47 Cooling system parts are listed for the 1966 MG Midget, in 5 part types, covering both the 1.1L L4 and the 1.3L L4. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 1966 MG Midget, 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. 45 parts of the 47 listed are Thermostat (25 parts), Coolant / Antifreeze (17 parts) and Thermostat / Thermostat Housing / Water Outlet Seal (3 parts). The other 2 part types cover the remaining 2 parts.
The 1966 MG Midget was sold with both the 1.1L L4 and the 1.3L L4. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 1966 MG Midget cooling system parts are MOTORAD (17 parts), PEAK (7 parts) and PRESTONE (6 parts), plus 7 more brands. Quality grades include Standard Replacement, Economy and Premium.
9 parts on this 1966 MG Midget 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 Fits: 1.1L L4 | AF3055 | 🇺🇸 US | Prime YellowAll Vehicles | View on Amazon |
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP Popular Fits: 1.1L L4 | MV5050GAL | 🇺🇸 US | Extended LifeAll Makes / All Models | View on Amazon |
| PRESTONE Popular Fits: 1.1L L4 | AF3100 | 🇺🇸 US | Prime Yellow - All VehiclesExtended Life | View on Amazon |
| PEAK Fits: 1.1L L4 | BQA1GAL | 🇺🇸 US | Blue Mountain Long LifeAll Vehicle | View on Amazon |
| VALVOLINE Fits: 1.1L L4 | 719009 | 🇺🇸 US | Multi-Vehicle Yellow1 Gallon | View on Amazon |
Heavy Duty
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Popular Fits: 1.1L L4 | ZXG051 | 🇺🇸 US | G05 Yellow1 Gallon | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Popular Fits: 1.1L L4 | AF2100 | 🇺🇸 US | All Vehicles10yr/300k mi | View on Amazon |
| PEAK Fits: 1.1L L4 | PKP1GAL | 🇺🇸 US | All Vehicles Antifreeze1 Gallon | View on Amazon |
| PEAK Fits: 1.1L L4 | PXA1GAL | 🇺🇸 US | 1 GallonGlobal Lifetime | View on Amazon |
| PRESTONE Fits: 1.1L L4 | AF6110 | 🇺🇸 US | MAX Original EquipmentEuropean Blue | View on Amazon |
| PRESTONE Fits: 1.1L L4 | AFMAX | 🇺🇸 US | Max Universal1 Gallon | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP Fits: 1.1L L4 | GREEN5050GAL | 🇺🇸 US | Low Silicate Blend1 Gallon | View on Amazon |
| PEAK Fits: 1.1L L4 | BMA1GAL | 🇺🇸 US | Blue Mountain Conventional Green1 Gallon | View on Amazon |
| PEAK Fits: 1.1L L4 | RUA1GAL | 🇺🇸 US | Conventional Green1 Gallon | View on Amazon |
| PEAK Fits: 1.1L L4 | FFA1GAL | 🇺🇸 US | Full Force Conventional Green1 Gallon | View on Amazon |
| PEAK Fits: 1.1L L4 | SEP1GAL | 🇺🇸 US | Sierra Conventional Green Concentrate Low Toxic Option1 Gallon | View on Amazon |
| PRESTONE Fits: 1.1L L4 | 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.
17 Coolant / Antifreeze parts for the 1966 MG Midget 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 5 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
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Fits: 1.1L L4 | 20802 | 🇺🇸 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.
One part is listed for the 1966 MG Midget — GATES 20802.
Temperature Sender / Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 1.1L L4 | TS233 | 🇺🇸 US | Fits with Gaug | View on Amazon |
This table covers the senders that report coolant temperature to the gauge or ECU. Typical signs include a gauge that sits on empty or overheat, or a lamp that does not match what the engine is doing. Rule out the cluster and the wiring before replacing the sender.
This group shows a single part: STANDARD MOTOR PRODUCTS TS233.
Thermostat
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Fits: 1.1L L4 | 33508 | 🇺🇸 US | Economy | View on Amazon |
| GATES Fits: 1.1L L4 | 33509 | 🇺🇸 US | Economy | View on Amazon |
| MOTORAD Fits: 1.1L L4 | 300160 | 🇺🇸 US | Economy | View on Amazon |
| MOTORAD Fits: 1.1L L4 | 300195 | 🇺🇸 US | Economy | View on Amazon |
| MOTORAD Fits: 1.1L L4 | 300180 | 🇺🇸 US | Economy | View on Amazon |
Heavy Duty
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD Fits: 1.1L L4 | 5200160 | 🇺🇸 US | Ultra Stat | View on Amazon |
| MOTORAD Fits: 1.1L L4 | 5200180 | 🇺🇸 US | Ultra Stat | View on Amazon |
| MOTORAD Fits: 1.1L L4 | 5200195 | 🇺🇸 US | Ultra Stat | View on Amazon |
Performance
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD Popular Fits: 1.1L L4 | 2000160 | 🇺🇸 US | High Flow | View on Amazon |
| MOTORAD Popular Fits: 1.1L L4 | 2000180 | 🇺🇸 US | High Flow | View on Amazon |
| MOTORAD Popular Fits: 1.1L L4 | 2000195 | 🇺🇸 US | High Flow | View on Amazon |
| MOTORAD Fits: 1.1L L4 | MRD100 | 🇺🇸 US | Racing Thermostat | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD Fits: 1.1L L4 | 7200180 | 🇺🇸 US | Fail-Safe | View on Amazon |
| MOTORAD Fits: 1.1L L4 | 7200195 | 🇺🇸 US | Fail-Safe | View on Amazon |
| MOTORAD Fits: 1.1L L4 | 7200160 | 🇺🇸 US | Fail-Safe | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD Popular Fits: 1.1L L4 | 200195 | 🇺🇸 US | Standard | View on Amazon |
| MOTORAD Popular Fits: 1.1L L4 | 200180 | 🇺🇸 US | Standard | View on Amazon |
| BECK/ARNLEY Fits: 1.1L L4 | 1430156 | 🇺🇸 US | Alternate TemperatureGasket/Seal Not Included | View on Amazon |
| BECK/ARNLEY Fits: 1.1L L4 | 1430149 | 🇺🇸 US | OE TemperatureGasket/Seal Not Included | View on Amazon |
| BECK/ARNLEY Fits: 1.1L L4 | 1430131 | 🇺🇸 US | Alternate TemperatureGasket/Seal Not Included | View on Amazon |
| GATES Fits: 1.1L L4 | 33009 | 🇺🇸 US | OE Type | View on Amazon |
| GATES Fits: 1.1L L4 | 33006 | 🇺🇸 US | OE Type | View on Amazon |
| GATES Fits: 1.1L L4 | 33008 | 🇺🇸 US | OE Type | View on Amazon |
| MOTORAD Fits: 1.1L L4 | 200205 | 🇺🇸 US | Standard | View on Amazon |
| MOTORAD Fits: 1.1L L4 | 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.
25 Thermostat parts are listed for the 1966 MG Midget, from MOTORAD, GATES and BECK/ARNLEY. MOTORAD 2000160 carries the "Popular" badge.
Economy: 5 parts, from MOTORAD and GATES. A representative part number is GATES 33508.
The Heavy Duty section: 3 options from MOTORAD. 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: 10 options from MOTORAD, BECK/ARNLEY and GATES. MOTORAD 200195 is listed in this group.
Thermostat / Thermostat Housing / Water Outlet Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY Fits: 1.1L L4 | 0390004 | 🇺🇸 US | OE TypeThermostat Seal | View on Amazon |
| MAHLE / CLEVITE Fits: 1.1L L4 | C24093 | 🇺🇸 US | Paper | View on Amazon |
| VICTOR REINZ Fits: 1.1L L4 | 711352300 | 🇺🇸 US | Fiberwith 3 Bolt Holes | 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.
3 Thermostat / Thermostat Housing / Water Outlet Seal parts for the 1966 MG Midget come from 3 brands — BECK/ARNLEY, MAHLE / CLEVITE and VICTOR REINZ.
Part numbers include BECK/ARNLEY 0390004, MAHLE / CLEVITE C24093 and VICTOR REINZ 711352300.
Buying Cooling System Parts for a 1966 MG Midget
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 1966 MG Midget?
Our catalog currently lists 47 cooling system parts for the 1966 MG Midget across 5 subcategories and 10 brands, covering both the 1.1L L4 and the 1.3L L4. Each part is matched to the engine(s) it fits.
Do cooling system parts differ between 1966 MG Midget 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 1966 MG Midget?
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 MG Midget 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 MG Midget?
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 1966 MG Midget
Cooling System Parts for Other MG Midget Years
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