Q: Can a bad water pump cause water in the oil

asked by on

Can a bad water pump cause water in the oil

My car has 91000 miles.
My car has an automatic transmission.

Hi and thank you for your question. Water pumps are designed to pump water through the engine, radiator, and heating system. Water pumps will not cause oil to enter the cooling system. The oil coming into the water can be caused by three different things.

First, since you have an automatic transmission, the transmission fluid is cooled by the radiator. The radiator could have broke inside causing the oil to mix in the cooling system. To see if the radiator is the problem, pull the dipstick to the transmission and check the oil. If the oil is milky, then the radiator is your problem.

The second way oil can mix with coolant is though the timing cover. The cover could have caused corrosion and ate though to the water pump’s gallery. This will make the coolant mix with the oil.

The third way that oil can mix with the coolant is when the engine has blown a head gasket. However, if the head gasket is blown, the engine may overheat and have loss of power. I would check the water in the radiator, oil in the engine, and the oil in the transmission.

If you are still having trouble, I would recommend having a local expert inspect the fouled oil and proceed with any repairs that are needed.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Can a bad water pump cause water in the oil

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: Car runs hot when air conditioning on

If your car is running hot when your air conditioning system is turned on then there may be a problem with the vehicle's cooling system. When the air conditioning is turned on, it puts an additional load on the engine,...

Q: i smell coolant and found some on top of motor

Hi Marcel. Thanks for submitting your question today. If you found coolant on top of the motor, then it is more than likely that the coolant inlet hose attached to the top & side of the motor either has a...

Q: Prius 2011 hybrid system check message .orange triangle with exclamation mark icon

Hello there. Many different items can cause the hybrid check light to come on. The most likely are a failed 12 volt battery, software issue, hybrid battery issue, wiring issue, or auxiliary hybrid cooler. If you would like to have...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.