Skip the auto shop - Our mechanics make house calls

Q: Issues with coolant pouring out of the overflow

asked by on

My car has coolant issues. It has gone about 185,000 miles. When I drive, it is usually around the city with a lot of stop and go in the traffic. One time, I turned it on and came after few minutes. I heard some noise under the hood. When I opened it, I saw coolant pouring out of the overflow. The mechanic didn't find anything wrong but replaced the thermometer. The issue persists. It happened again but coolant started disappearing. What caused this? How can I fix it? Thanks.

A: Hi there. If the engine is losing coolant, ...

Hi there. If the engine is losing coolant, then the location of the leak needs to be found first. A leak will allow the coolant to get low enough to cause it to overheat. I start by doing a pressure test on the system to locate the leak. If nothing turns up I would do a dye test. If nothing shows up on that test either, then it more than likely has a head gasket leak.

It is common for the head gaskets to leak on this engine and cause this. If there is an external leak, then that would need to be repaired. The water pump and the radiator are common external failure areas. If you need to have this looked at, consider YourMechanic, as a certified mechanic can come to your home or office to detect any coolant leaks, or any other issues, and then make the appropriate repairs.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Thermostat location.

The thermostat is located behind the outlet pipe on the front of the engine just above the water pump and pulley. The hose that hooks to the outlet pipe goes to the surge tank. Looking from the front the outlet...

Q: Front passenger wheel making noise

Hello. To properly diagnose a noise, the noise will need to be replicated in the presence of a mechanic. By your description it could be the brakes or a wheel bearing. Both which are important to the drivability of the...

Q: Battery dead after a few days

Thanks for writing in about your Mercedes Benz CLK430. This is a common problem as vehicles get older. This type of fault is called a parasitic draw and occurs when one or more component does not shut off when the...

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...
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 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.