Skip the auto shop - Our mechanics make house calls

Q: Overheating coolant reservoir has a pinhole in it. Is this the cause of overheating?

asked by on

Pinhole in coolant reservoir will this cause overheating

My car has 224000 miles.
My car has an automatic transmission.

A: Hey there. If the coolant reservoir is leak...

Hey there. If the coolant reservoir is leaking, then it could leak out enough coolant to cause the engine to overheat. The reservoir is known to get stress heat cracks and leak coolant. You might see a small pinpoint leak, but as the engine runs hotter it will push out more and more coolant.

I would suggest having the cooling system checked for overheating then pressure tested for the leaks. If the coolant reservoir is leaking, then have it replaced. Run the engine to verify the cooling system fans come on and the system does not overheat. A certified professional from YourMechanic can come to your car's location to diagnose the leaking coolant if you need this taken care of.

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・Save up to 30%

Get a quote

What others are asking

Q: Code p0128

Your vehicle does not have a coolant sensor and uses the cylinder head temperature sensor to do both jobs. The system uses this sensor to sense both the coolant and head temperature. If your vehicle fan is running all the...

Q: Gas line leaking

Fuel lines by the engine on GM cars are usually plastic and use quick connects. The fuel rail that houses the injectors is steel. The leak could be a failed O-ring or a cracked line. Do not delay this repair...

Q: Front differential

The front differential has a purpose to propel the front wheels, in turn giving your Mercury its 4 wheel drive capability. If you are experiencing abnormal rotational sounds or a clunking or banging during acceleration or deceleration while the 4...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...