Skip to content
Real Shop Help Call or text before you order Install Available Request install help Repair Status Track approved service work Fitment Review Check clearance before checkout Local Shop Support Hamilton, NJ performance help
Photo - Primary
User 3
User 2
Photo - in package
User 1
Logo Image
Mishimoto

Mishimoto 89-93 Dodge 5.9L Cummins 79C High-Temperature Thermostat

Manufacturer part number: MMTS-RAM-89L

Sale
Seen it cheaper? Send us the link. If we can beat it, we will.
CODE: MISMMTS-RAM-89L
$71.00
$64.95 Backorder — not currently in stock Sold out
BACKORDER — not currently in stock

This item is on backorder. A shipping date is not confirmed. Contact us for current lead time: 609-249-4921.

View our return policy

Buy now, pay later with Shop Pay.

Choose Shop Pay at checkout to see your available payment options.

Rates from 0-36% APR. Payment options through Shop Pay Installments are subject to an eligibility check and are provided by these lending partners: affirm.com/lenders. Options depend on your purchase amount, and a down payment may be required. State notices to consumers: affirm.com/licenses.

Buy nowCheckout this item

Share your vehicle details now, or choose to provide them later. For multiple items or installation, use Add to cart.

Shipping and applicable taxes are calculated at checkout.

Select a vehicle info status to continue.

Shipping and applicable taxes are calculated at checkout.

Need it by a certain date? Call 609-249-4921 before ordering. Online availability does not confirm stock at our Hamilton shop; please call ahead for pickup or installation.

Your vehicle

Select or change your vehicle here before checkout. You stay on this product while Hurrey’s keeps the fitment context.

View compatible vehicles

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 (174.2F) compared to the factory thermostat (180F). 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.

  • Lower activation temperature allows coolant to flow through the system earlier, maintaining lower coolant temperatures
  • Ideal for vehicles in warm climates or under extreme driving/towing conditions
  • Includes thermostat and high-quality replacement gasket

This Part Fits:

Year Make Model Submodel
1989-1993 Dodge D250 Base
1989-1993 Dodge D350 Base
1989-1993 Dodge W250 Base
1989-1993 Dodge W350 Base
Back to top