The 1990 Geo Prizm has 46 cooling system parts with verified fitment on this page — 7 part types and 22 brands, covering the 1.6L L4 engine. Each part includes a manufacturer part number and application notes.
On the 1990 Geo Prizm, 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 Coolant / Antifreeze (18 parts), Radiator (10 parts) and Radiator Cap (6 parts). The other 4 part types cover the remaining 12 parts.
Every part on this page is matched to the 1.6L L4 — the only engine offered in the 1990 Geo Prizm.
The most listed brands for 1990 Geo Prizm cooling system parts are PEAK (7 parts), PRESTONE (5 parts) and FVP (4 parts), plus 19 more brands. Quality grades include Standard Replacement, Economy and Premium.
8 parts on this 1990 Geo Prizm page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including FVP MV5050GAL (Coolant / Antifreeze) and FAMOUS BRAND 431276 (Radiator). 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 🇨🇦 CA | Prime YellowAll Vehicles | View on Amazon |
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP Popular | MV5050GAL | 🇺🇸 US 🇨🇦 CA | Extended LifeAll Makes / All Models | View on Amazon |
| PEAK | BQA1GAL | 🇺🇸 US 🇨🇦 CA | Blue Mountain Long LifeAll Vehicle | View on Amazon |
| PRESTONE | AF3100 | 🇺🇸 US 🇨🇦 CA | Prime Yellow - All VehiclesExtended Life | View on Amazon |
| VALVOLINE | 719009 | 🇺🇸 US 🇨🇦 CA | Multi-Vehicle Yellow1 Gallon | View on Amazon |
Heavy Duty
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Popular | ZXG051 | 🇺🇸 US 🇨🇦 CA | G05 Yellow1 Gallon | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Popular | AF2100 | 🇺🇸 US 🇨🇦 CA | All Vehicles10yr/300k mi | View on Amazon |
| PEAK | PKP1GAL | 🇺🇸 US 🇨🇦 CA | All Vehicles Antifreeze1 Gallon | View on Amazon |
| PEAK | PXA1GAL | 🇺🇸 US 🇨🇦 CA | Global Lifetime1 Gallon | View on Amazon |
| PRESTONE | AFMAX | 🇺🇸 US 🇨🇦 CA | Max Universal1 Gallon | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AISIN Popular | ACT002 | 🇺🇸 US 🇨🇦 CA | PinkHOAT | View on Amazon |
| FVP | GREEN5050GAL | 🇺🇸 US 🇨🇦 CA | Low Silicate Blend1 Gallon | View on Amazon |
| FVP | DEX5050GAL | 🇺🇸 US 🇨🇦 CA | Extended Life Blend1 Gallon | View on Amazon |
| PEAK | BMA1GAL | 🇺🇸 US 🇨🇦 CA | Blue Mountain Conventional Green1 Gallon | View on Amazon |
| PEAK | RUA1GAL | 🇺🇸 US 🇨🇦 CA | Conventional Green1 Gallon | View on Amazon |
| PEAK | FFA1GAL | 🇺🇸 US 🇨🇦 CA | Full Force Conventional Green1 Gallon | View on Amazon |
| PEAK | SEP1GAL | 🇺🇸 US 🇨🇦 CA | Sierra Conventional Green Concentrate Low Toxic Option1 Gallon | View on Amazon |
| PRESTONE | AF3300 | 🇺🇸 US 🇨🇦 CA | 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.
18 Coolant / Antifreeze parts for the 1990 Geo Prizm come from 5 brands — PEAK, PRESTONE, FVP and 2 other brands. 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, PEAK, PRESTONE 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, AISIN and 1 other brand supply 8 parts: built to original-equipment specification. A representative part number is AISIN ACT002.
Cooling Fan Control Module
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| US MOTOR WORKS | 16749 | 🇺🇸 US 🇨🇦 CA | Econo Control | View on Amazon |
| US MOTOR WORKS | 16789 | 🇺🇸 US 🇨🇦 CA | Better Control | View on Amazon |
| US MOTOR WORKS | 16795 | 🇺🇸 US 🇨🇦 CA | Best Control | View on Amazon |
This table covers the Cooling Fan control modules.
US MOTOR WORKS supplies the 3 Cooling Fan Control Module parts for the 1990 Geo Prizm.
Listed part numbers: US MOTOR WORKS 16749, US MOTOR WORKS 16789 and US MOTOR WORKS 16795.
Cooling System Tester Adapter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES | 31428 | 🇺🇸 US 🇨🇦 CA | May Require Spacer Number 31416 | View on Amazon |
| MOTORAD | 3121 | 🇺🇸 US 🇨🇦 CA | StandardRadiator Cap Adapter | View on Amazon |
| MOTORAD | 3122 | 🇺🇸 US 🇨🇦 CA | Standard | View on Amazon |
| STANT | 12021 | 🇺🇸 US 🇨🇦 CA | Radiator Cap/Cooling System Tester Adapter | View on Amazon |
This table covers the adapters used to pressure-test this cooling system.
4 Cooling System Tester Adapter parts for the 1990 Geo Prizm come from 3 brands — MOTORAD, GATES and STANT.
Listed part numbers: GATES 31428, MOTORAD 3121 and MOTORAD 3122, plus the other parts above.
Radiator
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FAMOUS BRAND Popular | 431276 | 🇺🇸 US 🇨🇦 CA | with Inlet (IN) The Middle of The Top TankRadiator Cap Not Included | View on Amazon |
| ULTRA-POWER Popular | 537 | 🇺🇸 US 🇨🇦 CA | 1 Row Equivalentwith Auto Trans | View on Amazon |
| GPD | 537C | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Premium (All Aluminum Construction)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| LILAND GLOBAL | 538AA | 🇺🇸 US 🇨🇦 CA | All AluminumCore Height: 12-3/4 | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AGILITY | 8010537 | 🇺🇸 US 🇨🇦 CA | Inlet (IN) Middle of Top Tank | View on Amazon |
| FVP | RAD537 | 🇺🇸 US 🇨🇦 CA | Automatic trans.1 ROW Equivalent | View on Amazon |
| OSC | 537 | 🇺🇸 US 🇨🇦 CA | Automatic trans.1 ROW Equivalent | View on Amazon |
| OSC | 539 | 🇺🇸 US 🇨🇦 CA | Automatic trans.Replaces 2 Row Original Equipment | View on Amazon |
| SPECTRA PREMIUM | CU1162 | 🇺🇸 US 🇨🇦 CA | with Inlet on Passenger Side of Top Tank | View on Amazon |
| SPECTRA PREMIUM | CU539 | 🇺🇸 US 🇨🇦 CA | with Inlet (IN) the Middle of the Top Tankwith Heavy Duty Cooling | View on Amazon |
This table covers the radiators that dump engine heat to airflow through the core. Typical signs include overheating in traffic, a wet core, or coolant that disappears with no puddle. Replace the cap if it cannot hold the rated pressure, and bleed the system after the swap.
10 Radiator parts for the 1990 Geo Prizm come from 8 brands — OSC, SPECTRA PREMIUM, FAMOUS BRAND and 5 other brands. The "Popular" part is FAMOUS BRAND 431276.
The Economy section: 3 options from FAMOUS BRAND, ULTRA-POWER and GPD. FAMOUS BRAND 431276 is listed in this group.
The Premium (All Aluminum Construction) section lists 1 option from LILAND GLOBAL — a step above OE specification in materials, tolerances or warranty terms. LILAND GLOBAL 538AA is listed in this group.
Standard Replacement: 6 parts, from OSC, SPECTRA PREMIUM, AGILITY and 1 other brand. A representative part number is AGILITY 8010537.
Radiator Cap
Locking Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CALORSTAT | RC0213 | 🇺🇸 US 🇨🇦 CA | PerformanceIncludes 2 seals | View on Amazon |
| GATES | 31533 | 🇺🇸 US 🇨🇦 CA | Safety Release Radiator Cap | View on Amazon |
| MOTORAD | ST13R | 🇺🇸 US 🇨🇦 CA | Safety Lever | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD Popular | T13R | 🇺🇸 US 🇨🇦 CA | Standard | View on Amazon |
| SKP Popular | SK10227 | 🇺🇸 US 🇨🇦 CA | Pressure Rating 13 psi | View on Amazon |
| GATES | 31333 | 🇺🇸 US 🇨🇦 CA | OE Type | 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.
6 Radiator Cap parts for the 1990 Geo Prizm come from 4 brands — GATES, MOTORAD, CALORSTAT and 1 other brand. The "Popular" part is MOTORAD T13R.
In the Locking Replacement grade, CALORSTAT, GATES and MOTORAD supply 3 parts: grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. A representative part number is CALORSTAT RC0213.
Standard Replacement: 3 parts, from MOTORAD, SKP and GATES. A representative part number is MOTORAD T13R.
Listed part numbers: MOTORAD T13R, CALORSTAT RC0213 and GATES 31533, plus the other parts above.
Radiator Drain Petcock
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 490232 | 🇺🇸 US 🇨🇦 CA | PlasticPush-In Threaded Lock | View on Amazon |
This table covers the petcocks used to drain the radiator.
One part is listed for the 1990 Geo Prizm — DORMAN 490232.
Radiator Fan Assembly
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SKP | SK620505 | 🇺🇸 US 🇨🇦 CA | 4 Blade | View on Amazon |
| TECHPRO | GM3115112 | 🇺🇸 US 🇨🇦 CA | Fits Base Modelor Automatic trans.GSi Model | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS | 75420 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| VDO / CONTINENTAL | FA70625 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the fan assemblies (and clutches, where listed) that pull air through the radiator.
4 Radiator Fan Assembly parts are listed for the 1990 Geo Prizm, from SKP, TECHPRO, FOUR SEASONS and 1 other brand.
Economy: 2 parts, from SKP and TECHPRO. A representative part number is SKP SK620505.
The Standard Replacement section: 2 options from FOUR SEASONS and VDO / CONTINENTAL. FOUR SEASONS 75420 is listed in this group.
This group includes SKP SK620505, TECHPRO GM3115112 and FOUR SEASONS 75420 and the remaining parts above.
Buying Cooling System Parts for a 1990 Geo Prizm
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 1.6L 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: Coolant / Antifreeze and Radiator .
Frequently Asked Questions
How many cooling system parts fit the 1990 Geo Prizm?
Our catalog currently lists 46 cooling system parts for the 1990 Geo Prizm across 7 subcategories and 22 brands, covering the 1.6L L4 engine. Each part is matched to the engine(s) it fits.
What are the signs of cooling system problems on a 1990 Geo Prizm?
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 1990 Geo Prizm 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 1990 Geo Prizm?
Every part on this page is matched to the 1.6L 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 1990 Geo Prizm
Cooling System Parts for Other Geo Prizm Years
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