will this thermostat fit a 5.9l ISB engine in a motorhome?

It fits 2007 Cummings 5.9 just right Never had any problems runs great brings down temperature by about 25 degrees

Do this fit the 2012 ram 3500 6.7?

Yes, this thermostat will fit your 2012 6.7 Cummins. If you have any other questions please send an email to support@mishimoto.com and we would be happy to assist further. Thanks, Mishimoto

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Mishimoto mmts-RAM-99L Low-Temperature Racing Thermostat Compatible With Dodge 5.9L 6.7L Cummins 1999-2013

Mishimoto mmts-RAM-99L Low-Temperature Racing Thermostat Compatible With Dodge 5.9L 6.7L Cummins 1999-2013

Product ID: 323234077

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Details

Brand
Mishimoto
Model name
MMTS-RAM-99L
Controller type
Mishimoto
Special features
Ideal for Warm
Colour
Silver

🔥Optimized for extreme towing & warm climates

🚛Fits Dodge 5.9L & 6.7L Cummins (1999-2013)

🌡️180°F low activation temp

Description

🌡️ Stay cool, tow hard, and lead the pack with Mishimoto’s low-temp racing thermostat!

LIGHTWEIGHT PRECISION - Compact 90.7g design ensures quick response without added bulk.
RACE READY RELIABILITY - Mishimoto’s trusted racing-grade thermostat keeps your engine cooler, longer.
TACKLE HEAT LIKE A PRO - Ideal for warm climates and heavy towing, preventing overheating under pressure.
COOL SOONER RUN STRONGER - Activates coolant flow at 180°F vs OEM 190°F for superior engine protection.
TAILORED FOR DODGE CUMMINS - Specifically engineered for 1999-2013 Dodge Ram 5.9L & 6.7L engines—perfect fit, no guesswork.

The Mishimotommts-RAM-99L is a precision-engineered low-temperature racing thermostat designed for Dodge Ram 5.9L and 6.7L Cummins engines from 1999 to 2013. Activating coolant flow at 180°F, it improves engine cooling efficiency compared to the OEM 190°F thermostat, making it ideal for warm climates and demanding towing conditions. Lightweight and compact, it ensures reliable temperature regulation to protect your engine during extreme driving.

Specifications

Manufacturer	Mishimoto
Brand	Mishimoto
Model	MMTS-RAM-99L
Product Dimensions	6.48 x 6.48 x 6.48 cm; 90.72 g
Item model number	MMTS-RAM-99L
Manufacturer Part Number	MMTS-RAM-99L
OEM Part Number	MMTS-RAM-99L
Mirror Adjustment	Button Control
Special Features	Ideal for Warm Climates
Item Weight	90.7 g

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