Skip the auto shop - Our mechanics make house calls

Q: 99 mercury cougar with a 4 cylinder leaking antifreeze from the overflow hose but car is not over heating could it possibly be the

asked by on

Antifreeze leaking from overflow hose car is not overheating it will start leaking then stops and then starts again

My car has 192000 miles.
My car has a manual transmission.

A: Good question. In my experience, I believe ...

Good question. In my experience, I believe you have a water pump issue. Another issue could be the thermostat but generally speaking the thermostat will cause the engine to over heat. The water pump could be going bad though which is causing it to boil over sometimes.

Listen for noises under your hood, usually when a water pump is going bad it will squeak a bit. If you aren’t quite sure, have the coolant system flushed to ensure there is no rust or debris clogging your system.

  • Note: Mixing colors of antifreeze can cause serious problems with your cooling system. Make sure you NEVER mix colors. It causes corrosion and crystallization which could be detrimental to the life of your engine.

If you need assistance with this repair, consider YourMechanic, one of our mobile technicians will be able to go to your home to diagnose this issue and service your water pump and flush your cooling system as necessary.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: My car overheated twice

Hi there. Overheating problems can be caused by multiple issues, ranging from an air bubble trapped in the coolant lines, to a faulty or damaged water pump. One items that is concerning for your 2006 Nissan Altima, however, is that...

Q: My car trys to run hot and it leaks anitfrez and my heat don't blow out hot

You will need to identify where the coolant leak is. The water pump or heater core may be leaking causing the cooling system to get low on coolant causing the heater to stop working since no coolant is in heater...

Q: My car idles rough when at a stop and almost stalls why might this be?

Hello. Typically, if this vehicle runs fine at all other times and will have trouble idling when coming to a stop, it is almost always caused by a bad idle control valve. Most of the time the valve fails making...

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 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...