Mercedes-Benz SL450 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 SL450 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 Mercedes-Benz SL450V6-3.0L TurboService typePressure Test Radiator CapEstimate$114.99Shop/Dealer Price$124.99 - $132.49
2017 Mercedes-Benz SL450V6-3.0L TurboService typePressure Test Radiator CapEstimate$94.99Shop/Dealer Price$105.01 - $112.52
2019 Mercedes-Benz SL450V6-3.0L TurboService typePressure Test Radiator CapEstimate$94.99Shop/Dealer Price$105.01 - $112.52
2018 Mercedes-Benz SL450V6-3.0L TurboService typePressure Test Radiator CapEstimate$94.99Shop/Dealer Price$104.99 - $112.48
Show example Mercedes-Benz SL450 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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Mario

4 years of experience
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Mario
4 years of experience
Mercedes-Benz SL450 V6-3.0L Turbo - Battery - North Palm Beach, Florida
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19 years of experience
552 reviews
Eduardo
19 years of experience
Mercedes-Benz GL450 V8-4.6L - Serpentine/Drive Belt - Katy, Texas
Outstanding in all respects.

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9 years of experience
56 reviews
Donald
9 years of experience
Mercedes-Benz E350 V6-3.5L - Battery - Houston, Texas
Donald is extremely knowledgeable when it comes to Mercedes E350. He takes his time to explain what he is doing and the functions of each part he is replacing. I give him 5 stars because he shows up on time and he definitely cleans up after he is done.

Chris

15 years of experience
112 reviews
Chris
15 years of experience
Mercedes-Benz ML500 V8-5.0L - Car shuts off when stepping on gas pedal - Zephyrhills, Florida
Chris is great! He knows what he’s doing.

Excellent Rating

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Rating Summary
5,188
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117
5,188
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