Skip the auto shop - Our mechanics make house calls

Q: Water coming out of overflow tank

asked by on

My car started over heating bad so I changed the radiator and cap, water pump, thermostat and lower radiator hose. It was still overheating so I did a head gasket job on both heads. I got the full gasket kit and replaced all the gaskets. I wired my fans so they are always running when the key is turned on. But now when I drive and put the car in park and turn it off water starts flowing out of the overflow reservoir. What could be the problem?

My car has 18000 miles.
My car has an automatic transmission.

A: The coolant in the engine has the job of re...

The coolant in the engine has the job of removing heat from the engine and releasing the heat by way of the radiator. The coolant is circulated by the coolant pump. If there is a pressure created internally other than the coolant system creates, it can prevent this flow. If coolant is coming out of the overflow it is overheating. Coolant system failure can be a slow process until the signs are hard to ignore. Running the coolant fans are just masking the problem.

Antifreeze has a time limit before it needs replacing, five years is the maximum time allow. If the vehicle has been overheated to a damaging point it can crack the engine's cylinder heads causing a pressure to enter the coolant system. This will stop or slow the flow rate of the coolant pump which will cause a overheating condition. There are tests that can be preformed to confirm this. I'd suggest getting some assistance from a certified technician, such as one from YourMechanic, to diagnose your overheating issue and make the necessary 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・Save up to 30%

Get a quote

What others are asking

Q: Coolant leak in a 2004 Volkswagen Passat

Can you see where the coolant is leaking? How often are you having to add antifreeze, always remember when you're having to add coolant to a system, if you don't add at least a mixture of coolant you will dilute...

Q: Engine Oil

It is a bit unclear what the question is but assuming you are looking for an oil recommendation, it would depend on the driving habits and conditions the truck is subjected to. Since it has been 28k miles since the...

Q: will not keep a charge

The battery and charging system will need to be tested to see if the battery can be charged and handles a load test. If battery fails test then it should be replaced first. After the battery is tested and replaced,...

Related articles

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.