Q: Car runs hotter than normal on express way

asked by on

Car runs hotter during higher speeds then cools back down during lower speeds

My car has 1145000 miles.
My car has an automatic transmission.

Hello. If the car is running hot at higher speeds, then that typically means it has a clogged radiator or a thermostat that is not fully opening. It can also be caused by a slightly leaking head gasket. I usually start by doing a block test just to eliminate the head gasket as a possibility. If it is fine, then I use a temperature gun to diagnose the other components in the cooling system. If you need to have this done, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the overheating problem and proceed with appropriate repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. Car runs hotter than normal on express way

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: What does it mean when your charging system failure light comes on out of no where while driving?

Hello, thank you for writing in. The vehicle is detecting an issue with the alternator or the battery. When supplied power from the system is too low or too high, the monitoring system will alarm you. You should have the...

Q: Car smoking and misfiring

The misfire alone is not enough to deem a blown head gasket. The fact that you have the white smoke present along with the misfire is sound evidence that this is the case. The white smoke means you are burning...

Q: High idle, loss of power, overheating

Hello. Thanks for writing in about your 1994 GMC K1500 Suburban. A dirty throttle body will cause the power loss and RPM fluctuations. Also, a thermostat opening slow could be the cause of your overheating concern. This should be checked...

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...
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...