This page lists 11 cooling system parts for the 2021 MG HS, across 2 part types, covering both the 1.5L L4 Turbocharged and the 2.0L L4 Turbocharged. Every part shows its brand, manufacturer part number and fitment notes.
On the 2021 MG HS, 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. All 11 listed parts are Coolant / Antifreeze (10 parts) and Temperature Sender / Sensor (1 part).
The 2021 MG HS was sold with both the 1.5L L4 Turbocharged and the 2.0L L4 Turbocharged. 10 parts fit every engine; the other 1 is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2021 MG HS cooling system parts are PRESTONE (5 parts), PEAK (4 parts) and VALVOLINE (1 part), plus 1 more brand. Quality grades include Premium, Economy and Compatible With All Colors.
2 parts on this 2021 MG HS page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including PRESTONE AF3100 (Coolant / Antifreeze) and PRESTONE AF2100 (Coolant / Antifreeze). 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: all 2021 HS engines | AF3055 | 🇲🇽 MX | Prime YellowAll Vehicles | View on Amazon |
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Popular Fits: all 2021 HS engines | AF3100 | 🇲🇽 MX | Prime Yellow - All VehiclesExtended Life | View on Amazon |
| PEAK Fits: all 2021 HS engines | BQA1GAL | 🇲🇽 MX | Blue Mountain Long LifeAll Vehicle | View on Amazon |
| VALVOLINE Fits: all 2021 HS engines | 719009 | 🇲🇽 MX | Multi-Vehicle Yellow1 Gallon | View on Amazon |
Heavy Duty
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Fits: all 2021 HS engines | AFC12100 | 🇲🇽 MX | Command Nitrite Free Extended Life CoolantYellow Nitrite Free OAT | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Popular Fits: all 2021 HS engines | AF2100 | 🇲🇽 MX | All Vehicles10yr/300k mi | View on Amazon |
| PEAK Fits: all 2021 HS engines | PKP1GAL | 🇲🇽 MX | All Vehicles Antifreeze1 Gallon | View on Amazon |
| PEAK Fits: all 2021 HS engines | PXA1GAL | 🇲🇽 MX | Global Lifetime1 Gallon | View on Amazon |
| PRESTONE Fits: all 2021 HS engines | AFMAX | 🇲🇽 MX | Max Universal1 Gallon | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PEAK Fits: all 2021 HS engines | PEP1GAL | 🇲🇽 MX | OET European Extended Life Pink1 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.
10 Coolant / Antifreeze parts for the 2021 MG HS come from 3 brands — PRESTONE, PEAK and VALVOLINE. The "Popular" part is PRESTONE AF3100. Every part fits both the 1.5L L4 Turbocharged and the 2.0L L4 Turbocharged.
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 3 options from PRESTONE, PEAK and VALVOLINE — the catalog's value-priced group. PRESTONE AF3100 is listed in this group.
In the Heavy Duty grade, PRESTONE supplies 1 part: rated for severe service. A representative part number is PRESTONE AFC12100.
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 supplies 1 part: built to original-equipment specification. A representative part number is PEAK PEP1GAL.
Temperature Sender / Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WALKER PRODUCTS Fits: 1.5L L4 Turbocharged | 2112191 | 🇲🇽 MX | SensorIncludes O-Ring | 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: WALKER PRODUCTS 2112191.
Buying Cooling System Parts for a 2021 MG HS
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. Some cooling system parts fit every engine; others are 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: Coolant / Antifreeze and Temperature Sender / Sensor .
Frequently Asked Questions
How many cooling system parts fit the 2021 MG HS?
Our catalog currently lists 11 cooling system parts for the 2021 MG HS across 2 subcategories and 4 brands, covering both the 1.5L L4 Turbocharged and the 2.0L L4 Turbocharged. Each part is matched to the engine(s) it fits.
Do cooling system parts differ between 2021 MG HS engines?
Some do. 10 parts fit every engine; the other 1 is engine-specific. Each row (and the filter at the top) shows which. 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 2021 MG HS?
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 2021 MG HS 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 2021 MG HS?
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 2021 MG HS
Cooling System Parts for Other MG HS Years
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