---
product_id: 87900688
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: "C$31589"
currency: NIO
in_stock: true
reviews_count: 6
category: "Flex A Lite"
url: https://www.desertcart.ni/products/87900688-flex-a-lite-variable-speed-controller-and-relay-kit-thread
store_origin: NI
region: Nicaragua
---

# Built-in 45A relay, no external relay needed Fans run 25s post-shutdown Adjustable temp range 160-240°F 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:** C$31589
**Availability:** ✅ In Stock

## Summary

> 🌬️ Keep your engine cool, your ride smarter — don’t get left in the heat!

## 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?** C$31589 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ni](https://www.desertcart.ni/products/87900688-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

- • **Smart Thermal Control:** Starts fans at 60% power, ramps to 100% as engine heats up for efficient cooling
- • **Integrated Relay Power:** Built-in relay eliminates bulky external components, streamlining your setup
- • **Plug & Play Reliability:** Complete kit with fuse, wiring, and terminals backed by a 1-year warranty for peace of mind
- • **Post-Drive Heat Management:** Continues fan operation for 25 seconds after shutdown to protect your radiator
- • **Precision Temperature Sensing:** Includes thread-in sensor with multiple adapters for perfect fit and accurate readings

## Overview

The Flex-A-Lite 31163 Variable Speed Controller is a high-performance automotive fan controller designed for dual-fan systems. Featuring an adjustable activation temperature between 160-240°F, a built-in 45-amp relay, and a thread-in temperature sensor with versatile adapters, it optimizes cooling by starting fans at 60% power and scaling up as needed. It also runs fans for 25 seconds after engine shutdown to prevent overheating. This all-in-one kit includes wiring, fuse, and terminals, ensuring easy installation and reliable operation backed by a 1-year warranty.

## Description

The Flex-a-lite variable speed control module is an adjustable fan controller that can be set to have your fans come on at any temperature between 160-240 fahrenheit. When fans come on with temperature, they are activated at 60 per cent run using a soft start feature, which greatly reduces startup amperage. As the temperature rises about 10 degrees, the controller gradually increases fan speeds up to 100 per cent.

Review: Works very well - Installation was straight forward and is easy to setup. The electric fans on my mustang now start much less quieter and so far have only needed the low speed to keep the car cool, will see what happens in the summer.
Review: funktioniert sehr gut - Gute justierung.

## 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 |
|---------------|-------|
| Manufacturer | Flex-A-Lite |
| Brand | Flex-a-lite |
| Model | 31163 |
| Item model number | 31163 |
| Exterior | Machined |
| Manufacturer part number | 31163 |
| OEM Part Number | N |
| Special Features | Manual |
| Item Weight | 454 g |

## Product Details

- **Brand:** Flex-a-lite
- **Material:** Metal, Plastic, Semiconductor
- **Item weight:** 454 g
- **Style:** Modern
- **Lower temperature rating:** 160 Degrees Fahrenheit

## 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

### ⭐⭐⭐⭐⭐ Works very well
*by A***R on 6 April 2024*

Installation was straight forward and is easy to setup. The electric fans on my mustang now start much less quieter and so far have only needed the low speed to keep the car cool, will see what happens in the summer.

### ⭐⭐⭐⭐⭐ funktioniert sehr gut
*by W***M on 11 August 2025*

Gute justierung.

### ⭐⭐⭐⭐⭐ Perfect
*by D***T on 21 September 2020*

This item works perfectly. Much better than the probe in the rad fins unit.

## Frequently Bought Together

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*Product available on Desertcart Nicaragua*
*Store origin: NI*
*Last updated: 2026-06-21*