Mercedes-Benz ML400 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 Mercedes-Benz ML400 Pressure Test Radiator Cap is $95 with $0 for parts and $95 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2015 Mercedes-Benz ML400V6-3.0L TurboService typePressure Test Radiator CapEstimate$114.99Shop/Dealer Price$132.49 - $145.62
Show example Mercedes-Benz ML400 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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5,278
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Maxwell

18 years of experience
390 reviews
Maxwell
18 years of experience
Mercedes-Benz E350 V6-3.5L - Coolant is leaking - Conroe, Texas
Maxwell was prompt. He was extremely pleasant to work with and very knowledgable about my car. He gave me a fair estimate and I have scheduled my appointment for the service. Looking forward to having my car ready for the road.

Omar

12 years of experience
287 reviews
Omar
12 years of experience
Mercedes-Benz CLA250 L4-2.0L Turbo - Brake Rotor/Disc Replacement (Front) - Hollywood, Florida
Omar was very helpful and fast.

Alexis

30 years of experience
94 reviews
Alexis
30 years of experience
Mercedes-Benz GL450 V8-4.6L - Oil Change - Miami, Florida
I am happy with the service, very fast and well explained report for future repairs.

Rodric

14 years of experience
417 reviews
Rodric
14 years of experience
Mercedes-Benz S550 V8-5.5L - Brake Pads Replacement (Front, Rear) - Atlanta, Georgia
Arrived on time. Very knowledgeable and willing to help

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Rating Summary
5,278
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5,278
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