The 1963 Checker Marathon has 53 cooling system parts with verified fitment on this page — 6 part types and 9 brands, covering both the 3.7L 226cid L6 and the 5.2L 318cid V8. Each part includes a manufacturer part number and application notes.
On the 1963 Checker Marathon, the cooling system system keeps operating temperature in the narrow band the engine was designed for, from radiator and water pump to thermostat and hoses. Most of the listed parts are Thermostat (18 parts), Coolant / Antifreeze (16 parts) and Radiator Hose (8 parts). The other 3 part types cover the remaining 11 parts.
The 1963 Checker Marathon was sold with both the 3.7L 226cid L6 and the 5.2L 318cid V8. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 1963 Checker Marathon cooling system parts are MOTORAD (17 parts), GATES (14 parts) and PEAK (7 parts), plus 6 more brands. Quality grades include Standard Replacement, Economy and Premium.
11 parts on this 1963 Checker Marathon page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including FVP MV5050GAL (Coolant / Antifreeze) and MOTORAD T13 (Radiator Cap). Click any part number to see every vehicle that part fits.
Coolant / Antifreeze
Compatible With All Colors
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Fits: 3.7L 226cid L6 | AF3055 | 🇺🇸 US | Prime YellowAll Vehicles | View on Amazon |
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP Popular Fits: 3.7L 226cid L6 | MV5050GAL | 🇺🇸 US | Extended LifeAll Makes / All Models | View on Amazon |
| PRESTONE Popular Fits: 3.7L 226cid L6 | AF3100 | 🇺🇸 US | Prime Yellow - All VehiclesExtended Life | View on Amazon |
| PEAK Fits: 3.7L 226cid L6 | BQA1GAL | 🇺🇸 US | Blue Mountain Long LifeAll Vehicle | View on Amazon |
| VALVOLINE Fits: 3.7L 226cid L6 | 719009 | 🇺🇸 US | Multi-Vehicle Yellow1 Gallon | View on Amazon |
Heavy Duty
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Popular Fits: 3.7L 226cid L6 | ZXG051 | 🇺🇸 US | G05 Yellow1 Gallon | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Popular Fits: 3.7L 226cid L6 | AF2100 | 🇺🇸 US | All Vehicles10yr/300k mi | View on Amazon |
| PEAK Fits: 3.7L 226cid L6 | PKP1GAL | 🇺🇸 US | All Vehicles Antifreeze1 Gallon | View on Amazon |
| PEAK Fits: 3.7L 226cid L6 | PXA1GAL | 🇺🇸 US | Global Lifetime1 Gallon | View on Amazon |
| PRESTONE Fits: 3.7L 226cid L6 | AFMAX | 🇺🇸 US | Max Universal1 Gallon | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP Fits: 3.7L 226cid L6 | GREEN5050GAL | 🇺🇸 US | Low Silicate Blend1 Gallon | View on Amazon |
| PEAK Fits: 3.7L 226cid L6 | BMA1GAL | 🇺🇸 US | Blue Mountain Conventional Green1 Gallon | View on Amazon |
| PEAK Fits: 3.7L 226cid L6 | RUA1GAL | 🇺🇸 US | Conventional Green1 Gallon | View on Amazon |
| PEAK Fits: 3.7L 226cid L6 | FFA1GAL | 🇺🇸 US | Full Force Conventional Green1 Gallon | View on Amazon |
| PEAK Fits: 3.7L 226cid L6 | SEP1GAL | 🇺🇸 US | Sierra Conventional Green Concentrate Low Toxic Option1 Gallon | View on Amazon |
| PRESTONE Fits: 3.7L 226cid L6 | AF3300 | 🇺🇸 US | Prime Conventional Green 1 Gallon | View on Amazon |
This table covers the engine coolants and antifreeze formulations specified for this cooling system. Typical signs include a rising temperature gauge, rusty or sludged coolant, or a heater that blows cold. Use the chemistry named in the notes. Mixing silicate, OAT and HOAT formulas can gel in the radiator.
16 Coolant / Antifreeze parts for the 1963 Checker Marathon come from 4 brands — PEAK, PRESTONE, FVP and 1 other brand. The "Popular" part is FVP MV5050GAL.
In the Compatible With All Colors grade, PRESTONE supplies 1 part: grouped under the catalog's "Compatible With All Colors" designation — the notes column spells out what sets them apart. A representative part number is PRESTONE AF3055.
The Economy section lists 4 options from FVP, PRESTONE, PEAK and 1 other brand — the catalog's value-priced group. FVP MV5050GAL is listed in this group.
In the Heavy Duty grade, VALVOLINE supplies 1 part: rated for severe service. A representative part number is VALVOLINE ZXG051.
In the Premium grade, PRESTONE and PEAK supply 4 parts: a step above OE specification in materials, tolerances or warranty terms. A representative part number is PRESTONE AF2100.
In the Standard Replacement grade, PEAK, FVP and PRESTONE supply 6 parts: built to original-equipment specification. A representative part number is FVP GREEN5050GAL.
Cooling System Tester Adapter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Fits: 3.7L 226cid L6 | 31413 | 🇺🇸 US | Cooling System PressureRadiator Cap | View on Amazon |
| MOTORAD Fits: 3.7L 226cid L6 | 3003 | 🇺🇸 US | StandardIncluded In Tester Kit | View on Amazon |
This table covers the adapters used to pressure-test this cooling system.
2 Cooling System Tester Adapter parts for the 1963 Checker Marathon come from 2 brands — GATES and MOTORAD.
Part numbers include GATES 31413 and MOTORAD 3003.
Radiator Cap
Locking Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Fits: 3.7L 226cid L6 | 31511 | 🇺🇸 US | Safety Release Radiator Cap | View on Amazon |
| MOTORAD Fits: 3.7L 226cid L6 | ST13 | 🇺🇸 US | Safety Lever | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD Popular Fits: 3.7L 226cid L6 | T13 | 🇺🇸 US | Standard | View on Amazon |
| GATES Fits: 3.7L 226cid L6 | 31527 | 🇺🇸 US | OE Type | View on Amazon |
| SKP Fits: 3.7L 226cid L6 | SK10229 | 🇺🇸 US | Pressure Rating 13 psi | View on Amazon |
This table covers the caps that hold system pressure at the radiator or reservoir neck. Typical signs include a leak at the neck, a cap that will not hold pressure, or a missing tether. Match the pressure rating or thread in the notes — radiator, reservoir and fuel caps are not interchangeable.
5 Radiator Cap parts for the 1963 Checker Marathon come from 3 brands — GATES, MOTORAD and SKP. The "Popular" part is MOTORAD T13.
In the Locking Replacement grade, GATES and MOTORAD supply 2 parts: grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. A representative part number is GATES 31511.
Standard Replacement: 3 parts, from MOTORAD, GATES and SKP. A representative part number is MOTORAD T13.
Part numbers include MOTORAD T13, GATES 31511 and MOTORAD ST13, among others listed above.
Radiator Hose
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Popular Fits: 3.7L 226cid L6 | 25478 | 🇺🇸 US | Flexible | View on Amazon |
| ACDELCO Fits: 3.7L 226cid L6 | 31637 | 🇺🇸 US 🇨🇦 CA | Gold / ProfessionalFlexible | View on Amazon |
| ACDELCO Fits: 3.7L 226cid L6 | 31634 | 🇺🇸 US 🇨🇦 CA | Gold / ProfessionalFlexible | View on Amazon |
| GATES Fits: 3.7L 226cid L6 | 25474 | 🇺🇸 US | Flexible | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Popular Fits: 3.7L 226cid L6 | 21794 | 🇺🇸 US | Molded | View on Amazon |
| ACDELCO Fits: 3.7L 226cid L6 | 22007M | 🇺🇸 US 🇨🇦 CA | Professional / GoldMolded | View on Amazon |
| ACDELCO Fits: 3.7L 226cid L6 | 24238L | 🇺🇸 US 🇨🇦 CA | Professional / GoldMolded | View on Amazon |
| GATES Fits: 3.7L 226cid L6 | 20230 | 🇺🇸 US | Molded | View on Amazon |
This table covers the upper, lower and connecting hoses between radiator, engine and reservoir. Typical signs include swelling, cracks, a soft spot, or a leak at a clamp. Replace adjacent aged hoses while the system is drained — they share the same heat cycle.
8 Radiator Hose parts are listed for the 1963 Checker Marathon, from GATES and ACDELCO. GATES 25478 carries the "Popular" badge.
Economy: 4 parts, from GATES and ACDELCO. A representative part number is GATES 25478.
The Standard Replacement section: 4 options from GATES and ACDELCO. GATES 21794 is listed in this group.
Part numbers include GATES 25478, ACDELCO 31637 and ACDELCO 31634, among others listed above.
Thermostat
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Fits: 3.7L 226cid L6 | 33508 | 🇺🇸 US | Economy | View on Amazon |
| GATES Fits: 3.7L 226cid L6 | 33509 | 🇺🇸 US | Economy | View on Amazon |
| MOTORAD Fits: 3.7L 226cid L6 | 300160 | 🇺🇸 US | Economy | View on Amazon |
| MOTORAD Fits: 3.7L 226cid L6 | 300195 | 🇺🇸 US | Economy | View on Amazon |
| MOTORAD Fits: 3.7L 226cid L6 | 300180 | 🇺🇸 US | Economy | View on Amazon |
Heavy Duty
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD Fits: 3.7L 226cid L6 | 5200160 | 🇺🇸 US | Ultra Stat | View on Amazon |
| MOTORAD Fits: 3.7L 226cid L6 | 5200180 | 🇺🇸 US | Ultra Stat | View on Amazon |
Performance
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD Popular Fits: 3.7L 226cid L6 | 2000160 | 🇺🇸 US | High Flow | View on Amazon |
| MOTORAD Popular Fits: 3.7L 226cid L6 | 2000180 | 🇺🇸 US | High Flow | View on Amazon |
| MOTORAD Fits: 3.7L 226cid L6 | MRD100 | 🇺🇸 US | Racing Thermostat | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD Fits: 3.7L 226cid L6 | 7200180 | 🇺🇸 US | Fail-Safe | View on Amazon |
| MOTORAD Fits: 3.7L 226cid L6 | 7200160 | 🇺🇸 US | Fail-Safe | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD Popular Fits: 3.7L 226cid L6 | 200195 | 🇺🇸 US | Standard | View on Amazon |
| MOTORAD Popular Fits: 3.7L 226cid L6 | 200180 | 🇺🇸 US | Standard | View on Amazon |
| GATES Fits: 3.7L 226cid L6 | 33009 | 🇺🇸 US | OE Type | View on Amazon |
| GATES Fits: 3.7L 226cid L6 | 33006 | 🇺🇸 US | OE Type | View on Amazon |
| GATES Fits: 3.7L 226cid L6 | 33008 | 🇺🇸 US | OE Type | View on Amazon |
| MOTORAD Fits: 3.7L 226cid L6 | 200160 | 🇺🇸 US | Standard | View on Amazon |
This table covers the thermostats that open the coolant circuit at the specified temperature. Typical signs include slow warm-up, a gauge that climbs in traffic, or heat that never quite arrives. Replace the housing gasket with the thermostat and bleed the system so a trapped air pocket does not cook the new part.
18 Thermostat parts are listed for the 1963 Checker Marathon, from MOTORAD and GATES. MOTORAD 2000160 carries the "Popular" badge.
Economy: 5 parts, from MOTORAD and GATES. A representative part number is GATES 33508.
The Heavy Duty section: 2 options from MOTORAD. MOTORAD 5200160 is listed in this group.
In the Performance grade, MOTORAD supplies 3 parts: engineered beyond original-equipment specification. A representative part number is MOTORAD 2000160.
The Premium section: 2 options from MOTORAD. MOTORAD 7200180 is listed in this group.
The Standard Replacement section: 6 options from MOTORAD and GATES. MOTORAD 200195 is listed in this group.
Thermostat / Thermostat Housing / Water Outlet Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO Fits: 3.7L 226cid L6 | 1273 | 🇺🇸 US | Water Outlet Seal | View on Amazon |
| GATES Fits: 3.7L 226cid L6 | 34030 | 🇺🇸 US | Thermostat Gasket - 3 1/4" x 3 1/2" Gasket Material | View on Amazon |
| GATES Fits: 3.7L 226cid L6 | 33635 | 🇺🇸 US | Thermostat Gasket - 4" x 6" Gasket Material | View on Amazon |
| MOTORAD Fits: 3.7L 226cid L6 | MG30 | 🇺🇸 US | Base Model | View on Amazon |
This table covers the seals at the thermostat housing and water outlet. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
4 Thermostat / Thermostat Housing / Water Outlet Seal parts for the 1963 Checker Marathon come from 3 brands — GATES, FEL-PRO and MOTORAD.
This group includes FEL-PRO 1273, GATES 34030 and GATES 33635 and the remaining parts above.
Buying Cooling System Parts for a 1963 Checker Marathon
On this vehicle, the cooling system system keeps operating temperature in the narrow band the engine was designed for, from radiator and water pump to thermostat and hoses.
- Match the engine first. Every cooling system part here is engine-specific; each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the thermostat and refill with fresh coolant whenever you change a water pump or radiator; original hoses on an older vehicle are on borrowed time.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Thermostat and Coolant / Antifreeze .
Frequently Asked Questions
How many cooling system parts fit the 1963 Checker Marathon?
Our catalog currently lists 53 cooling system parts for the 1963 Checker Marathon across 6 subcategories and 9 brands, covering both the 3.7L 226cid L6 and the 5.2L 318cid V8. Each part is matched to the engine(s) it fits.
Do cooling system parts differ between 1963 Checker Marathon engines?
Yes. Every cooling system part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of cooling system problems on a 1963 Checker Marathon?
Common symptoms include a rising temperature gauge in traffic, sweet-smelling steam, crusty deposits around hose clamps, or a heater that blows cold. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the thermostat and refill with fresh coolant whenever you change a water pump or radiator; original hoses on an older vehicle are on borrowed time.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 1963 Checker Marathon was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 1963 Checker Marathon?
First match the engine — each row shows which engine(s) the part fits. Then replace coolant with the exact specification the manufacturer calls for — mixing chemistries can gel and block small passages. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 1963 Checker Marathon
Cooling System Parts for Other Checker Marathon Years
Switch vehicle or jump to a subcategory
Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.