Skip the auto shop - Our mechanics make house calls

Q: Engine Overheating

asked by on

At lower speeds, my car runs really hot. However, at high speeds, it gets back into a normal range. I just had the coolant flushed about 5k miles ago, but had to add coolant recently. Not sure if it water pump is going out or if there is a leak in my coolant.

My car has 151000 miles.
My car has an automatic transmission.

The engine will run cooler at high speeds because it benefits from the ram air passing through the radiator. At low speeds, there is not as much air flow. That’s why your vehicle is equipped with an electric cooling fan. Anything that affects cooling system performance will be more noticeable at low speeds. Since you said the vehicle is also loosing coolant, I would first look for external leaks by pressure testing the cooling system. If none are found, you’ll want to check for internal leaks such as a blown head gasket or cracked head. I recommend having a professional, such as one from YourMechanic, diagnose and repair this issue for you (https://www.yourmechanic.com/services/car-is-overheating-inspection).

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: Broke down on the highway and had towed to a Buick dealer. They diagnosed and replaced the catalytic converter.

It is possible that the new catalytic converter is bad. Sometimes, when the converter comes apart inside, it can get into the muffler and cause it to be clogged.

Q: My 2007 Toyota Yaris jerks a bit when I press the accelerator- usually when it is cold.

Hello. Most of the time a jerking is caused by an engine misfire. If the engine has not been tuned up in some time it may be as simple as that. It can also be caused by a sensor that...

Q: Computer showing codes for things not broken

When a car's Check Engine Light comes on it is telling us there is a fault in a system and a code is displayed. When this code is displayed, it tells us where to start looking for a fault, but...

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...
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...
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...