2003 Buick Regal Cooling System Parts

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. Read more

16 Coolant / Antifreeze parts for the 2003 Buick Regal 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 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, VALVOLINE, PRESTONE, ACDELCO and 2 other brands supply 7 parts: built to original-equipment specification. A representative part number is ACDELCO 105027.

This table covers the bleeders used to purge air from the coolant circuit. Read more

One part is listed for the 2003 Buick Regal — DORMAN 902112.

This table covers the hard pipes and extra hoses in the coolant circuit. Read more

3 Coolant Hose / Pipe parts for the 2003 Buick Regal come from 2 brands — GM GENUINE and CONTINENTAL.

This group includes CONTINENTAL 63043, GM GENUINE 12565082 and GM GENUINE 24503423.

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. Read more

5 Coolant Hose / Pipe Seal parts are listed for the 2003 Buick Regal, from GM GENUINE, FEL-PRO and MAHLE / CLEVITE. GM GENUINE 1534066 carries the "Popular" badge.

This group includes GM GENUINE 1534066, FEL-PRO 36021 and GM GENUINE 24502846 and the remaining parts above.

This table covers the Coolant Hose Connector flanges. Read more

This group shows a single part: FOUR SEASONS 86500.

This table covers the Coolant Level sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

4 Coolant Level Sensor parts for the 2003 Buick Regal come from 3 brands — WALKER PRODUCTS, HOLSTEIN and STANDARD MOTOR PRODUCTS.

The Economy section: 1 option from HOLSTEIN. HOLSTEIN 2CTS0221 is listed in this group.

The Full Service Kit section lists 1 option from WALKER PRODUCTS — grouped under the catalog's "Full Service Kit" designation — the notes column spells out what sets them apart. WALKER PRODUCTS 21192002 is listed in this group.

2 further parts sit outside the graded sections, with the same engine-level match.

Part numbers include HOLSTEIN 2CTS0221, WALKER PRODUCTS 21192002 and STANDARD MOTOR PRODUCTS FLS24, among others listed above.

This table covers the overflow / expansion tanks that hold extra coolant. Read more

5 Coolant Reservoir parts are listed for the 2003 Buick Regal, from DORMAN, GM GENUINE, GPD and 2 other brands. DORMAN 603033 carries the "Popular" badge.

This group includes DORMAN 603033, GM GENUINE 10333858 and GPD 2411209 and the remaining parts above.

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. Read more

2 Coolant Reservoir Cap parts are listed for the 2003 Buick Regal, from DORMAN and MOTORAD.

Part numbers include DORMAN 82724 and MOTORAD T167.

This table covers the Coolant Reservoir retainers and clips. Read more

This group shows a single part: GM GENUINE 10427340.

This table covers the Cooling Fan control modules. Read more

US MOTOR WORKS supplies the 3 Cooling Fan Control Module parts for the 2003 Buick Regal.

Part numbers include US MOTOR WORKS 16749, US MOTOR WORKS 16789 and US MOTOR WORKS 16795.

This table covers the adapters used to pressure-test this cooling system. Read more

3 Cooling System Tester Adapter parts for the 2003 Buick Regal come from 3 brands — ACDELCO, GATES and MOTORAD.

Listed part numbers: ACDELCO 12A01, GATES 31413 and MOTORAD 3003.

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. Read more

9 Radiator parts for the 2003 Buick Regal come from 9 brands — FAMOUS BRAND, DENSO, KOYORAD and 6 other brands. The "Popular" part is DENSO 2219009.

The Economy section: 1 option from FAMOUS BRAND. FAMOUS BRAND 432302 is listed in this group.

Standard Replacement: 8 parts, from DENSO, KOYORAD, AGILITY and 5 other brands. A representative part number is DENSO 2219009.

Listed part numbers: DENSO 2219009, FAMOUS BRAND 432302 and KOYORAD A2343, plus the other parts above.

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. Read more

8 Radiator Cap parts for the 2003 Buick Regal come from 5 brands — MOTORAD, CALORSTAT, GATES and 2 other brands. The "Popular" part is MOTORAD ST16V.

In the Locking Replacement grade, CALORSTAT, MOTORAD and GATES supply 4 parts: grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. A representative part number is MOTORAD ST16V.

Standard Replacement: 4 parts, from GATES, ACDELCO, MOTORAD and 1 other brand. A representative part number is GATES 31523.

This group includes MOTORAD ST16V, CALORSTAT RC0214 and CALORSTAT RC0217 and the remaining parts above.

This table covers the petcocks used to drain the radiator. Read more

One part is listed for the 2003 Buick Regal — DORMAN 61136.

This table covers the fan assemblies (and clutches, where listed) that pull air through the radiator. Read more

7 Radiator Fan Assembly parts are listed for the 2003 Buick Regal, from DORMAN, GPD, TECHPRO and 4 other brands. DORMAN 620613 carries the "Popular" badge.

Economy: 3 parts, from DORMAN, GPD and TECHPRO. A representative part number is DORMAN 620613.

The Standard Replacement section: 4 options from AGILITY, FOUR SEASONS, UAC and 1 other brand. AGILITY 6012107 is listed in this group.

This group includes DORMAN 620613, GPD 2811514 and TECHPRO GM3115129 and the remaining parts above.

This table covers the Radiator Fan motors. Typical signs include no motion, a squeal, or a motor that only runs on one speed. Confirm power, ground and the control module before replacing the motor. Read more

5 Radiator Fan Motor parts for the 2003 Buick Regal come from 3 brands — FOUR SEASONS, VDO / CONTINENTAL and TYC. The "Popular" part is FOUR SEASONS 35656.

Part numbers include FOUR SEASONS 35656, FOUR SEASONS 35389 and TYC 630070, among others listed above.

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. Read more

8 Radiator Hose parts are listed for the 2003 Buick Regal, from GATES, ACDELCO, CONTINENTAL and 1 other brand. GATES 22344 carries the "Popular" badge.

This group includes GATES 22344, GATES 22373 and ACDELCO 26346X and the remaining parts above.

This table covers the Radiator Upper Air Baffle retainers and clips. Read more

One part is listed for the 2003 Buick Regal — DORMAN 45814.

This table covers the Shroud Trim retainers and clips. Read more

This group shows a single part: DORMAN 961364.

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. Read more

22 Temperature Sender / Sensor parts for the 2003 Buick Regal come from 17 brands — STANDARD MOTOR PRODUCTS, NTK, WALKER PRODUCTS and 14 other brands. The "Popular" part is NTK EF0008.

The Economy section: 8 options from NTK, STANDARD MOTOR PRODUCTS, GPD and 5 other brands. NTK EF0008 is listed in this group.

The Full Service Kit section: 1 option from WALKER PRODUCTS. WALKER PRODUCTS 21191012 is listed in this group.

Standard Replacement: 13 parts, from STANDARD MOTOR PRODUCTS, WELLS, ACDELCO and 8 other brands. A representative part number is ACDELCO 1551107.

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. Read more

12 Thermostat parts are listed for the 2003 Buick Regal, from MOTORAD, GATES, GM GENUINE and 2 other brands. MOTORAD 5239192 carries the "Popular" badge.

The Heavy Duty section lists 2 options from MOTORAD — rated for severe service. MOTORAD 5239192 is listed in this group.

The Premium section: 3 options from MOTORAD. MOTORAD 7239192 is listed in this group.

The Standard Replacement section: 7 options from MOTORAD, GATES, GM GENUINE and 2 other brands. GATES 33429 is listed in this group.

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. Read more

10 Thermostat / Thermostat Housing / Water Outlet Seal parts for the 2003 Buick Regal come from 7 brands — MAHLE / CLEVITE, MOTORAD, VICTOR REINZ and 4 other brands. The "Popular" part is FEL-PRO 35666.