Skip the auto shop - Our mechanics make house calls

Q: Reservoir coolant boiling.

asked by on

Sometimes the coolant in the reservoir starts to boil.I check the hoses and they aren't hot or stiff from too much pressure. Also, the temperature falls within good operating temperatures.

Hello! The cooling system removes a lot of heat from the engine and this process can create a lot of pressure. Expansion tanks or coolant reservoirs are designed into many of these systems. These tanks are used to bleed off extra pressure beyond the systems maximum safe limits and the fluid is able to escape into these tanks. Have a mechanic, like the ones at YourMechanic, inspect the cooling system to ensure proper cooling system fluid level and operation.

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

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: Can you do a front end alignment? 2005 Chrysler Sebring

Hi there - it sounds like you have damaged a tire or the wheel itself, and perhaps bent one of the suspension links with this impact. I would recommend a suspension inspection by a mobile, professional mechanic, such as one...

Q: Put new battery in the car and it trys to start but wont

This may be related to many different possibilities, some of which may be related to a lack of spark and some of which may be related to a fuel delivery problem or a combination of both. For example, if the...

Q: Location of crankshaft position sensor with pictures

Hi there. The crankshaft position sensor is located at the rear of the engine block near the transmission. Unfortunately I cannot send over any pictures. If you need to have your crank sensor replaced, consider YourMechanic, as a certified mechanic...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.