Skip the auto shop - Our mechanics make house calls

Q: After parts replaced, bubbles in reservoir

asked by on

The repair shop replaced the thermostat, the water pump, and also bled the system. But I see bubbles in the reservoir and also there’s no water or smoke in the tail piece. It’s not a coffee color on the dip stick. The car doesn’t shake, so that might be the radiator. What do you think is causing these problems?

A: Hello. If all of the air is out of the syst...

Hello. If all of the air is out of the system then the issue is internal. It is typically caused by a blown head gasket. This can occur when the leak is really small. When it is small enough the combustion pressure will enter the cooling system and cause this to occur without having any smoke from the exhaust. A block test can be done to identify the issue. If you want to have this test done, consider YourMechanic, as a certified mechanic can come to your home or office to inspect the issue.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car overheating.

Hi there. The check engine light on this vehicle can turn on from the engine running too cold and too hot. If the coolant level was low from the beginning then the system should have been pressure tested to identify...

Q: Starting issue, fuel smell

The fuel pressure would need to be checked to make sure the pressure regulator is not leaking fuel and that the pressure is correct. You may have a leaking injector if the pressure is okay. I recommend having a certified...

Q: Need to know how to replace oil pan gasket

With vehicles that require the engine to be raised with the oil pan replacement, it can be much more complicated than one that does not require lifting. Many times, other items have to be removed before the engine can be...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...