This page lists 39 cooling system parts for the 2003 Avanti Ii, across 8 part types, covering the 5.7L V8 engine. Every part shows its brand, manufacturer part number and fitment notes.
On the 2003 Avanti Ii, 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 Water Pump Gasket (11 parts), Coolant / Antifreeze (10 parts) and Thermostat / Thermostat Housing / Water Outlet Seal (4 parts). The other 5 part types cover the remaining 14 parts.
Every part on this page is matched to the 5.7L V8 — the only engine offered in the 2003 Avanti Ii.
The most listed brands for 2003 Avanti Ii cooling system parts are FEL-PRO (5 parts), VICTOR REINZ (5 parts) and PRESTONE (4 parts), plus 13 more brands. Quality grades include Economy, Premium and Standard Replacement.
5 parts on this 2003 Avanti Ii page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including FVP MV5050GAL (Coolant / Antifreeze) and FEL-PRO 35635 (Water Pump Gasket). 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 |
| PEAK | BQA1GAL | 🇺🇸 US | Blue Mountain Long LifeAll Vehicle | View on Amazon |
| PRESTONE | AF3100 | 🇺🇸 US | Prime Yellow - All VehiclesExtended Life | View on Amazon |
| VALVOLINE | 719009 | 🇺🇸 US | Multi-Vehicle Yellow1 Gallon | View on Amazon |
Heavy Duty
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE | ZXG051 | 🇺🇸 US | G05 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 |
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 2003 Avanti Ii come from 4 brands — PRESTONE, PEAK, VALVOLINE 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, 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.
Coolant Hose / Pipe Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING | 868630 | 🇺🇸 US | COOLANT PIPE | View on Amazon |
This table covers the seals at the Coolant Hose / Pipe. 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.
One part is listed for the 2003 Avanti Ii — ELRING 868630.
Coolant Water Crossover Mounting Set
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO | ES73027 | 🇺🇸 US | Coolant bleed pipe seals | View on Amazon |
| MAHLE / CLEVITE | GS33845 | 🇺🇸 US | Molded Rubber | View on Amazon |
| VICTOR REINZ | 181002301 | 🇺🇸 US | View on Amazon |
This table covers the Coolant Water Crossover Mounting sets.
3 Coolant Water Crossover Mounting Set parts for the 2003 Avanti Ii come from 3 brands — FEL-PRO, MAHLE / CLEVITE and VICTOR REINZ.
Listed part numbers: FEL-PRO ES73027, MAHLE / CLEVITE GS33845 and VICTOR REINZ 181002301.
Thermostat / Thermostat Housing / Water Outlet Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING | 658490 | 🇺🇸 US | Inner Diameter [MM]: 58,7 | View on Amazon |
| FEL-PRO | 35632 | 🇺🇸 US | Thermostat Seal | View on Amazon |
| MAHLE / CLEVITE | 72141 | 🇺🇸 US | Molded Rubber | View on Amazon |
| VICTOR REINZ | 711347200 | 🇺🇸 US | Thermostat Seal | 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 2003 Avanti Ii come from 4 brands — ELRING, FEL-PRO, MAHLE / CLEVITE and 1 other brand.
This group includes ELRING 658490, FEL-PRO 35632 and MAHLE / CLEVITE 72141 and the remaining parts above.
Water Pump
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS | WU5081 | 🇺🇸 US | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DAYCO | DP1317 | 🇺🇸 US | Serpentine Belt Driven | View on Amazon |
| FVP | 1307290 | 🇺🇸 US | View on Amazon | |
| GMB | 1307290 | 🇺🇸 US | View on Amazon |
This table covers the pumps that circulate coolant through the block and radiator. Typical signs include coolant at the weep hole, pulley play, or a growl from the front of the engine. Replace the thermostat and refill with the specified coolant whenever the pump comes off.
4 Water Pump parts are listed for the 2003 Avanti Ii, from WJB / INMOTION PARTS, DAYCO, FVP and 1 other brand.
Economy: 1 part, from WJB / INMOTION PARTS. A representative part number is WJB / INMOTION PARTS WU5081.
The Standard Replacement section lists 3 options from DAYCO, FVP and GMB — built to original-equipment specification. DAYCO DP1317 is listed in this group.
This group includes WJB / INMOTION PARTS WU5081, DAYCO DP1317 and FVP 1307290 and the remaining parts above.
Water Pump Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO Popular | 35635 | 🇺🇸 US | To Block | View on Amazon |
| FEL-PRO Popular | ES73010 | 🇺🇸 US | Gasket Kit | View on Amazon |
| MAHLE / CLEVITE Popular | K31628 | 🇺🇸 US | Contains 2 GasketsMolded Rubber | View on Amazon |
| APEX | AWP3016 | 🇺🇸 US | View on Amazon | |
| ELRING | 868650 | 🇺🇸 US | View on Amazon | |
| ELRING | 853300 | 🇺🇸 US | Gasket Design: Metal Elastomer Gasket | View on Amazon |
| ENGINE PRO | 3112630223 | 🇺🇸 US | Also Fits LS6 Engine | View on Amazon |
| MELLING | MWPG500 | 🇺🇸 US | Contains 2 gaskets | View on Amazon |
| ULTRA-POWER | 35635 | 🇺🇸 US 🇨🇦 CA | Water Pump Mounting Gasket | View on Amazon |
| VICTOR REINZ | 711468800 | 🇺🇸 US | View on Amazon | |
| VICTOR REINZ | 181002001 | 🇺🇸 US | Mounting Set | View on Amazon |
This table covers the gaskets between the water pump and the block or housing. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
11 Water Pump Gasket parts for the 2003 Avanti Ii come from 8 brands — FEL-PRO, ELRING, VICTOR REINZ and 5 other brands. The "Popular" part is FEL-PRO 35635.
Water Pump Seal / O-Ring
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| APEX | AWP3151 | 🇺🇸 US | View on Amazon | |
| FEL-PRO | 35633 | 🇺🇸 US | O-Ring | View on Amazon |
| VICTOR REINZ | 411041500 | 🇺🇸 US | View on Amazon |
This table covers the Water Pump Seal O-rings. Typical signs include a seep at a fitting or a housing that weeps after a service. Lube the new O-ring with the fluid it will see, and do not roll it into the groove.
3 Water Pump Seal / O-Ring parts are listed for the 2003 Avanti Ii, from APEX, FEL-PRO and VICTOR REINZ.
This group includes APEX AWP3151, FEL-PRO 35633 and VICTOR REINZ 411041500.
Water Pump Stud Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ARP | 1343201 | 🇺🇸 US 🇨🇦 CA | Hex Bolt Head | View on Amazon |
| ARP | 4343202 | 🇺🇸 US 🇨🇦 CA | Stainless Steel12 Point Bolt Head | View on Amazon |
| ARP | 1343202 | 🇺🇸 US 🇨🇦 CA | Black Oxide12 Point Bolt Head | View on Amazon |
This table covers the Water Pump Stud kits.
ARP supplies the 3 Water Pump Stud Kit parts for the 2003 Avanti Ii.
Listed part numbers: ARP 1343201, ARP 4343202 and ARP 1343202.
Buying Cooling System Parts for a 2003 Avanti Ii
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 5.7L V8 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: Water Pump Gasket and Coolant / Antifreeze .
Frequently Asked Questions
How many cooling system parts fit the 2003 Avanti Ii?
Our catalog currently lists 39 cooling system parts for the 2003 Avanti Ii across 8 subcategories and 16 brands, covering the 5.7L V8 engine. Each part is matched to the engine(s) it fits.
What are the signs of cooling system problems on a 2003 Avanti Ii?
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 2003 Avanti Ii 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 2003 Avanti Ii?
Every part on this page is matched to the 5.7L V8 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 2003 Avanti Ii
Cooling System Parts for Other Avanti Ii 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.