BMW 840i Gran Coupe Pressure Test Radiator Cap at your home or office.

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Pressure Test Radiator Cap Service

How much does a Pressure Test Radiator Cap cost?

On average, the cost for a BMW 840i Gran Coupe Pressure Test Radiator Cap is $95 with $0 for parts and $95 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2020 BMW 840i Gran CoupeL6-3.0L TurboService typePressure Test Radiator CapEstimate$114.99Shop/Dealer Price$124.99 - $132.49
2021 BMW 840i Gran CoupeL6-3.0L TurboService typePressure Test Radiator CapEstimate$94.99Shop/Dealer Price$105.01 - $112.52
2022 BMW 840i Gran CoupeL6-3.0L TurboService typePressure Test Radiator CapEstimate$94.99Shop/Dealer Price$105.01 - $112.52
Show example BMW 840i Gran Coupe Pressure Test Radiator Cap prices

What is the radiator cap pressure test all about?

In a pressurized cooling system like those found on all cars, your car’s radiator cap is calibrated to seal in coolant to a particular pressure point, then allow some vapor to escape once that threshold has been reached. The ejected fluid is piped into the overflow bottle you might have seen in the engine bay. Then, as the engine cools, the coolant level may drop inside radiator. When that happens, a reverse-flow valve in the radiator cap opens to allow fluid from the bottle to return to the radiator. A radiator cap that isn’t working properly may cause too much fluid to escape the system.

Keep in mind:

  • A radiator cap pressure test is quick and simple, and replacement radiator caps are inexpensive.
  • Leaving a defective radiator cap in place can cause damage to the engine.

How it's done:

  • The vehicle engine is cooled before the radiator cap can be removed
  • The radiator pressure is relieved and the cap is removed
  • The radiator cap is pressure tested to specifications
  • The radiator cap is replaced and/or reinstalled to the radiator
  • The vehicle is verified to confirm problem is fixed

Our recommendation:

If your car’s engine overheats, or the overflow bottle seems overly full, have the radiator (and radiator cap) pressure tested.

What are the common symptoms indicating you need to pressure test the radiator cap?

  • Car overheats
  • Car’s overflow bottle fills up

How important is this service?

Not having this safety valve on the car’s cooling system operate properly can over- or under-pressurize the system, leading to damage to hoses, the radiator, and even the car’s cylinder head.

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Jonathan

13 years of experience
171 reviews
Jonathan
13 years of experience
BMW 335xi L6-3.0L Turbo - Spark Plugs - East Greenwich, Rhode Island
Highly recommended. He was to explain the problems, show the damage, and make sure the work was done well. The convenience of home repairs is out of sight! no more waiting at garages or using a loaner. Analytical skills are above 95% of other mechanics I've dealt with in the past.

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33 years of experience
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Paul
33 years of experience
BMW X3 L6-3.0L - Window Regulator Replacement (Driver Side Front) - Raleigh, North Carolina
Paul was awesome! He was punctual, fast and friendly! I'm so happy to have my car fixed, hassle free, at my own home!

Rigoberto

11 years of experience
739 reviews
Rigoberto
11 years of experience
BMW 325i L6-2.5L - 120,000 Miles Maintenance Service - Chicago, Illinois
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Robert

31 years of experience
641 reviews
Robert
31 years of experience
BMW 325i L6-2.5L - Fuel leak under the body, towards back on driver side. - San Jose, California

Excellent Rating

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6,327
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147
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