1991 Buick Riviera 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

17 Coolant / Antifreeze parts for the 1991 Buick Riviera come from 4 brands — PEAK, PRESTONE, FVP 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, PRESTONE, PEAK 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, PEAK, FVP, PRESTONE and 1 other brand supply 8 parts: built to original-equipment specification. A representative part number is FVP DEX5050GAL.

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

4 Coolant Hose / Pipe parts for the 1991 Buick Riviera come from 4 brands — ACDELCO, CONTINENTAL, DAYCO and 1 other brand.

Part numbers include ACDELCO 14108S, CONTINENTAL 64288 and DAYCO 71624, among others listed above.

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

One part is listed for the 1991 Buick Riviera — TECHPRO GM3014108.

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

One part is listed for the 1991 Buick Riviera — DORMAN 54217.

This table covers the Cooling Fan control modules. Read more

US MOTOR WORKS supplies the 3 Cooling Fan Control Module parts for the 1991 Buick Riviera.

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 1991 Buick Riviera come from 3 brands — ACDELCO, GATES and MOTORAD.

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

This table covers the Hose clamps. Read more

This group shows a single part: GM GENUINE 11570383.

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

6 Radiator parts for the 1991 Buick Riviera come from 6 brands — GPD, SPECTRA PREMIUM, TYC and 3 other brands. The "Popular" part is SPECTRA PREMIUM CU1202.

The Economy section: 1 option from GPD. GPD 856C is listed in this group.

Standard Replacement: 5 parts, from SPECTRA PREMIUM, TYC, AGILITY and 2 other brands. A representative part number is SPECTRA PREMIUM CU1202.

This group includes SPECTRA PREMIUM CU1202, GPD 856C and TYC 1204 and the remaining 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 1991 Buick Riviera come from 5 brands — CALORSTAT, GATES, MOTORAD and 2 other brands. The "Popular" part is ACDELCO RC27.

In the Locking Replacement grade, CALORSTAT, GATES and MOTORAD 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 CALORSTAT RC0214.

Standard Replacement: 4 parts, from ACDELCO, GATES, MOTORAD and 1 other brand. A representative part number is ACDELCO RC27.

Listed part numbers: ACDELCO RC27, CALORSTAT RC0214 and CALORSTAT RC0217, plus the other parts above.

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

One part is listed for the 1991 Buick Riviera — DORMAN 490232.

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

6 Radiator Fan Motor parts for the 1991 Buick Riviera come from 3 brands — VDO / CONTINENTAL, FOUR SEASONS and GPD. The "Popular" part is FOUR SEASONS 35656.

Listed part numbers: FOUR SEASONS 35656, VDO / CONTINENTAL PM517 and FOUR SEASONS 35693, plus the other parts 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

10 Radiator Hose parts are listed for the 1991 Buick Riviera, from DAYCO, GATES, CONTINENTAL and 1 other brand. DAYCO 71178 carries the "Popular" badge.

Economy: 5 parts, from DAYCO, ACDELCO, CONTINENTAL and 1 other brand. A representative part number is ACDELCO 31612.

The Standard Replacement section: 5 options from DAYCO, GATES and CONTINENTAL. DAYCO 71178 is listed in this group.

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

One part is listed for the 1991 Buick Riviera — 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

19 Temperature Sender / Sensor parts for the 1991 Buick Riviera come from 15 brands — STANDARD MOTOR PRODUCTS, NTK, WELLS and 12 other brands. The "Popular" part is NTK EF0008.

The Economy section: 7 options from NTK, STANDARD MOTOR PRODUCTS, GPD and 4 other brands. NTK EF0008 is listed in this group.

Standard Replacement: 12 parts, from STANDARD MOTOR PRODUCTS, WELLS, ACDELCO and 7 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

16 Thermostat parts are listed for the 1991 Buick Riviera, from MOTORAD, GATES, CALORSTAT and 1 other brand. GATES 33429 carries the "Popular" badge.

The Heavy Duty section lists 2 options from MOTORAD — rated for severe service. MOTORAD 5203180 is listed in this group.

In the Performance grade, MOTORAD supplies 2 parts: engineered beyond original-equipment specification. A representative part number is MOTORAD 2003195.

The Premium section: 4 options from MOTORAD. MOTORAD 7203192 is listed in this group.

The Standard Replacement section: 8 options from MOTORAD, GATES, CALORSTAT and 1 other brand. 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

17 Thermostat / Thermostat Housing / Water Outlet Seal parts for the 1991 Buick Riviera come from 9 brands — ROL GASKETS, FEL-PRO, MOTORAD and 6 other brands. The "Popular" part is FEL-PRO 35534.

This table covers the housings and outlets the thermostat sits in. Read more

5 Thermostat Housing / Water Outlet parts are listed for the 1991 Buick Riviera, from DORMAN, FAMOUS BRAND, GPD and 2 other brands. FOUR SEASONS 85105 carries the "Popular" badge.

Economy: 3 parts, from DORMAN, FAMOUS BRAND and GPD. A representative part number is DORMAN 9022053.

The Standard Replacement section: 2 options from FOUR SEASONS and MOTORAD. FOUR SEASONS 85105 is listed in this group.

Listed part numbers: FOUR SEASONS 85105, DORMAN 9022053 and GPD 8241384, plus the other parts above.

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. Read more

10 Water Pump parts are listed for the 1991 Buick Riviera, from WJB / INMOTION PARTS, FVP, SKP and 6 other brands. ACDELCO 252694 carries the "Popular" badge.

Economy: 5 parts, from WJB / INMOTION PARTS, FVP, SKP and 1 other brand. A representative part number is FVP US5050.

The Standard Replacement section: 5 options from ACDELCO, GM GENUINE, DAYCO and 2 other brands. ACDELCO 252694 is listed in this group.

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. Read more

4 Water Pump Gasket parts for the 1991 Buick Riviera come from 4 brands — APEX, FEL-PRO, MAHLE / CLEVITE and 1 other brand.

Listed part numbers: APEX AWP3003, FEL-PRO 35351 and MAHLE / CLEVITE K30793, plus the other parts above.

This table covers the Water Pump pulleys. Typical signs include a growl or chirp that follows engine speed, or a pulley that will not spin freely by hand. Spin each pulley with the belt off. Roughness or play means replace it with the belt. Read more

This group shows a single part: DORMAN 300934.

This table covers the Water Pump Stud kits. Read more

One part is listed for the 1991 Buick Riviera — DORMAN 902803.