---
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: "2215 Lei"
currency: RON
in_stock: true
url: https://www.desertcart.ro/products/87900688-flex-a-lite-variable-speed-controller-and-relay-kit-thread
store_origin: RO
region: Romania
---

# 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:** 2215 Lei
**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?** 2215 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/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

Flex-a-lite Variable Speed Controller and Relay Kit with Thread-In Temperature Sensor, Fan Controller With Temperature Probe (31163), Black

## 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)

## 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

## 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)

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**Shop now:** [https://www.desertcart.ro/products/87900688-flex-a-lite-variable-speed-controller-and-relay-kit-thread](https://www.desertcart.ro/products/87900688-flex-a-lite-variable-speed-controller-and-relay-kit-thread)

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-05-16*