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Rein Engine Cooling Components

Keeping your vehicle cool is essential for optimum engine performance. You’ll find all the engine cooling components you need here at Sixity Auto. From drive belts to radiator parts, our inventory has everything you need at affordable prices. And with our US warehouse network, your order gets delivered fast, often at no cost to you. So, whether you’re looking for a serpentine belt, water pumps, or other car cooling system parts, you’ll find what you need below. Just browse our selection or use our vehicle search tool to find the parts you need.

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  1. Rein Engine Coolant Hose
    Rein Lower Tank To Connect Coolant Hose for 2000-2006 Volkswagen Golf 1.8L L4
    Special Price $17.57 Regular Price $24.99
    Rein Auto Parts
  2. Rein Engine Water Pump
    Rein Water Pump for 2009-2016 Audi A4 Quattro 2.0L L4
    Special Price $306.18 Regular Price $436.99
    Rein Auto Parts
  3. Rein Engine Coolant Hose
    Rein Tank To Connector Coolant Hose for 2011-2015 Mini Cooper 1.6L L4
    Special Price $37.50 Regular Price $53.99
    Rein Auto Parts
  4. Rein Engine Coolant Reservoir Kit
    Rein EPK0028 Coolant Reservoir Kit
    Special Price $76.48 Regular Price $108.99
    Rein Auto Parts
  5. Rein Engine Water Pump Installation Kit
    Rein Water Pump Install Kit for 2010-2020 Jaguar XF 3.0L 5.0L V6 V8
    Special Price $229.54 Regular Price $327.99
    Rein Auto Parts
  6. Rein Engine Coolant Hose
    Rein Pump To Pipe Coolant Hose for 1985-1993 Volkswagen Jetta 1.6L 1.8L 2.0L L4
    Special Price $10.56 Regular Price $14.99
    Rein Auto Parts
  7. Rein Engine Water Pump Plug
    Rein Engine Water Pump Plug for 2010-2018 BMW X5 4.4L V8
    Special Price $15.63 Regular Price $21.99
    Rein Auto Parts
  8. Rein Radiator Fitting Plug
    Rein Radiator Fitting Plug for 2008-2018 BMW X6 4.4L V8
    Special Price $15.63 Regular Price $21.99
    Rein Auto Parts
  9. Rein Engine Coolant Reservoir Cap
    Rein Coolant Reservoir Cap for 1999-2013 Porsche 911 3.4L 3.6L 3.8L 4.0L H6
    Special Price $21.66 Regular Price $30.99
    Rein Auto Parts
  10. Rein Engine Coolant Reservoir Cap
    Rein Coolant Reservoir Cap for 2016-2019 Mercedes-Benz GLE63 AMG S 5.5L V8
    Special Price $30.41 Regular Price $42.99
    Rein Auto Parts
  11. Rein Engine Coolant Thermostat
    Rein Coolant Thermostat for 2010-2014 Volkswagen GTI 2.0L L4
    Special Price $33.23 Regular Price $46.99
    Rein Auto Parts
  12. Rein Engine Coolant Pipe
    Rein Coolant Pipe for 2009-2017 Volkswagen Tiguan 2.0L L4
    Special Price $35.78 Regular Price $50.99
    Rein Auto Parts
  13. Rein Engine Coolant Reservoir Kit
    Rein Coolant Reservoir Kit for 2006-2009 Volkswagen Rabbit 2.5L L5
    Special Price $37.35 Regular Price $52.99
    Rein Auto Parts
  14. Rein Radiator Coolant Hose
    Rein Upper Radiator Coolant Hose for 2007-2013 BMW 335i 3.0L L6
    Special Price $39.80 Regular Price $56.99
    Rein Auto Parts
  15. Rein Engine Coolant Hose
    Rein Tank To Upper Hose Coolant Hose for 2007-2010 BMW 335i 3.0L L6
    Special Price $40.99 Regular Price $58.99
    Rein Auto Parts
    Out of stock
  16. Rein Engine Coolant Hose
    Rein Expansion Tank Inlet Coolant Hose for 2010-2013 Ford Transit Connect 2.0L L4
    Special Price $48.32 Regular Price $68.99
    Rein Auto Parts
  17. Rein Engine Coolant Pipe
    Rein Engine To Heater Coolant Pipe for 2001-2005 BMW 325i 2.5L L6
    Special Price $49.97 Regular Price $70.99
    Rein Auto Parts
  18. Rein Engine Coolant Reservoir Kit
    Rein Coolant Reservoir Kit for 2013-2016 Audi A4 allroad 2.0L L4
    Special Price $58.53 Regular Price $83.99
    Rein Auto Parts
  19. Rein Engine Coolant Reservoir Kit
    Rein Coolant Reservoir Kit for 2012-2015 BMW X1 2.0L L4
    Special Price $99.37 Regular Price $141.99
    Rein Auto Parts
  20. Rein Engine Water Pump Installation Kit
    Rein Water Pump Install Kit for 2018-2020 Land Rover Range Rover Velar 3.0L 5.0L V6 V8
    Special Price $229.54 Regular Price $327.99
    Rein Auto Parts
  21. Rein Engine Water Pump
    Rein Water Pump for 2009-2016 Audi A4 Quattro 2.0L L4
    Special Price $266.93 Regular Price $380.99
    Rein Auto Parts
  22. Rein Engine Coolant Pipe
    Rein Cooler To Thermostat Coolant Pipe for 2015-2024 Audi A3 1.8L 2.0L L4
    Special Price $10.99 Regular Price $15.99
    Rein Auto Parts
    Out of stock
  23. Rein Engine Coolant Pipe
    Rein Engine To Heater Coolant Pipe for 2001-2006 BMW 325Ci 2.5L L6
    Special Price $50.99 Regular Price $72.99
    Rein Auto Parts
  24. Rein Engine Coolant Pipe
    Rein Cooler To Thermostat Coolant Pipe for 2008-2010 Volkswagen Passat 2.0L L4
    Special Price $10.76 Regular Price $14.99
    Rein Auto Parts
  25. Rein Belt Tensioner Damper Bolt
    2 pc Rein Belt Tensioner Damper Bolts for 2000-2006 Volkswagen Golf 1.8L L4
    Special Price $11.28 Regular Price $15.99
    Rein Auto Parts
  26. Rein Engine Coolant Hose
    Rein Thermostat To Pipe Coolant Hose for 2005-2008 Audi A6 Quattro 3.2L V6
    Special Price $14.60 Regular Price $20.99
    Rein Auto Parts
  27. Rein Radiator Coolant Hose
    Rein CHR0021P Radiator Coolant Hose
    Special Price $23.61 Regular Price $33.99
    Rein Auto Parts
  28. Rein Engine Coolant Hose
    Rein Thermostat To Head Coolant Hose for 2012-2016 BMW 528i 2.0L L4
    Special Price $26.27 Regular Price $37.99
    Rein Auto Parts
  29. Rein Engine Coolant Reservoir Cap
    Rein Coolant Reservoir Cap for 2017-2019 Mercedes-Benz GLS550 4.7L V8
    Special Price $29.80 Regular Price $42.99
    Rein Auto Parts
  30. Rein Engine Water Pump
    Rein Water Pump for 2008-2013 Audi A3 2.0L L4
    Special Price $306.18 Regular Price $436.99
    Rein Auto Parts
  31. Rein Engine Water Pump Bolt
    Rein Engine Water Pump Bolt for 2007-2010 Volkswagen Golf City 2.0L L4
    Special Price $9.32 Regular Price $12.99
    Rein Auto Parts
  32. Rein Engine Coolant Thermostat Bolt
    Rein Engine Coolant Thermostat Bolt for 2001-2009 Audi A4 Quattro 1.8L 2.0L L4
    Special Price $9.32 Regular Price $12.99
    Rein Auto Parts
  33. Rein Engine Water Pump Bolt
    Rein Engine Water Pump Bolt for 2006-2013 Audi A3 2.0L L4
    Special Price $9.32 Regular Price $12.99
    Rein Auto Parts
  34. Rein Engine Water Pump Bolt
    Rein Engine Water Pump Bolt for 2000-2013 Audi TT 1.8L 2.0L L4
    Special Price $9.32 Regular Price $12.99
    Rein Auto Parts
  35. Rein Engine Water Pump Bolt
    Rein Engine Water Pump Bolt for 2006-2008 Audi A3 Quattro 2.0L L4
    Special Price $9.32 Regular Price $12.99
    Rein Auto Parts
  36. Rein Belt Tensioner Damper Bolt
    2 pc Rein Belt Tensioner Damper Bolts for 2001-2006 Audi A4 1.8L L4
    Special Price $11.28 Regular Price $15.99
    Rein Auto Parts
  37. Rein Belt Tensioner Damper Bolt
    2 pc Rein Belt Tensioner Damper Bolts for 2000-2005 Volkswagen Passat 1.8L L4
    Special Price $11.51 Regular Price $15.99
    Rein Auto Parts
  38. Rein Radiator Mount Bushing
    2 pc Rein Lower Radiator Mount Bushings for 2003-2011 Saab 9-3 2.0L 2.8L L4 V6
    Special Price $12.08 Regular Price $16.99
    Rein Auto Parts
  39. Rein Engine Water Pump Bolt Kit
    Rein Water Pump Bolt Kit for 2008-2010 BMW 535i 3.0L L6
    Special Price $12.62 Regular Price $17.99
    Rein Auto Parts
  40. Rein Engine Water Pump Bolt Kit
    Rein Water Pump Bolt Kit for 2009-2010 BMW 535i xDrive 3.0L L6
    Special Price $12.62 Regular Price $17.99
    Rein Auto Parts
  41. Rein Accessory Drive Belt Tensioner Bolt
    3 pc Rein Drive Belt Tensioner Bolts for 2009-2014 Audi TTS Quattro 2.0L L4
    Special Price $13.12 Regular Price $18.99
    Rein Auto Parts
  42. Rein Accessory Drive Belt Tensioner Bolt
    3 pc Rein Drive Belt Tensioner Bolts for 2007-2009 Volkswagen Eos 2.0L L4
    Special Price $13.12 Regular Price $18.99
    Rein Auto Parts
  43. Rein Engine Coolant Hose
    Rein CHE0496 Coolant Hose
    Special Price $13.12 Regular Price $18.99
    Rein Auto Parts
  44. Rein Accessory Drive Belt Tensioner Bolt
    3 pc Rein Drive Belt Tensioner Bolts for 2006-2008 Volkswagen Passat 2.0L L4
    Special Price $13.12 Regular Price $18.99
    Rein Auto Parts
  45. Rein Accessory Drive Belt Tensioner Bolt
    3 pc Rein Drive Belt Tensioner Bolts for 1999-2006 Volkswagen Golf 1.8L 1.9L 2.0L L4
    Special Price $13.12 Regular Price $18.99
    Rein Auto Parts
  46. Rein Accessory Drive Belt Tensioner Bolt
    3 pc Rein Drive Belt Tensioner Bolts for 2006-2008 Audi A3 2.0L L4
    Special Price $13.12 Regular Price $18.99
    Rein Auto Parts
  47. Rein Engine Water Pump Bolt
    3 pc Rein Engine Water Pump Bolts for 2009-2012 Audi A4 2.0L L4
    Special Price $13.24 Regular Price $18.99
    Rein Auto Parts
  48. Rein Engine Water Pump Bolt
    3 pc Rein Engine Water Pump Bolts for 2010-2012 Audi A4 Quattro 2.0L L4
    Special Price $13.24 Regular Price $18.99
    Rein Auto Parts
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OEM-Quality Automotive Cooling Components

Why pay more for the same high-quality parts? Sixity Auto understands quality isn’t about the price; it’s about performance. Our inventory contains only OEM-quality and above parts and accessories. The OEM engine cooling components we sell are from the best brands and offered at great prices. 

Rapid Fulfillment

Sixity Auto knows that timing matters. When you’re working on your car, you need parts delivered on time and ready to install. Our warehouse network ensures a fast delivery, with 99% of our orders shipping out within one business day of ordering.

Experience and Access

We have 20+ years in business under our belt. We’ve shipped over 10 million auto parts over that period, and we’ve learned a thing or two, especially regarding customer support. While we pride ourselves on our inventory and expertise, our customer support is bar none.

Frequently Asked Questions

What are the main engine cooling components?

Car cooling system parts include the radiator, water pump, thermostat, and cooling fans. These parts work in concert to prevent overheating and maintain ideal system temperatures.

Is there a problem with my car’s cooling system?

Check out the temperature gauge when your car’s running. Is it high? That’s usually the most obvious sign of a problem. Other signs could include grinding noises, coolant puddles, or steam rising from the engine bay.

Why should you buy automotive cooling components from Sixity Auto?

Sixity Auto sells OEM-quality engine cooling components at affordable prices (no dealership or store markups here). You also get the benefit of buying from a US-based company with more than two decades of experience. 

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    Rein
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  1. Accessory Drive Belt Tensioner Bolt 38items
  2. Automatic Transmission Oil Cooler Hose 115items
  3. Automatic Transmission Oil Cooler Mounting Plate 16items
  4. Automatic Transmission Oil Cooler Thermostat 15items
  5. Automatic Transmission Oil Cooler Tube 4items
  6. Belt Tensioner Damper Bolt 8items
  7. Engine Coolant Bleeder Screw 40items
  8. Engine Coolant Hose 445items
  9. Engine Coolant Hose Connector 57items
  10. Engine Coolant Hose Flange Kit 3items
  11. Engine Coolant Hose Flange Plug 11items
  12. Engine Coolant Pipe 205items
  13. Engine Coolant Pipe Bolt 4items
  14. Engine Coolant Reservoir 116items
  15. Engine Coolant Reservoir Bleeder Screw 2items
  16. Engine Coolant Reservoir Cap 600items
  17. Engine Coolant Reservoir Kit 115items
  18. Engine Coolant Reservoir Mounting Plate 25items
  19. Engine Coolant Thermostat 106items
  20. Engine Coolant Thermostat Bolt 18items
  21. Engine Coolant Thermostat Housing Assembly 100items
  22. Engine Coolant Thermostat Kit 2items
  23. Engine Water Pump 123items
  24. Engine Water Pump Bolt 21items
  25. Engine Water Pump Bolt Kit 28items
  26. Engine Water Pump Installation Kit 36items
  27. Engine Water Pump Plug 36items
  28. Engine Water Pump Pulley Kit 18items
  29. Engine Water Pump Solenoid 4items
  30. Radiator Coolant Hose 461items
  31. Radiator Coolant Hose Connector 11items
  32. Radiator Coolant Hose Kit 34items
  33. Radiator Fitting Plug 10items
  34. Radiator Mount 148items
  35. Radiator Mount Bushing 5items
Price
$
-
Pack Size
  1. 1 2737items
  2. 2 217items
  3. 3 26items
Part Placement
  1. Aux Pump To Connect 8items
  2. Aux Water Pump To Tank 32items
  3. Auxiliary 2items
  4. Cooler Inlet To Pipe 3items
  5. Cooler Outlet To Pipe 2items
  6. Cooler To Thermostat 54items
  7. Engine To Exchanger 3items
  8. Engine To Heater 18items
  9. Engine To Hose 18items
  10. Engine To Tank 7items
  11. Expansion Tank Inlet 8items
  12. Expansion Tank Outlet 2items
  13. Flange To Pump 8items
  14. Front 3items
  15. Head To Thermostat 14items
  16. Left 53items
  17. Left Lower 1item
  18. Lower 91items
  19. Lower Exchanger To Radiator 14items
  20. Lower Main Radiator 3items
  21. Lower Radiator To Exchanger 3items
  22. Lower Radiator To Housing 2items
  23. Lower Radiator To Pipe 22items
  24. Lower Radiator To Thermostat 57items
  25. Lower Tank To Aux Pump 3items
  26. Lower Tank To Connect 4items
  27. Lower Tank To Heater 3items
  28. Lower Tank To Pump 11items
  29. Pipe To Aux Pump 3items
  30. Pipe To Connector 1item
  31. Pipe To Thermostat 2items
  32. Pump To Engine 28items
  33. Pump To Pipe 39items
  34. Pump To Thermostat 3items
  35. Pump To Valley Pan 19items
  36. Radiator 107items
  37. Radiator Hose To Cooler 12items
  38. Return Pipe To Oil Cooler 2items
  39. Right 39items
  40. Right Lower 1item
  41. Tank Lower 1item
  42. Tank To Aux Pump 1item
  43. Tank To Connector 3items
  44. Tank To Radiator 7items
  45. Tank To Upper Hose 32items
  46. Tank Upper 4items
  47. Thermostat To Conn 1item
  48. Thermostat To Engine 12items
  49. Thermostat To Head 141items
  50. Thermostat To Pipe 8items
  51. Thermostat To Pump 39items
  52. Throttle Body To Cylinder 2items
  53. Upper 288items
  54. Upper Connect To Thermostat 1item
  55. Upper Main Radiator 33items
  56. Upper Radiator Hose To Flange 2items
  57. Upper Radiator To Pipe 2items
  58. Upper Radiator To Pump 11items
  59. Upper Reservoir To Radiator 9items
  60. Upper Tank To Heads 4items
  61. Upper Tank To Radiator 6items
  62. Upper Tank To Thermostat 1item
  63. Upper Thermostat To Radiator 14items
  64. Various 256items
Stock
  1. In Stock 2373items
  2. Out of Stock 607items
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100% fitment guarantee at sixityauto.com

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Your parts will fit as advertised

Shop with confidence, knowing that your purchase from Sixity Auto will fit your vehicle. If after purchase you determine that your part does not fit the vehicle we advertised, simply contact us to initiate a return. We want your parts to fit!

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Monday through Friday, 8am-8pm Eastern

We speak your language. Our staff has decades of experience selling auto parts to enthusiasts like you. Whether it's for your car, truck, or van, we have staff on hand that can answer your questions and make sure you get the part you're looking for.

For phone sales or help with product fitment questions, our U.S.-based customer service staff in California and Indiana is available weekdays, 8am-8pm ET.

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Sixity Auto works with a wide range of business customers—from repair shops and dealerships to fleet operators, government organizations, and others that purchase parts for resale or operational use.

If you are a qualified tax-exempt or resale customer, submit your documentation and we'll set you up for tax-free shopping. Check out all the details here.

military members and vets save 10% every day

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Save 10% on every purchase

Sixity Auto is proud to support our Active-Duty Service Members, Vets, and their immediate families. To show a token of our thanks, we extend a 10% discount on your entire purchase, every single day.

We use VerifyPass (formerly ID Discount) to help us manage our Military Discount program. Click here for all the details!

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© 2026 Sixity, Inc. Part of Proximity Group, an American-owned and operated online retailer. All Rights Reserved.