Skip the auto shop - Our mechanics make house calls

Q: Coolant leaking from top of coolant tank

asked by on

I was driving one day and when I came home and parked my car a few hours later noticed a very small puddle of coolant on the ground. Popped the hood and saw that the coolant was low. Top it with with some water and left it. A week later I was driving and noticed the temp gauge was fluctuating above 50%. I went to gas statioN to get gas and all my coolant started leaking out of nowhere. Popped open the hood and the cap was loose but still on and all the coolant had overflown out of the tank and down the sides.

My car has 70000 miles.
My car has an automatic transmission.

A: You either did not get the coolant cap tigh...

You either did not get the coolant cap tightened completely when you topped it off before or you have a defective cap. Replace the cap and refill the system while making sure the cap is on all the way. If the problem persists and you suspect something is wrong, then have a certified mechanic, like one from YourMechanic, diagnose the coolant leak firsthand for you. Good luck.

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: Rear window leak

More than likely the rear window trim is allowing water to enter. The trim and/or windshield may need to be replaced. I suggest having a professional, such as one from YourMechanic, inspect your windows firsthand for a definitive answer of...

Q: Compressor failed on 2010 Equinox. Need to replace compressor, what other parts need to be changed at same time?

Depending on how the compressor failed, it would be wise to replace the condenser as well. This cools the refrigerant as it leaves the compressor. You may want to also replace the expansion valve which is what is responsible for...

Q: Car overheating. Heating blowing cold air.

Hello, thanks for writing in about your 2003 Dodge. This is a good question. From what you've described, your car either has a clogged heater core or is low on coolant. I have had this issue before and once I...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...