BMW 3-Series Radiator Caps
- Gates®Replacement Radiator CapReplacement Radiator Cap by Gates®. If you want to keep your vehicle safe on the road for many years to come, go with this Gates product. Developed with the utmost attention to detail and manufactured from the highest quality materials,...Wide range of applications covering all makes and modelsManufactured to meet or exceed OEM specifications in function, form and fit$4.50 - $27.98
- MotoRad®Safety Lever Radiator CapSafety Lever Radiator Cap by MotoRad®. MotoRad radiator caps are designed and manufactured to offer precise control for the automotive cooling system.Offer precise pressure controlEnsure the proper fit$2.77 - $10.27
- Genuine®Engine Coolant Expansion Tank CapEngine Coolant Expansion Tank Cap by Genuine®. If your engine cooling system is in need of repair, don't compromise the performance and safety of your car with suspect, off-brand replacement parts from the local auto parts chain store....Designed to restore your vehicle’s engine cooling systemGenuine OE replacement parts from the OE manufacturer$4.65 - $65.31
- MotoRad®Engine Coolant Recovery Tank CapEngine Coolant Recovery Tank Cap by MotoRad®. MotoRad radiator caps are designed and manufactured to offer precise control for the automotive cooling system.Made to keep your vehicle's engine running coolDesigned to maintain proper cooling level and prevent overheating$1.85 - $74.91
- Gates®Safety Release Radiator CapSafety Release Radiator Cap by Gates®. If you want to keep your vehicle safe on the road for many years to come, go with this Gates product. Developed with the utmost attention to detail and manufactured from the highest quality...Great design and functionMade from sturdy materials$3.46 - $9.13
- MotoRad®Standard Radiator CapStandard Radiator Cap by MotoRad®. MotoRad radiator caps are designed and manufactured to offer precise control for the automotive cooling system. This top-grade product is expertly made in compliance with stringent industry standards...Offer precise pressure controlEnsure the proper fit$3.03 - $7.05
- Genuine®Radiator CapRadiator Cap by Genuine®. If your engine cooling system is in need of repair, don't compromise the performance and safety of your car with suspect, off-brand replacement parts from the local auto parts chain store. On our website you'll...Designed to restore your vehicle’s engine cooling systemGenuine OE replacement parts from the OE manufacturer$21.39 - $111.40
- iD Select®Engine Coolant Radiator CapEngine Coolant Radiator Cap by iD Select®. Swap out your worn-out or malfunctioning part with this top-notch product from iD Select. It’s built to OEM specifications to offer the same fit, form, and function as your factory...Direct OEM replacement for your malfunctioning partMade to deliver the ultimate in quality, reliability, and value$2.79 - $13.28
- iD Select®Safety Lever Engine Coolant Radiator CapSafety Lever Engine Coolant Radiator Cap by iD Select®. Swap out your worn-out or malfunctioning part with this top-notch product from iD Select. It’s built to OEM specifications to offer the same fit, form, and function as your...Direct OEM replacement for your malfunctioning partMade to deliver the ultimate in quality, reliability, and value$4.35 - $8.80
- ACDelco®Professional™ Radiator CapProfessional™ Radiator Cap by ACDelco®. With a full range of part numbers to fit most GM vehicles, ACDelco Professional™ Radiator Caps offer customers an ideal replacement for their worn OE part. Built to their demanding...Lets you release the pressure prior to taking off the capDesigned to be OE-like$3.86 - $13.20
- Vaico®Engine Coolant Expansion Tank CapEngine Coolant Expansion Tank Cap by Vaico®. Keep your vehicle’s heart under the hood running in tip-top condition with this premium Vaico engine cooling product. It’s designed to help your engine work in a reliable and efficiency...Sensible alternative to your OEM engine cooling partDesigned to keep your engine operating at proper temperatures$5.02 - $26.02
- Stant®Radiator CapRadiator Cap by Stant®. Test your radiator cap whenever you service the cooling system. If you’re in need of a replacement you can prevent engine overheating and expensive damage with a new Stant radiator cap. They’re made...Meets Original Equipment specificationsThe SWIV-EL design allows the cap to be installed and removed much easier than conventional radiator caps$2.81 - $17.25
- Febi®Engine Coolant Expansion Tank CapEngine Coolant Expansion Tank Cap by Febi®. This Febi product is designed to help you restore your engine cooling system to its mint condition, so your motor can run within the proper temperature window required for its safe and...Designed to replace your factory productMade from the same grade material as your OE part$4.32 - $25.90
- Reutter®Expansion Tank CapExpansion Tank Cap by Reutter®. Has your temperature gauge needle been creeping up? Are you seeing green puddles on the ground under your vehicle? If so, you may need cooling system repairs, which should not be put off, because...Made to keep your vehicle's engine running coolDesigned to maintain proper cooling level and prevent overheating$9.64 - $26.46
- Genuine®Engine Coolant Radiator Cap SealEngine Coolant Radiator Cap Seal by Genuine®. If your engine cooling system is in need of repair, don’t compromise the performance and safety of your car with suspect, off-brand replacement parts from the local auto parts chain...Designed to restore your vehicle’s engine cooling systemGenuine OE replacement parts from the OE manufacturer$8.26 - $8.28
- URO Parts®Engine Coolant Reservoir CapEngine Coolant Reservoir Cap by URO Parts®. This superior part by URO is a great alternative solution to the costly factory equipment that will help you restore smooth and efficient operation of your vehicle. Thoroughly designed and...Designed to replace your worn out factory cooling partOptimizes engine cooling performance$2.28 - $20.16
- Rein®Coolant Recovery Tank CapCoolant Recovery Tank Cap by Rein®. Rein First Aid coolant, oil, and fuel caps are designed to maintain the correct pressure, making sure the vehicle operates smoothly and that no check engine lights illuminate.Made to keep your vehicle's engine running coolDesigned to maintain proper cooling level and prevent overheating$7.82 - $27.75
- Rein®Engine Coolant Reservoir CapEngine Coolant Reservoir Cap by Rein®. Improve your vehicle's engine efficiency and extend its life expectancy with Rein Automotive parts that are built with premium quality fit, form, and function. All parts are manufactured in an...Made to keep your vehicle's engine running coolDesigned to maintain proper cooling level and prevent overheating$6.56 - $35.10
- Vaico®Reservoir CapReservoir Cap by Vaico®. Increase the life of your vehicle's engine by keeping your cooling system in top condition. Replace your faulty engine cooling component with this highly efficient replacement product and be sure the heart of...Sensible alternative to your OEM engine cooling partDesigned to keep your engine operating at proper temperatures$9.08 - $26.39
- Original Equipment®Engine Coolant Reservoir CapEngine Coolant Reservoir Cap by Original Equipment®. Looking for high-quality replacement parts to restore the performance of your vehicle? Then Original Equipment automotive parts are for you. They are manufactured from the finest...Perfect replacement for your damaged or worn out original partMade using high-grade materials for long-lasting dependability$12.16 - $27.50
- Stant®Engine Coolant Reservoir CapEngine Coolant Reservoir Cap by Stant®. Test your reservoir cap whenever you service the cooling system. If you’re in need of a replacement you can prevent engine overheating and expensive damage with a new Stant reservoir cap....Meets Original Equipment specificationsMade from premium materials$3.93 - $15.24
- CRP®Engine Coolant Reservoir CapEngine Coolant Reservoir Cap by CRP®. Engineered to meet the demanding OE standards set by many of the world's leading automobile manufacturers. That's why you'll find them on some of the world's finest automobiles.Made to keep your vehicle's engine running coolDesigned to maintain proper cooling level and prevent overheating$7.80 - $26.05
- Behr®Engine Coolant Reservoir CapEngine Coolant Reservoir Cap by Behr®. Increase the life of your vehicle's engine by keeping your cooling system in top condition. Replace your faulty engine cooling component with this highly efficient replacement product and be sure...Made to keep your vehicle's engine running coolDesigned to maintain proper cooling level and prevent overheating$11.49 - $31.80
- SKP®Engine Coolant Radiator CapEngine Coolant Radiator Cap by SKP®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from industry-leading...High quality at an affordable priceExpertly made from premium materials$1.93 - $4.14
- BMW OEEngine Coolant Reservoir Cap (17135A1BD89)Engine Coolant Reservoir Cap (17135A1BD89) by BMW OE. Choose genuine OE parts to restore the distinctive appearance and performance of your BMW. Meticulously crafted with German ingenuity, innovation, and attention to detail, each part...OE part manufactured to provide authentic quality, look, and functionDesigned to easily restore your BMW’s original condition$36.23
- BMW OEEngine Coolant Reservoir Cap (17117639021)Engine Coolant Reservoir Cap (17117639021) by BMW OE. Choose genuine OE parts to restore the distinctive appearance and performance of your BMW. Meticulously crafted with German ingenuity, innovation, and attention to detail, each part...OE part manufactured to provide authentic quality, look, and functionDesigned to easily restore your BMW’s original condition$37.29
- BMW OEEngine Coolant Reservoir Cap (17117639020)Engine Coolant Reservoir Cap (17117639020) by BMW OE. Choose genuine OE parts to restore the distinctive appearance and performance of your BMW. Meticulously crafted with German ingenuity, innovation, and attention to detail, each part...OE part manufactured to provide authentic quality, look, and functionDesigned to easily restore your BMW’s original condition$36.20
- Gates®Engine Coolant Replacement Radiator Cap (31542)Engine Coolant Replacement Radiator Cap (31542) by Gates®. Pressure: 18 psi. Type: Closed System. Shell Diameter: 2.51". Filler Neck Outside Diameter: 1.92". Cap Depth: 1.64". If you want to keep your vehicle safe on the road for many...Wide range of applications covering all makes and modelsManufactured to meet or exceed OEM specifications in function, form and fit$13.43
- Gates®Engine Coolant Replacement Radiator Cap (31528)Engine Coolant Replacement Radiator Cap (31528) by Gates®. Pressure: 16 psi. Type: Optional System. Shell Diameter: 2.33". Filler Neck Outside Diameter: 2.13". Cap Depth: 1.25". Filler Neck Inside Diameter: 1.61". Filler Neck Depth:...Wide range of applications covering all makes and modelsManufactured to meet or exceed OEM specifications in function, form and fit$5.34
- Gates®Engine Coolant Replacement Radiator Cap (31522)Engine Coolant Replacement Radiator Cap (31522) by Gates®. Pressure: 20 psi. Type: Optional System. Shell Diameter: 2.33". Filler Neck Outside Diameter: 2.13". Cap Depth: 1.25". Filler Neck Inside Diameter: 1.61". Filler Neck Depth:...Wide range of applications covering all makes and modelsManufactured to meet or exceed OEM specifications in function, form and fit$5.34
While operating, the engine produces a great amount of heat which can be destructive for the engine itself and other underhood components. For this reason, vehicles are equipped with radiators that help to cool the engine down. Engine coolant found inside the radiator should operate under the required amount of pressure. It is the task of a radiator cap to act as a pressure valve. Another function of a radiator cap is to direct some hot coolant to the overflow reservoir and once the acceptable levels of pressure have been reached, to draw it back, thus preventing extra pressure buildup in the system.
The BMW 3-Series manufactured in the 80s had problems with excessive pressure in the cooling system. The pressure was so intense that it could damage the heater core and let hot coolant in the cabin, splashing it right on the driver's feet. A different radiator cap and pressure relief valve solved the problem in recalled vehicles. Coolant leak (a problem area fairly common for 3ers) is the first sign of a failing radiator cap. To make sure that it is the cap’s failure, check the pressure inside the radiator – if it is different from normal, get ready to replace the cap. Here you can find top-notch BMW 3-Series replacement radiator caps to restore the cooling system.