🌡️ Stay cool, tow hard, and never overheat with Mishimoto’s precision thermostat!
The Mishimoto MMTS-RAM-99L is a high-performance, low-temperature racing thermostat designed specifically for 1999-2013 Dodge Ram trucks with 5.9L and 6.7L Cummins engines. It activates coolant flow earlier at 180°F, improving engine cooling efficiency under extreme towing and warm climate conditions. Constructed from durable aluminum and backed by a lifetime warranty, it ensures reliable, long-lasting performance and a perfect direct fit for hassle-free installation.
| Brand | Mishimoto |
| Model Name | MMTS-RAM-99L |
| Controller Type | Manual Controller |
| Color | Silver |
| Specific Uses For Product | Improving cooling system reliability in 1999-2013 Dodge Ram 2500, 3500 models with 5.9L/6.7L Cummins engines, particularly in warmer climates or under extreme driving conditions |
| Temperature Control Type | Temperature-activated |
| Included Components | (1) Mishimoto Thermostat (1) O-ring Mishimoto Lifetime Warranty |
| Power Source | Battery Powered |
| Item Weight | 3.2 ounces |
| Material | Aluminum |
| Shape | Rectangular |
| Display Type | analog |
| Control Method | Touch |
| Style | Modern |
| Backlight | No |
| UPC | 748354013146 |
| Global Trade Identification Number | 00748354013146 |
| Manufacturer | Mishimoto |
| Control Type | Manual Control |
| Product Dimensions | 2.55 x 2.55 x 2.55 inches |
| Country of Origin | China |
| Item model number | MMTS-RAM-99L |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | MMTS-RAM-99L |
| OEM Part Number | MMTS-RAM-99L |
D**S
Fixed my overheating issue
I have an 05 cummins 3500 put a brand new stant 180 thermostat in an fought an overheating issue, replaced rad to mishimoto and did fan clutch and water pump same issues, went to the mishimoto thermostat and cured my issue runs 175-183 in 86* outside, only time will tell about longevity, happy so far
B**N
Cheaply made and does not last… Could send debris into engine.
Don’t waist your time or money on this thermostat. Lasted about a week before it cracked. Best to stick with OEM from a Cummins dealer for $50.
G**.
Worth every penny
It's been in for a while now and is doing good. I had two stock ones fail withing a week. This one has been on two 20 hr trips now.
J**D
It doesn't stay at 180F. it's an expensive waste of money
In the winter time the engine doesn't warm up. the junk thermostat stays open. Not worth $80 dollars. You can buy a cheap parts store unit for $20 dollars or less.. Save $60 dollars.
A**R
Cools engine temp down to 180
Easy to install
R**N
cold mode.
I opens up around 178 and help keep my truck cooler. My fuel mileage went down and I ask dodge about it and under 190 the truck stays in cold mode and is giving a extra phase to the injectors.
J**Y
wow 10 psi more oil pressure
the truck has not been over 170 and its 90 outside best 62 dollars i ever spent
P**Z
It fell apart and now I have shrapnel in my motor.
Had this in my recently new motor. 5.9 cummins. Thought it would help with cooling. In the beginning it made about a 10 to 15 degrees difference. I thought this is great then about 3 months the truck started to run slightly hot. Checked everything and then came across this. All parts clip backing and retainer have yet to be found. If you buy this buyer beware. Diesel engines are not cheap.
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Hace 1 mes
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