Mishimoto MMT‑RAM‑89L Low‑Temperature Thermostat
Mishimoto MMT‑RAM‑89L Low‑Temperature Thermostat
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Description:
The Mishimoto MMT-RAM-89L Low Temperature Thermostat is a high-quality replacement for the broken thermostat in your 1989-1993 Dodge 5.9L Cummins diesel. This thermostat has a lower activation temperature than the stock thermostat, allowing coolant to begin circulating through the engine sooner — helping reduce and maintain lower engine operating temperatures during hot weather or heavy towing/driving use. Designed as a direct-fit replacement and backed by the Mishimoto Lifetime Warranty, it’s ideal for trucks in warmer climates or demanding conditions.
Features:
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Direct drop-in replacement for the stock thermostat
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Lower activation temperature helps keep your engine cooler
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Ideal for warmer climates and heavy-load driving/towing
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Covered by the Mishimoto Lifetime Warranty
Specifications:
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Fits: 1989-1993 Dodge with 5.9L Cummins engine
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Manufacturer Part #: MMTS-RAM-89L
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Warranty: Mishimoto Lifetime
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FAQ
How long does shipping take?
Most products ship in 3–7 days. Some will take longer. If a product needs more time, it will say so on its product page.
How do I know if a product fits my truck?
Each product page lists the year, make, and model it fits.
If you’re unsure, you can message us through our website, email, or Facebook, and we’ll confirm fitment for you.
Do you offer installation?
Yes. PSC Automotive & Diesel Repair installs everything we sell.
Call or message us to schedule an appointment.
What is your return policy?
- Returns accepted on new, unused items.
Some items are subject to a restocking fee, depending on the manufacturer.
Electrical parts, tuners, and custom-built items are non-returnable.
Full details are on our Refunds page.
What is your warranty policy?
Our warranty matches the manufacturer’s warranty.
If a part fails or has a defect, we will work with the manufacturer to get it replaced.
We do not warranty parts that were:
Installed incorrectly
Damaged by lack of maintenance
Removed or messed with after installation
Installed by another shop after we installed it
Full warranty details are on our Warranty page.
Will I get tracking information?
Yes. Tracking is emailed to you as soon as your order ships.
Check your spam folder if you don’t see it.
Do you offer customer support?
Yes! You can contact us anytime at:
Website chat
Email
Phone
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We reply quickly during business hours.