The 2018 Ram Promaster Rapid has 29 cooling system parts with verified fitment on this page — 7 part types and 12 brands, covering the 1.4L L4 engine. Each part includes a manufacturer part number and application notes.
The cooling system system on the 2018 Ram Promaster Rapid keeps operating temperature in the narrow band the engine was designed for, from radiator and water pump to thermostat and hoses. The largest groups are Coolant / Antifreeze (17 parts), Water Pump (4 parts) and Thermostat (3 parts). The other 4 part types cover the remaining 5 parts.
Every part on this page is matched to the 1.4L L4 — the only engine offered in the 2018 Ram Promaster Rapid.
The most listed brands for 2018 Ram Promaster Rapid cooling system parts are PRESTONE (7 parts), PEAK (4 parts) and FOUR SEASONS (4 parts), plus 9 more brands. Quality grades include Standard Replacement, Economy and Premium.
4 parts on this 2018 Ram Promaster Rapid page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including FVP MV5050GAL (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 | AF3055 | 🇲🇽 MX | Prime YellowAll Vehicles | View on Amazon |
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP Popular | MV5050GAL | 🇲🇽 MX | Extended LifeAll Makes / All Models | View on Amazon |
| PEAK | BQA1GAL | 🇲🇽 MX | Blue Mountain Long LifeAll Vehicle | View on Amazon |
| PRESTONE | AF3100 | 🇲🇽 MX | Prime Yellow - All VehiclesExtended Life | View on Amazon |
| VALVOLINE | 719009 | 🇲🇽 MX | Multi-Vehicle Yellow1 Gallon | View on Amazon |
Heavy Duty
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE | AFC12100 | 🇲🇽 MX | Command Nitrite Free Extended Life CoolantYellow Nitrite Free OAT | View on Amazon |
| VALVOLINE | 846439 | 🇲🇽 MX | HD Nitrite Free Extended Life Yellow1 Gallon | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Popular | AF2100 | 🇲🇽 MX | All Vehicles10yr/300k mi | View on Amazon |
| PEAK | PKP1GAL | 🇲🇽 MX | All Vehicles Antifreeze1 Gallon | View on Amazon |
| PEAK | PXA1GAL | 🇲🇽 MX | Global Lifetime1 Gallon | View on Amazon |
| PRESTONE | AFMAX | 🇲🇽 MX | Max Universal1 Gallon | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Popular | 105027 | 🇲🇽 MX | DEX-Cool Extended LifeDexcool (with DE-Ionized Water) (with Bitterant) 1 Gallon | View on Amazon |
| VALVOLINE Popular | ZXEL1 | 🇲🇽 MX | Dex-Cool Orange1 Gallon | View on Amazon |
| AISIN | ACD007 | 🇲🇽 MX | PurpleOAT | View on Amazon |
| PEAK | NAP1GAL | 🇲🇽 MX | OET North American Extended Life Purple1 Gallon | View on Amazon |
| PRESTONE | AF3400 | 🇲🇽 MX | Prime OrangeOrange Compatible | View on Amazon |
| PRESTONE | AF850 | 🇲🇽 MX | DEX-Cool Extended Life1 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 2018 Ram Promaster Rapid come from 6 brands — PRESTONE, PEAK, VALVOLINE and 3 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, PRESTONE and VALVOLINE supply 2 parts: 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, PRESTONE, ACDELCO, VALVOLINE and 2 other brands supply 6 parts: built to original-equipment specification. A representative part number is ACDELCO 105027.
Coolant Reservoir Cap
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 54375 | 🇲🇽 MX | View on Amazon |
This table covers the caps on the overflow / expansion tank. 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.
One part is listed for the 2018 Ram Promaster Rapid — DORMAN 54375.
Radiator Fan Assembly
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS | 75928 | 🇲🇽 MX | Style: Radiator Fan, Condenser Fan | View on Amazon |
| FOUR SEASONS | 75929 | 🇲🇽 MX | with A/C | View on Amazon |
This table covers the fan assemblies (and clutches, where listed) that pull air through the radiator.
FOUR SEASONS supplies both parts for the 2018 Ram Promaster Rapid.
This group includes FOUR SEASONS 75928 and FOUR SEASONS 75929.
Temperature Sender / Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD | 1712909 | 🇲🇽 MX | 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: GPD 1712909.
Thermostat
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD | 7908203 | 🇲🇽 MX | Fail-SafeAssembly | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS | 85976 | 🇲🇽 MX | Includes Housing | View on Amazon |
| MOTORAD | 908203 | 🇲🇽 MX | Includes Housing, Seal | 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.
3 Thermostat parts are listed for the 2018 Ram Promaster Rapid, from MOTORAD and FOUR SEASONS.
The Premium section: 1 option from MOTORAD. MOTORAD 7908203 is listed in this group.
The Standard Replacement section: 2 options from FOUR SEASONS and MOTORAD. FOUR SEASONS 85976 is listed in this group.
Part numbers include MOTORAD 7908203, FOUR SEASONS 85976 and MOTORAD 908203.
Thermostat Housing / Water Outlet
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS | 85997 | 🇲🇽 MX | Coolant Tube | View on Amazon |
This table covers the housings and outlets the thermostat sits in.
One part is listed for the 2018 Ram Promaster Rapid — FOUR SEASONS 85997.
Water Pump
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP | US8136 | 🇲🇽 MX | View on Amazon | |
| US MOTOR WORKS | US8136 | 🇲🇽 MX | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP | 1204480 | 🇲🇽 MX | View on Amazon | |
| GMB | 1204480 | 🇲🇽 MX | 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 2018 Ram Promaster Rapid, from FVP, US MOTOR WORKS and GMB.
Economy: 2 parts, from FVP and US MOTOR WORKS. A representative part number is FVP US8136.
The Standard Replacement section: 2 options from FVP and GMB. FVP 1204480 is listed in this group.
Part numbers include FVP US8136 and FVP 1204480, among others listed above.
Buying Cooling System Parts for a 2018 Ram Promaster Rapid
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 1.4L 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 Water Pump .
Frequently Asked Questions
How many cooling system parts fit the 2018 Ram Promaster Rapid?
Our catalog currently lists 29 cooling system parts for the 2018 Ram Promaster Rapid across 7 subcategories and 12 brands, covering the 1.4L L4 engine. Each part is matched to the engine(s) it fits.
What are the signs of cooling system problems on a 2018 Ram Promaster Rapid?
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 2018 Ram Promaster Rapid 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 2018 Ram Promaster Rapid?
Every part on this page is matched to the 1.4L 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 2018 Ram Promaster Rapid
Cooling System Parts for Other Ram Promaster Rapid Years
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