BMW 645Ci 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 645Ci Pressure Test Radiator Cap is $95 with $0 for parts and $95 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2004 BMW 645CiV8-4.4LService typePressure Test Radiator CapEstimate$114.99Shop/Dealer Price$132.49 - $145.62
2005 BMW 645CiV8-4.4LService typePressure Test Radiator CapEstimate$94.99Shop/Dealer Price$112.52 - $125.67
Show example BMW 645Ci 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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Meet some of our expert BMW mechanics

Real customer reviews from BMW owners like you.

Excellent Rating

(24)

Rating Summary
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Tien

23 years of experience
903 reviews
Tien
23 years of experience
BMW 645Ci V8-4.4L - Alternator - Oakland, California
As always, Tien is an excellent technician regarding the work he performed on my car. He was through, fair, honest, and an excellent professional. I strongly recommend him to others and will continue to use his skills as necessary regarding my cars.

Grzegorz

41 years of experience
473 reviews
Grzegorz
41 years of experience
BMW 645Ci V8-4.4L - Battery - San Francisco, California

John

27 years of experience
1019 reviews
John
27 years of experience
BMW 645Ci V8-4.4L - Engine is misfiring - Hitchcock, Texas
Wanna feel good about a service call, call this guy. Great knowledge of my vehicle and explained the issue in a way I could understand it.

Patrick

32 years of experience
369 reviews
Patrick
32 years of experience
BMW 645Ci V8-4.4L - Oil Change - Las Vegas, Nevada
He seems professional. I paid for the lights to be addressed and they are all still on including a low engine oil light. He said he would return to check it out further after his next appointment but I did not hear back from him. I was told by BMW that the power steering fluid needs to be drained, flushed and refilled. He sucked it out with a hose twice and this will not ensure that the oil that was accidentally placed in there would be completely removed. I am no mechanic but I am going off of what BMW told me. I wanted to get a lot more work done. I want all the lights to be addressed and fixed so I started with the check engine lights to be looked at and not just reset. I want everything to be fixed. Thank you

Excellent Rating

(24)

Rating Summary
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Number of BMW 645Ci services completed
264+
services done by our mechanics
TOTAL NUMBER OF EXPERT BMW MECHANICS
1100+
experts on our platform

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