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Thermostats & Cooling Components - Marine Engine Parts

Marine Thermostats & Cooling Components

Marine Thermostats, Pumps, Impellers, Heat Exchangers, Hoses & Cooling Parts

Shop marine cooling system parts for inboard, sterndrive, outboard, gas, and diesel engines. Find thermostats, thermostat housings, raw-water pumps, circulation pumps, impellers, heat exchangers, oil coolers, strainers, coolant caps, hoses, clamps, gaskets, seals, temperature senders, and cooling service parts.

Shop Cooling Components Thermostats Impellers
Fitment Check

Match cooling parts by engine brand, model, serial number, existing part number, cooling layout, hose size, thermostat temperature, and pump style.

Ask Parts Desk

Overheating can come from more than one part. Check the full cooling path before assuming a thermostat, pump, impeller, hose, strainer, or heat exchanger is the only issue.

Find Cooling Parts Faster

Search by Part Number, Engine Model, Temperature, Hose Size, or Cooling Symptom

Use the search box for thermostats, thermostat housings, raw-water pumps, circulation pumps, impellers, coolers, hoses, clamps, strainers, caps, seals, senders, and cooling kits.

Popular Cooling Product Searches

ThermostatsMarine engine thermostats by brand, temperature, and application Thermostat HousingsHousings, covers, seals, bolts, and temperature-control hardware ImpellersRaw-water pump impellers and impeller service searches Raw-Water PumpsSeawater pumps, covers, cams, wear plates, and repair parts Water PumpsCirculation pumps, cooling pumps, and engine water pump searches Heat ExchangersHeat exchangers, end caps, tube bundles, gaskets, and seals Oil CoolersEngine oil, transmission, power steering, and fuel cooler searches Sea StrainersStrainers, caps, baskets, gaskets, and intake support Cooling HosesCoolant hose, seawater hose, molded hose, and replacement hose Hose ClampsStainless clamps, T-bolt clamps, and cooling hose hardware CoolantCoolant, antifreeze, additives, and closed-cooling fluid searches Pressure CapsCoolant caps, recovery caps, expansion tank caps, and seals Temp SendersTemperature senders, sensors, switches, alarms, and gauge support GasketsPump, thermostat, heat exchanger, cooler, and housing gaskets Seals & O-RingsO-rings, washers, end-cap seals, and cooling service parts Cooling KitsGrouped service parts for cooling-system maintenance

Raw-Water Side

Seawater Flow Protects the Engine and Exhaust

Raw-water systems depend on a clean intake path, healthy impeller, strong pump, good hoses, clear strainers, clean coolers, and proper exhaust water flow. Weak seawater flow can cause overheating quickly.

Raw-Water PumpsImpellersSea Strainers

Closed Cooling

Thermostats, Coolant, and Heat Exchangers Control Temperature

Closed-cooling systems depend on the right coolant, thermostat, circulation pump, pressure cap, heat exchanger, hoses, seals, and clean passages to keep engine temperature stable.

ThermostatsHeat ExchangersCoolant
TEMP

Control Temperature

Thermostats, senders, pumps, coolant, caps, and heat exchangers all affect stable operating temperature.

FLOW

Protect Water Flow

Impellers, strainers, hoses, clamps, pump covers, and coolers should be inspected when flow seems weak.

SEAL

Replace Seals Carefully

Use the correct gaskets, O-rings, washers, caps, and clamps when cooling parts are opened.

Cooling Service Help

Overheating Usually Deserves a Full-System Look

Replacing one part may not solve a cooling issue if the root cause is a clogged strainer, worn impeller, failing thermostat, soft hose, leaking cap, weak pump, blocked heat exchanger, air leak, or exhaust restriction.

Overheating SearchesCooling KitsAsk Parts Desk
Inspect seawater flowCheck seacock, strainer, hoses, impeller, pump cover, cam, wear plate, and discharge flow.
Check closed coolingConfirm coolant condition, coolant level, pressure cap, thermostat, circulation pump, and heat exchanger condition.
Watch for corrosionSalt trails, pitting, green deposits, clogged passages, and leaking end caps are warning signs.

Cooling Components FAQ

Choosing Marine Thermostats and Cooling Parts

How do I find the right marine thermostat?

Start with the engine brand, model, serial number, current thermostat part number, thermostat temperature rating, and housing style. Similar thermostats may not fit or operate correctly.

What causes a marine engine to overheat?

Common causes include worn impellers, clogged strainers, blocked heat exchangers, failing thermostats, soft hoses, weak pumps, low coolant, exhaust restrictions, or air leaks on the intake side.

Should gaskets and O-rings be replaced during cooling service?

Yes. When opening cooling components, use the correct replacement gaskets, O-rings, washers, seals, and clamps for the part and engine model.

Can the Parts Desk help identify cooling parts?

Yes. Send the engine brand, model, serial number, photos of the part, hose diameter, old part numbers, and the symptom you are trying to solve.

Shop Marine Thermostats, Pumps, Impellers, Heat Exchangers, Hoses & Cooling Parts

Find the cooling components and service parts needed to keep marine engines flowing properly and running at the right temperature.

Shop Cooling ComponentsConfirm Fitment

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Mercury Outboard Thermostat Assembly 120°F – 8M0090819

$144.55 - $144.55
$144.55
$144.55 - $144.55
$144.55
Only 1 left!

The Mercury / Quicksilver 8M0090819 Thermostat Assembly is a genuine OEM 120°F thermostat with integrated housing, designed for Mercury EFI 4-strok...

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$144.55 - $144.55
$144.55
$144.55 - $144.55
$144.55

MerCruiser Thermostat 160°F – 8M0076464 (496 MAG / 8.1L Big Block)

$61.92 - $61.92
$61.92
$61.92
$61.92 - $61.92
$61.92
Only 1 left!

The Mercury / Quicksilver 8M0076464 Thermostat is a genuine OEM 160°F (71°C) thermostat designed specifically for MerCruiser 8.1L big-block engines...

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$61.92 - $61.92
$61.92
$61.92
$61.92 - $61.92
$61.92

MerCruiser Thermostat – 882604

$159.21 - $159.21
$159.21
$159.21 - $159.21
$159.21
Only 1 left!

he Mercury MerCruiser 882604 Thermostat is a genuine OEM thermostat designed for MerCruiser CMD 1.7L diesel engines (DTI platform). This thermostat...

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$159.21 - $159.21
$159.21
$159.21 - $159.21
$159.21

Mercury MerCruiser Thermostat – 853213001

$53.15 - $53.15
$53.15
$53.15 - $53.15
$53.15
Only 1 left!

The Mercury MerCruiser Thermostat 853213001 is a genuine OEM cooling system component designed to regulate engine temperature and maintain optimal ...

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$53.15 - $53.15
$53.15
$53.15 - $53.15
$53.15

Mercury MerCruiser Thermostat Kit 807252T5

$76.48 - $76.48
$76.48
$76.48
$76.48 - $76.48
$76.48
Only 3 left!

Mercury 807252T5 is a genuine OEM 160°F thermostat kit for selected MerCruiser sterndrive and inboard engines. Mercury’s official listing ident...

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$76.48 - $76.48
$76.48
$76.48
$76.48 - $76.48
$76.48

MerCruiser Thermostat Kit – 807252T4

$99.93 - $99.93
$99.93
$99.93
$99.93 - $99.93
$99.93
in stock

The Mercury MerCruiser Thermostat Kit 807252T4 is a genuine OEM thermostat service kit designed for GM-based V6 and V8 MerCruiser engines using clo...

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$99.93 - $99.93
$99.93
$99.93
$99.93 - $99.93
$99.93

MerCruiser Thermostat Seal – 8071341

$14.84 - $14.84
$14.84
$14.84 - $14.84
$14.84
Only 2 left!

he Mercury MerCruiser Thermostat Seal 8071341 is a genuine OEM rubber sealing ring designed to properly seal the thermostat within the thermostat h...

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$14.84 - $14.84
$14.84
$14.84 - $14.84
$14.84

MerCruiser Thermostat 160°F – 76270T (3.7L 470 / 485)

$73.42 - $73.42
$73.42
$73.42 - $73.42
$73.42
Only 1 left!

The Mercury MerCruiser Thermostat 76270T is a genuine OEM 160°F thermostat designed primarily for early MerCruiser 3.7L (470/485) inline 4-cylinder...

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$73.42 - $73.42
$73.42
$73.42 - $73.42
$73.42

Mercury - Thermostat 120 - 14586

$61.90 - $61.90
$61.90
$61.90 - $61.90
$61.90

The Mercury Thermostat 14586 is a 120°F thermostat for Mercury 40 HP through 60 HP 4-stroke outboards, serial number 1C050252 and above. It helps r...

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$61.90 - $61.90
$61.90
$61.90 - $61.90
$61.90

Indmar LY6 Thermostat 160°F Drilled – 986115D

$58.22 - $58.22
$58.22
$58.22 - $58.22
$58.22
Only 1 left!

The Indmar Thermostat 986115D is a genuine OEM 160°F drilled thermostat designed for GM Gen IV LY6 and L96 marine engines equipped with closed cool...

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$58.22 - $58.22
$58.22
$58.22 - $58.22
$58.22

Indmar Thermostat Housing Gasket - OEM Engine Cooling Seal

$5.86 - $5.86
$5.86
$5.86
$5.86 - $5.86
$5.86
Only 5 left!

Premium OEM thermostat housing gasket engineered for Indmar marine engines. This precision-cut gasket creates a reliable seal between the thermosta...

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$5.86 - $5.86
$5.86
$5.86
$5.86 - $5.86
$5.86

Indmar Chevrolet Raw Water Thermostat Housing Gasket - OEM Seal

$5.85 - $5.85
$5.85
$5.85
$5.85 - $5.85
$5.85
Only 5 left!

Premium OEM thermostat housing gasket engineered for Indmar Chevrolet marine engines. This precision-cut gasket creates a reliable seal between the...

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$5.85 - $5.85
$5.85
$5.85
$5.85 - $5.85
$5.85

Westerbeke Thermostat 77°C (170°F) – 822-0377

$55.20 - $55.20
$55.20
$55.20 - $55.20
$55.20
Only 2 left!

The Westerbeke Thermostat 822-0377 is a genuine OEM 77°C (170°F) thermostat designed for Westerbeke marine diesel and gasoline engines as well as g...

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$55.20 - $55.20
$55.20
$55.20 - $55.20
$55.20

Crusader Thermostat 143°F – R026002E

$58.84 - $58.84
$58.84
$58.84 - $58.84
$58.84
Only 1 left!

The Crusader Thermostat R026002E is a genuine OEM 143°F (62°C) thermostat designed for Crusader and Pleasurecraft Marine (PCM) inboard engines runn...

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$58.84 - $58.84
$58.84
$58.84 - $58.84
$58.84
Sold out

Honeywell Home Digital Thermostat RTH5160D1016 - Marine HVAC Control

$0.00 - $0.00
$0.00
$68.87
$68.87 - $68.87
$68.87
Out of stock

Honeywell Home Digital Thermostat - Marine Climate Control Reliable digital thermostat for precise temperature control of your boat's heating and a...

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$0.00 - $0.00
$0.00
$68.87
$68.87 - $68.87
$68.87
Sold out

Yanmar Thermostat 105582-49200 - Marine Diesel Engine

$65.85 - $65.85
$65.85
$65.85
$65.85 - $65.85
$65.85
Only 4 left!

Genuine Yanmar Thermostat - Professional Marine Engine Component OEM thermostat designed for Yanmar marine diesel engines. Precision-engineered tem...

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$65.85 - $65.85
$65.85
$65.85
$65.85 - $65.85
$65.85