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1993, 1992, 1991, 1990, 1989 Dodge D350 Engine Coolant Thermostat
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1989 - 1993 Dodge D350 Engine Coolant Thermostat (Mishimoto) NEW

Out of Stock
$ 64 .95
120-DayReturns
LifetimeWarranty
100%Money-Back

Product Notes Read before buying

The 12-valve first-gen Cummins in your Ram is considered one of the best diesel engines ever produced, and for good reason. Fuel efficiency, torque, and simplicity are just a few characteristics that give the Cummins its stellar reputation. We're huge fans of the Cummins engine, which is why we’ve developed a low-temperature thermostat for the 1989-1993 5.9L 12v Cummins. This Mishimoto thermostat activates at a lower temperature (174.2°F) compared to the factory thermostat (180°F). By lowering the activation temperature, coolant flows through the radiator earlier, maintaining lower fluid temperatures. The Mishimoto low-temperature thermostat is ideal for vehicles in warmer climates, or for use in vehicles experiencing extreme driving/towing conditions. This thermostat includes a high-quality replacement gasket and our signature Mishimoto Lifetime Warranty.
Brand: Mishimoto
Condition: New
See Other Dodge D350 Engine Coolant Thermostats
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Specifications & Info


Attribute Value
Install Difficulty 2
SellingPoint01 Direct Fit For 1989-1993 Dodge Ram With 5.9l Cummins
SellingPoint02 Lower Activation Temperature Allows Coolant To Flow Through The System Earlier, Maintaining Lower Coolant Temperatures
SellingPoint03 Ideal For Vehicles In Warm Climates Or Under Extreme Driving/towing Conditions
SellingPoint04 Includes Thermostat And High-quality Replacement Gasket
SellingPoint05 Mishimoto Lifetime Warranty
SellingPoint06 N/a
SellingPoint07 N/a
SellingPoint08 N/a
SellingPoint09 N/a
SellingPoint10 N/a
SellingPoint11 N/a
SellingPoint12 N/a
SellingPoint13 N/a
SellingPoint14 N/a
SellingPoint15 N/a
TechSpec Applications Dodge D250 I6 (5.9l) 1989-1993--dodge D350 I6 (5.9l) 1989-1993--dodge W250 I6 (5.9l) 1989-1993--dodge W350 I6 (5.9l) 1989-1993
TechSpec Chassis Codes D/w Series
TechSpec Engine Codes 6bt
TechSpec Includes (1) Mishimoto Thermostat--(1) Thermostat Gasket--mishimoto Lifetime Warranty
TechSpec Mishimoto Activation Temperature (F) 174.2
TechSpec Note N/a
TechSpec OEM Activation Temperature (F) 180

Vehicle Fitment Guide

This part fits the following vehicles:

Dodge 1 model (tapclick to expand)(tapclick to hide)
D350 1989-1993 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Base Cab & Chassis 1989 - 1993 L6 5.9L DIESEL Turbo RWD Automatic & Manual
Base Cab & Chassis 1989 - 1993 V8 5.9L RWD Automatic & Manual
Base Extended Cab Pickup 1992 - 1993 L6 5.9L DIESEL Turbo RWD Automatic & Manual
Base Extended Cab Pickup 1992 - 1993 V8 5.9L RWD Automatic & Manual
Base Standard Cab Pickup 1989 - 1993 L6 5.9L DIESEL Turbo RWD Automatic & Manual
Base Standard Cab Pickup 1989 - 1993 V8 5.9L RWD Automatic & Manual
RD Standard Cab Pickup 1989 - 1993 V8 5.9L RWD Manual
Verify before ordering — please confirm your vehicle's year, make, model and sub-model specifications before placing your order. If anything is unclear, our customer service team is available to help.

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Shipping Information

We offer fast, reliable shipping on all orders:

  • Ships to all countries via US Postal Service Priority Mail.
  • Most orders ship within 1 business day.
  • Delivery time: 1-4 business days after shipment.
  • International shipping available, including APO/FPO addresses.
  • Tracking information provided for all shipments.
  • Additional handling fees may apply for oversized/overweight packages.

Return Policy

We want you to be 100% satisfied with your purchase. That's why we offer:

  • 120-Day Returns - Return any part within 120 days from date of receipt.
  • Must obtain RMA (Return Merchandise Authorization) number before returning.
  • Parts must be in original condition, uninstalled, unaltered, and in original packaging.
  • Important: Electrical parts are not returnable if unsealed.
  • Please inspect parts upon arrival and notify us within 5 days of receiving incorrect or damaged parts.
  • Refunds processed after warehouse receives return and credited to original payment method.

Warranty

This part comes with a limited lifetime warranty. Warranty begins on the original purchase date.

Warranty does NOT cover:

  • Shipping costs or labor expenses.
  • Installation errors.
  • Parts used for racing.
  • Commercial vehicle parts.
The 12-valve first-gen Cummins in your Ram is considered one of the best diesel engines ever produced, and for good reason. Fuel efficiency, torque, and simplicity are just a few characteristics that give the Cummins its stellar reputation. We're huge fans of the Cummins engine, which is why we’ve developed a low-temperature thermostat for the 1989-1993 5.9L 12v Cummins. This Mishimoto thermostat activates at a lower temperature (174.2°F) compared to the factory thermostat (180°F). By lowering the activation temperature, coolant flows through the radiator earlier, maintaining lower fluid temperatures. The Mishimoto low-temperature thermostat is ideal for vehicles in warmer climates, or for use in vehicles experiencing extreme driving/towing conditions. This thermostat includes a high-quality replacement gasket and our signature Mishimoto Lifetime Warranty.

Interchange Parts

Brand Part Number
Stant 14058

Fits Years: 1989 1990 1991 1992 1993

Fits Models: D350

Expert Guide

Engine Coolant Thermostat Guide for the 1989-1993 Dodge D350

Keep your first-generation Cummins running at the right temperature by choosing the correct replacement thermostat.

 Read Full Guide →
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