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.

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!
  1. Home
  2. Questions
  3. Overheating coolant reservoir has a pinhole in it. Is this the cause of overheating?

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: Why does my Engine sounds like a tractor.

Hey there. Your symptoms sound like many of your problems may be coming from a failed engine mount. The engine mount can fail and allow some extra movement of the engine and transmission assembly. To have this verified, a certified...

Q: Burning smell when constantly doing maneuvers - 2003 Vauxhall Corsa

Hello there. Unfortunately, we don't typically work on Vauxhall Corsas here in the U.S., but there are a few items that could cause a burning smell including a leaking engine or transmission oil, a "petrol" leak under the hood (as...

Q: Part fell in engine are

Typically, a magnet is used for retrieval. There are commercial retrieval tools, for example sold at Sears or Autozone. However, if you have a compact, powerful magnet at home, you can take a piece of long wire (12 or 14...

Related articles

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.