Best Automotive Replacement Engine Thermostats Under $100 (2026)
We ranked thermostats under $100 by a value score combining verified customer ratings, brand OEM/OE alignment, compatibility coverage, and included sealing hardware
Top Picks
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1
Motorcraft RT1201 Thermostat
Motorcraft RT1201 thermostat with gasket included; OEM-style fit for multiple vehicles. Customers note accurate fit and leak resistance. Includes thermostat housing gasket for a complete seal
- gasket included
- vehicle-specific fit
- leak resistance
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2
GM Original Equipment 131-160 Engine Coolant Thermostat with Seal
GM-recommended replacement thermostat with gasket for GM vehicles. Ensures proper temperature control and OEM fit. Customers note easy installation and good functionality
- GM OE specification
- Includes gasket
- OEM-quality fit
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3
Genuine Honda Thermostat Assembly
OEM Honda thermostat assembly designed for precise engine temperature control. Fits well and is easy to install, with noted value from users
- genuine oem part
- exact fit for Honda
- easy installation
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4
Gates Oe Engine Coolant Thermostat
Gates OE-type engine coolant thermostat with sturdy metal construction and precise temperature control. Customers note easy installation and good fit, with some reporting temperature around 190°F
- OE-type temperature control
- metal construction throughout
- reliable fitment for automotive engines
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5
Motorcraft RT1193 Thermostat
OEM-quality thermostat for automotive cooling systems with durable construction and easy-to-install design. Customers note solid fit and value, with varied ease of installation and mixed heat performance
- OEM quality and fit
- durable construction
- value for money
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6
AISIN Engine Coolant Thermostat with Housing and Gasket
AISIN OE-matched engine coolant thermostat set with housing and gasket delivers consistent performance and proper fit. Customers cite easy installation and reliable function, with some noting temperature matches OEM behavior
- OE matched compatibility
- includes housing and gasket
- ease of installation
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7
RV Thermostat 7330F3852 for Coleman Mach RV ACs (Single Stage)
RV thermostat compatible with Coleman Mach series. Supports single-stage heating/cooling with versatile compatibility. Customers note easy installation and quality for value
- compatibility with multiple Coleman Mach series
- single-stage heating/cooling control
- easy installation
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8
Thermostat single stage heat/cool for Coleman RV Mach series
Thermostat compatible with Coleman RV air conditioners, single stage heat/cool control for efficient temperature regulation. Customers report it works as intended and serves as a suitable replacement
- compatible with coleman mach series
- single stage heat/cool control
- rv-focused thermostat design
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9
RV thermostat for Coleman Mach air conditioners
Single-stage heating & cooling control compatible with Colemen Mach RV systems. Provides reliable thermostat replacement with solid functionality. Customer note: works as intended and serves as a replacement
- compatibility across Mach series
- single-stage control
- reliable replacement option
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10
RV Coleman AIRXCEL Digital Thermostat, Black
Digital 12V wall-mounted thermostat for select Coleman RV ACs. Controls heating and cooling with a single stage, black finish. Customer notes indicate compatibility constraints with specific Coleman AirXcel units
- 12V DC wall-mounted
- single stage heat/cool control
- designed for select Coleman AirXcel units