Skip the auto shop - Our mechanics make house calls

Q: Coolant overflowing from reservoir cap

asked by on

The coolant in my car is overflowing from the reservoir cap.

A: Coolant overflowing from a reservoir can be...

Coolant overflowing from a reservoir can be caused by many things, ranging from a problem a small problem such as replacing the cap, to a potential mechanical work, so I would recommend having the vehicle looked at by a knowledgable technician. I would first check to make sure that the sealing surface on the cap and reservoir are both in good sealing condition. If either one is damaged I would recommend a replacement to your coolant reservoir. If both seem to be okay, then that may be indicative of another problem, which can vary from engine mechanical on the vehicle's cooling system, to electrical problems with the fan. Have a certified mechanic thoroughly inspect your cooling system so that a proper diagnosis can be made.

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・Save up to 30%

Get a quote

What others are asking

Q: Noise when turning to the left

It's difficult to say without inspecting the vehicle firsthand just what the noise is. A worn or damaged wheel bearing will make a rotational growling noise that often gets worse when turning. To check for a bad wheel bearing, lift...

Q: Radiator is leaking

Hello! The origin of leaks can sometimes be difficult to see when they run. A qualified technician will perform a cooling system pressure test, which will show exactly where the leak is coming from. Hoses, thermostat and the radiator, are...

Q: Boot white smoke exhaust pipe

This is most likely caused by a blown head gasket that's leaking coolant into the engine cylinders. Have the cooling system pressure tested to see why oil and coolant is mixing. The cylinders heads are either leaking or cracked. Have...

Related articles

How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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...