Overview
The Mishimoto MMTSCHV01DH is a pair of high temperature thermostats for the 6.6L Duramax engine, with one 185 degree and one 191 degree unit. It fits 2001 to 2013 Chevrolet Silverado 2500 HD, 3500 and 3500 HD models.
These thermostats open at a higher temperature than the OEM units, which keeps coolant in the engine longer and helps it warm up sooner. Mishimoto positions them for owners in colder climates or those who have trouble reaching operating temperatures, and the Lifetime Warranty applies.
Key features
- One 185 degree and one 191 degree thermostat in the set
- Higher activation temperature for faster warm-up in cold conditions
- Built for the 6.6L Duramax engine
- Lifetime warranty
Warm-up and cold weather driving
Engine temperature affects fuel delivery, emissions controls and how a diesel responds in cold weather. A thermostat that opens too early can keep the engine cooler than intended, while one that opens late lets it warm up more quickly. On a Duramax, the thermostat is one of several parts that control coolant flow, so any change in warm-up behavior is worth watching after installation.
Consider how the truck is used before choosing a higher-temperature set. Towing, hauling and steady highway driving keep the engine hot on their own, while short trips in cold weather may benefit from faster warm-up. If the truck already runs at normal temperature, a thermostat change is unlikely to add much, so check the cooling fan, radiator and coolant level first.
When replacing thermostats, clean the housing seat, check the sealing surface, and use fresh coolant of the correct type. Check the gauge during the first few drives and recheck the coolant level after the engine cools. Keep a record of the change so later cooling problems are easier to trace.
Specifications
| Brand | Mishimoto |
|---|---|
| Part number | MMTSCHV01DH |
| UPC | 748354804508 |
| Engine | 6.6L Duramax |
| Temperature rating | 185 and 191 degrees, one of each |
| Contents | 2 thermostats |
| Warranty | Lifetime |
Vehicle fitment
It fits the 2001 to 2013 Chevrolet Silverado 2500 HD (Base, LS, LT, LTZ, WT), 2007 Silverado 2500 HD Classic, 2001 to 2006 Silverado 3500, 2007 Silverado 3500 Classic, and 2007 to 2013 Silverado 3500 HD.
Silverado 1500 and other Chevrolet or GMC models are not in this list. Confirm your vehicle’s year, model and trim before ordering.
What’s included
Two thermostats: one rated 185 degrees and one rated 191 degrees.
