This page lists 36 cooling system parts for the 1966 Fiat 600D, across 3 part types, covering the 767cc L4 engine. Every part shows its brand, manufacturer part number and fitment notes.
The cooling system system on the 1966 Fiat 600D keeps operating temperature in the narrow band the engine was designed for, from radiator and water pump to thermostat and hoses. All 36 listed parts are Thermostat (17 parts), Coolant / Antifreeze (15 parts) and Radiator Hose (4 parts).
Every part on this page is matched to the 767cc L4 — the only engine offered in the 1966 Fiat 600D.
The most listed brands for 1966 Fiat 600D cooling system parts are MOTORAD (17 parts), PEAK (7 parts) and PRESTONE (5 parts), plus 5 more brands. Quality grades include Standard Replacement, Economy and Premium.
7 parts on this 1966 Fiat 600D page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including FVP MV5050GAL (Coolant / Antifreeze) and MOTORAD 2000160 (Thermostat). Click any part number to see every vehicle that part fits.
Coolant / Antifreeze
Compatible With All Colors
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE | AF3055 | 🇺🇸 US | Prime YellowAll Vehicles | View on Amazon |
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP Popular | MV5050GAL | 🇺🇸 US | Extended LifeAll Makes / All Models | View on Amazon |
| PRESTONE Popular | AF3100 | 🇺🇸 US | Prime Yellow - All VehiclesExtended Life | View on Amazon |
| PEAK | BQA1GAL | 🇺🇸 US | Blue Mountain Long LifeAll Vehicle | View on Amazon |
| VALVOLINE | 719009 | 🇺🇸 US | Multi-Vehicle Yellow1 Gallon | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Popular | AF2100 | 🇺🇸 US | All Vehicles10yr/300k mi | View on Amazon |
| PEAK | PKP1GAL | 🇺🇸 US | All Vehicles Antifreeze1 Gallon | View on Amazon |
| PEAK | PXA1GAL | 🇺🇸 US | Global Lifetime1 Gallon | View on Amazon |
| PRESTONE | AFMAX | 🇺🇸 US | Max Universal1 Gallon | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP | GREEN5050GAL | 🇺🇸 US | Low Silicate Blend1 Gallon | View on Amazon |
| PEAK | BMA1GAL | 🇺🇸 US | Blue Mountain Conventional Green1 Gallon | View on Amazon |
| PEAK | RUA1GAL | 🇺🇸 US | Conventional Green1 Gallon | View on Amazon |
| PEAK | FFA1GAL | 🇺🇸 US | Full Force Conventional Green1 Gallon | View on Amazon |
| PEAK | SEP1GAL | 🇺🇸 US | Sierra Conventional Green Concentrate Low Toxic Option1 Gallon | View on Amazon |
| PRESTONE | 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.
15 Coolant / Antifreeze parts for the 1966 Fiat 600D 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 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.
Radiator Hose
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DAYCO | 81031 | 🇺🇸 US | Flex Radiator Hose | View on Amazon |
| GATES | 25251 | 🇺🇸 US | Flexible | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO | 31610 | 🇺🇸 US 🇨🇦 CA | Gold / ProfessionalFlexible | View on Amazon |
Universal Hose (Straight, Bulk)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO | 31004 | 🇺🇸 US 🇨🇦 CA | Gold / ProfessionalStraight | 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.
4 Radiator Hose parts are listed for the 1966 Fiat 600D, from ACDELCO, DAYCO and GATES.
Economy: 2 parts, from DAYCO and GATES. A representative part number is DAYCO 81031.
The Standard Replacement section: 1 option from ACDELCO. ACDELCO 31610 is listed in this group.
The Universal Hose (Straight, Bulk) section lists 1 option from ACDELCO — grouped under the catalog's "Universal Hose (Straight, Bulk)" designation — the notes column spells out what sets them apart. ACDELCO 31004 is listed in this group.
Part numbers include DAYCO 81031, GATES 25251 and ACDELCO 31610, among others listed above.
Thermostat
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD | 300160 | 🇺🇸 US | Economy | View on Amazon |
| MOTORAD | 300195 | 🇺🇸 US | Economy | View on Amazon |
| MOTORAD | 300180 | 🇺🇸 US | Economy | View on Amazon |
Heavy Duty
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD | 5200160 | 🇺🇸 US | Ultra Stat | View on Amazon |
| MOTORAD | 5200180 | 🇺🇸 US | Ultra Stat | View on Amazon |
| MOTORAD | 5200195 | 🇺🇸 US | Ultra Stat | View on Amazon |
Performance
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD Popular | 2000160 | 🇺🇸 US | High Flow | View on Amazon |
| MOTORAD Popular | 2000195 | 🇺🇸 US | High Flow | View on Amazon |
| MOTORAD Popular | 2000180 | 🇺🇸 US | High Flow | View on Amazon |
| MOTORAD | MRD100 | 🇺🇸 US | Racing Thermostat | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD | 7200180 | 🇺🇸 US | Fail-Safe | View on Amazon |
| MOTORAD | 7200195 | 🇺🇸 US | Fail-Safe | View on Amazon |
| MOTORAD | 7200160 | 🇺🇸 US | Fail-Safe | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD Popular | 200180 | 🇺🇸 US | Standard | View on Amazon |
| MOTORAD | 200205 | 🇺🇸 US | Standard | View on Amazon |
| MOTORAD | 200195 | 🇺🇸 US | Standard | View on Amazon |
| MOTORAD | 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.
MOTORAD supplies the 17 Thermostat parts for the 1966 Fiat 600D. MOTORAD 2000160 carries the "Popular" badge.
Economy: 3 parts, from MOTORAD. A representative part number is MOTORAD 300160.
The Heavy Duty section lists 3 options from MOTORAD — rated for severe service. MOTORAD 5200160 is listed in this group.
In the Performance grade, MOTORAD supplies 4 parts: engineered beyond original-equipment specification. A representative part number is MOTORAD 2000160.
The Premium section: 3 options from MOTORAD. MOTORAD 7200180 is listed in this group.
The Standard Replacement section: 4 options from MOTORAD. MOTORAD 200180 is listed in this group.
Buying Cooling System Parts for a 1966 Fiat 600D
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.
- Confirm you have the 767cc L4 engine — every part on this page is matched to it.
- 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 1966 Fiat 600D?
Our catalog currently lists 36 cooling system parts for the 1966 Fiat 600D across 3 subcategories and 8 brands, covering the 767cc L4 engine. Each part is matched to the engine(s) it fits.
What are the signs of cooling system problems on a 1966 Fiat 600D?
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 1966 Fiat 600D 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 1966 Fiat 600D?
Every part on this page is matched to the 767cc L4 engine. 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 1966 Fiat 600D
Cooling System Parts for Other Fiat 600D Years
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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.