Skip to product information
57_18f9a00c-99eb-41d5-bd8e-99c45283bebd - Northline Parts

Water Temperature Sensor Switch MM432-104 1850218 for MTD Bolens Troy-Bilt

SKU: NLT2T00130
$23.79 In Stock
$23.79
Sale price  $23.79 Regular price 
Ships for free in 2–4 business days.
This is a brand new aftermarket coolant temperature switch for MTD, Bolens and Troy-Bilt equipment using water-temperature switch MM432-104 / 1850218. It is made as a replacement for the matching original component and is ready to install once fitment is confirmed, replacing reference numbers MM432-104, 1850218.
Estimated delivery between
Shop at Northline Parts Best Customer Service Best Online Parts

Let Northline Parts Do the Heavy Lifting for You!

Not sure which part you need? Our team can help you find the right replacement.

Parts Support Hours: Monday–Friday, 8:00 AM–5:00 PM CT

Live Chat: Available 24/7

I reached out for some replacement head bolts and they responded quickly with a few questions and cautionary information and is sending me some bolts. Great customer service! Thanks

Edward H. — Verified customer

Compatible Models

We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.

Compatible equipment / model
  • Select MTD equipment
  • Select Bolens equipment
  • Select Troy-Bilt equipment

Product Overview

An incorrect temperature reading, warning circuit that never comes on, or a warning that stays active even when the engine is cold can point to the coolant temperature switch or its wiring on MTD, Bolens and Troy-Bilt equipment using water-temperature switch MM432-104 / 1850218.

Inspect the connector and verify the cooling system is actually operating at the correct temperature first. A failed switch can send the wrong signal even when the engine itself is cooling normally.

Key Features & Performance

  • New aftermarket coolant temperature switch for the listed application
  • Designed to replace the original component without changing the machine's basic system layout
  • Built for dependable service in agricultural, construction, industrial, or power-equipment use as applicable

Replaces Part Numbers

  • MM432-104
  • 1850218

Common Uses

  • Replacing a worn or failed coolant temperature switch
  • Repairing equipment that shows the related operating symptoms described above
  • Restoring dependable operation during scheduled repair or overhaul work

Technical Specifications

  • Product Type: Coolant Temperature Switch
  • Condition: New aftermarket replacement

Installation & Fitment

  • Match the original part number whenever it is available
  • Compare mounting points, connectors, ports, shaft style, or gasket pattern with the original component
  • Use the machine serial number and engine model when the manufacturer lists serial-number breaks

Compatibility Notice

Parts can vary by engine, serial number, production date, or equipment configuration. Verify the original component and machine information before ordering.

Frequently Asked Questions

Q: What should I check before ordering? A: Match the original part number and compare the mounting, connections, and application information with the part currently on the machine.

Q: Is this a genuine OEM part? A: No. This is a new aftermarket replacement. Brand names and OE numbers are used only to identify the intended application.

Part Summary

keywords: coolant temperature switch, mtd, bolens and troy-bilt equipment using water-temperature switch mm432-104 / 1850218, mm432-104, 1850218

Brand names, model numbers, and reference part numbers are used for identification and compatibility purposes only. Verify the original component, dimensions, and application before purchase.

Customers also purchased