Cooling Spare Parts

4336659 180°F Thermostat for Cummins ISX QSX15

Q: What numbers are documented for 4336659?

Primary Cummins Part Number: 4336659. Published Alternate Thermostat Reference: 4973373. Relationship labels distinguish formatting aliases, direct interchanges, remanufactured references and related assemblies.

Q: How do I confirm 4336659 before ordering?

Match the complete part number, compare the connector or mounting arrangement with the product photos, and confirm the machine or engine model and serial range. Send clear photos of the original unit when requesting a quote.

4336659 180°F Thermostat for Cummins ISX QSX15, OEM/reference 4336659, 180°F Engine Coolant Thermostat, product view 1

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OEM / reference4336659

Specification180°F Engine Coolant Thermostat

Catalog ID51051440

Engine-coolant thermostat identified by Cummins 4336659, rated at 180°F (approximately 82°C) for ISX/QSX 15-litre applications. Published cross-reference lists include 4973373, but it is retained as an alternate thermostat reference rather than an unqualified direct interchange. The old 24V field was removed as inapplicable.

Product Type: Engine Coolant Thermostat
Product Brand: EexcavaStart
Opening Temperature: 180°F / approximately 82°C
Electrical Rating: Not applicable
Condition: New replacement part

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Send the machine model, engine model or nameplate photo so our team can confirm compatibility before shipment.

Part-number relationships

Relationship	Reference family	Number
Primary Cummins Part Number	180°F engine-coolant thermostat	4336659
Published Alternate Thermostat Reference	Published cross-reference; direct interchange not asserted	4973373

Product fitment guide

Part numbers and compatible models

Quickly compare the reference number and recorded machine applications. Use the original photos and the checklist before ordering.

Part identification

Reference numbers

Primary number

4336659

Other documented relationship

4973373

Formatting aliases are the same number written differently. Related assemblies and remanufactured numbers are not presented as direct interchanges.

Product summary

180°F Engine Coolant Thermostat

Category: Cooling Spare Parts
Catalog ID: 51051440
Photo views: 4

Before ordering

Confirm these details

Match the complete part number on the original component.
Compare connectors, mounting points and visible dimensions with the product photos.
Confirm the exact machine or engine model and serial range before ordering.

Machine fitment

Compatible model references

2 model references

Published engine families: Cummins ISX / QSX15
Fitment limitation: Confirm thermostat quantity, housing and engine CPL

Compatibility lists identify searchable model families, not every production serial range. Confirm the original part number and machine serial number before purchase.

Quick fitment answers

Common questions about 4336659

Which machines use 4336659?

Recorded compatible model references include Published engine families: Cummins ISX / QSX15, Fitment limitation: Confirm thermostat quantity, housing and engine CPL. Confirm the complete part number and machine serial range before ordering.

What numbers are documented for 4336659?

No alternate number is listed for 4336659. Send the original nameplate for an alternate-number check.

How do I confirm 4336659 before ordering?

Match the complete part number on the original component. Compare connectors, mounting points and visible dimensions with the product photos. Confirm the exact machine or engine model and serial range before ordering. Send clear photos of the original unit and connector layout when requesting a quote.

Continue comparing verified references from the same system.

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