Shutdown:** Runs fans up to 25 seconds post-engine off to dissipate residual heat ## Overview The Flex-A-Lite Variable Speed Controller (Model 31163) is a high-performance automotive fan controller designed for dual-fan systems. Featuring an adjustable temperature activation range of 160-240°F and a built-in 45-amp relay, it ensures efficient, reliable cooling by starting fans at 60% power and ramping up as needed. The included threaded temperature sensor with multiple adapters offers flexible installation options. Its smart design runs fans for up to 25 seconds after shutdown to prevent overheating, making it an essential upgrade for millennial professionals who demand precision, durability, and hassle-free installation in their vehicle cooling systems. ## Description The Flex-A-Lite Variable Speed Controller is an electric fan controller for automotive dual-fan systems. It features an adjustable activation temperature range of approximately 160-240°F and provides relay function that eliminates the need for external relays. The cooling fan control module starts fans at 60% power, reducing startup amperage and increasing fan speed to 100% as the engine coolant temperature increases. It also runs fans for up to 25 seconds after the vehicle is turned off to remove excess heat from the radiator. The controller comes with a thread-in temperature sensor, a max amp inline fuse, wiring and electrical terminals for most common applications using an electric radiator cooling fan or engine cooling fan. It also includes a 1/4-inch NPT threaded temperature probe with 3/8-inch and 1/2-inch thread adapters. With a 45-amp rating and compatibility with 12-volt systems, these car parts are a reliable and efficient option for controlling engine cooling fans. The auto parts fan controller comes with a one-year manufacturer warranty, providing peace of mind for car enthusiasts who demand quality and reliability. Review: Well designed works great - The kit has everything needed to install. Tech. support awesome! - I installed an older version of this in my car over 10 years ago. It was still working fine, but I didn't want to risk overheating, so I replaced it. Since I bought my first one the controller has been redesigned and is much improved. (Not that it was crappy before ;-) The fan speed ramps up and down over about a 10 degree range which is nice. It has a "soft" start so as to be easier on the charging system. Very important to me living in the south: It has a controller lead that can be wired to your AC compressor so that the fan comes on when the AC is running. This provides MUCH improved AC performance compared to my OEM fluid fan clutch. This feature alone made it worth installing for me! Tech. Support is available. It is speedy and knowledgeable. I spoke with AJ about some details of installing this on my "vintage" 1986 vehicle, and he was incredible helpful! All the parts that you will need are included in the kit, and he fuse block included is the most robust I have ever seen! I've had trouble in the past with the crappy fuse holders from the mass-market parts stores... I expect no trouble from this one! Review: High quality - Excellent fan controller assembly. instructions are clear and easy to follow. The hardest part was finding the space to mount it in my 1966 Mustang engine bay. ## Features - One Flex-A-Lite Variable Speed Controller with Electric Fan Relay Kit and Thread-In Temperature Sensor (31163) - This variable speed cooling fan controller has a built-in relay function, which means no need for external relays - Flex-A-Lite Variable Speed Control Module includes 1/4-inch NPT threaded temperature probe with 3/8-inch and 1/2-inch thread adapters - Automotive fan controller starts fans at 60 percent power and increases speed as temperature rises; and runs fans for up to 25 seconds after the vehicle is turned off to remove excess radiator heat - The Flex-A-Lite Variable Speed Controller is the perfect companion to automotive electric dual-fan systems ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B001UPYW1W | | Best Sellers Rank | #806,959 in Automotive ( See Top 100 in Automotive ) #179 in Automotive Replacement Engine Fan Electric Controls | | Brand | Flex-a-lite | | Brand Name | Flex-a-lite | | Customer Reviews | 4.5 out of 5 stars 141 Reviews | | Global Trade Identification Number | 00088657311632 | | Included Components | Wire, terminals | | Item Type Name | Variable Speed Control Module with Threaded Temperature Sensor | | Item Weight | 16 ounces | | Lower Temperature Rating | 160 Degrees Fahrenheit | | Manufacturer | Flex-a-lite | | Material | Metal, Plastic, Semiconductor | | Material Type | Metal, Plastic, Semiconductor | | Maximum Supply Voltage | 12 Volts (DC) | | Measurement Accuracy | ±2% | | Measuring Range | 160 - 240 °F | | Model | 31163 | | Mounting Type | Threaded | | Output Type | electrical signal | | Part Number | 31163 | | Response Time | 25 seconds | | Smart Home Compatibility | Not Smart Home Compatible | | Specific Uses For Product | automotive electric fan control, temperature-based fan speed adjustment | | Style | Modern | | Style Name | Modern | | UPC | 088657311632 | | Unit Count | 1.0 Count | | Upper Temperature Rating | 240 Degrees Fahrenheit | | Warranty Description | Warranty, Parts: Parts, Warranty, Labor: Authorized Dealer - Full Manufacturer's Warranty Applies | ## Product Details - **Brand:** Flex-a-lite - **Item Weight:** 1 Pounds - **Lower Temperature Rating:** 160 Degrees Fahrenheit - **Material:** Metal, Plastic, Semiconductor - **Style:** Modern ## Images ![Flex-A-Lite Variable Speed Controller and Relay Kit with Thread-In Temperature Sensor, Fan Controller With Temperature Probe (31163), Black - Image 1](https://m.media-amazon.com/images/I/71YKt-R3OmL.jpg) ![Flex-A-Lite Variable Speed Controller and Relay Kit with Thread-In Temperature Sensor, Fan Controller With Temperature Probe (31163), Black - Image 2](https://m.media-amazon.com/images/I/91lhApO9nfL.jpg) ![Flex-A-Lite Variable Speed Controller and Relay Kit with Thread-In Temperature Sensor, Fan Controller With Temperature Probe (31163), Black - Image 3](https://m.media-amazon.com/images/I/713sieoNpVL.jpg) ![Flex-A-Lite Variable Speed Controller and Relay Kit with Thread-In Temperature Sensor, Fan Controller With Temperature Probe (31163), Black - Image 4](https://m.media-amazon.com/images/I/716AIa5V3DL.jpg) ![Flex-A-Lite Variable Speed Controller and Relay Kit with Thread-In Temperature Sensor, Fan Controller With Temperature Probe (31163), Black - Image 5](https://m.media-amazon.com/images/I/818UrSYr+NL.jpg) ## Questions & Answers **Q: I need a replacement temp sensor anyone have a part number?** A: Replacement push-in probe 33073 Replacement thread-in probe 32050 Flex a lite part numbers **Q: How many fans is this rated to run at 12 volts each? I have 2 90 watt 12v fans and they don't seem to run at full speed with this switch.** A: You need to let them run for a bit to get up to full speed. If you want them to run full speed from the start just put them on a relay with a switch. **Q: Does this fit cherokee xj 2000?** A: Yes. It is universal. Just wire it into your system per the instructions. **Q: is this compatable with a flex-a-lite 180?** A: this is a universal fit item, so yes it should work fine ## Customer Reviews ### ⭐⭐⭐⭐⭐ Well designed works great - The kit has everything needed to install. Tech. support awesome! *by J***B on November 1, 2021* I installed an older version of this in my car over 10 years ago. It was still working fine, but I didn't want to risk overheating, so I replaced it. Since I bought my first one the controller has been redesigned and is much improved. (Not that it was crappy before ;-) The fan speed ramps up and down over about a 10 degree range which is nice. It has a "soft" start so as to be easier on the charging system. Very important to me living in the south: It has a controller lead that can be wired to your AC compressor so that the fan comes on when the AC is running. This provides MUCH improved AC performance compared to my OEM fluid fan clutch. This feature alone made it worth installing for me! Tech. Support is available. It is speedy and knowledgeable. I spoke with AJ about some details of installing this on my "vintage" 1986 vehicle, and he was incredible helpful! All the parts that you will need are included in the kit, and he fuse block included is the most robust I have ever seen! I've had trouble in the past with the crappy fuse holders from the mass-market parts stores... I expect no trouble from this one! ### ⭐⭐⭐⭐⭐ High quality *by J***M on May 19, 2026* Excellent fan controller assembly. instructions are clear and easy to follow. The hardest part was finding the space to mount it in my 1966 Mustang engine bay. ### ⭐⭐⭐⭐⭐ Works reliably. *by C***6 on November 23, 2025* Works well with the Flex-a-Lite 180 fan. Little bit of humming when the fan spins up I assumed after soft start part. Does not bother me like other people The fan works lol. I accidentally ordered this one with the thread in temperature sensor not the probe that goes into the radiator. I wedge the thread and sensor between the bottom of the fan and the bottom of the radiator touching metal and it works fine and it's temporary placement whenever the radiator is not cooling enough the fan kicks on reliably. I do plan on getting an adapter that attaches to the radiator hose to wire in the temp sensor to the coolant flow of the engine outlet. Just waiting for that stuff to arrive. Comes with a 45 amp fuse I'm running a single flex a light 180 series s blade fan. It only draws 20 amps under peak load. This controller can definitely run two or more fans as long as you stay within the amp rating of this fan controller. Plenty of wire for my 2003 Toyota Tacoma V6 with some to spare. I've watched videos online to where people screw the fan controller directly into the plastic housing of the engine fan, I opted to attach the controller to the metal fan mounting brackets. I use the bigger metal ones not the skinny long ones. perfect mounting place. ## Frequently Bought Together - Flex-A-Lite Variable Speed Controller and Relay Kit with Thread-In Temperature Sensor, Fan Controller With Temperature Probe (31163), Black - Flex-a-lite Flex-Wave LoBoy Electric Fan, Puller Fan, 16 Inches (238/105390) - Flex-A-Lite 1-1/2 Inch Inside Diameter In-line Radiator Hose Adapter (32082/107078) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tw/products/10784373-flex-a-lite-variable-speed-controller-and-relay-kit-thread](https://www.desertcart.tw/products/10784373-flex-a-lite-variable-speed-controller-and-relay-kit-thread) --- *Product available on Desertcart Taiwan* *Store origin: TW* *Last updated: 2026-06-18*