Skip the auto shop - Our mechanics make house calls

Q: Coolant temperatures seem too high but my coolant levels are fine

asked by on

I just replaced my radiator. Hit a bucket and cracked a small hole in it. The new one is in and I've been watching my coolant temp like a hawk. After 15 minutes of driving my temperature will spike to 212. Doesn't seem normal for it to get that hot but I never paid attention to the gauge before the accident so I dont know what's normal for my car. Nothing else was damaged apart from the radiator and the fan works fine. I did have to recharge my a/c, but it lost its charge after a few days. Checked all attachments, nothing is loose. On a hot hot day last week it hit 227 waiting at a red light. I haven't driven longer than 30 minutes since putting in the new radiator and have a two hour drive coming up this weekend. And I check my coolant level every morning. Haven't had to fill it at all. What's making it run so hot?

My car has 110000 miles.
My car has an automatic transmission.

Hey there. There are many newer cars that require you to prime the radiator system anytime you add coolant and especially when you install a new one.

The reason for this is that air gets trapped in the coolant lines and will cause an overheating situation. However, a broken water pump might also be causing this problem.

Anytime you have an accident that damages the cooling system, it’s recommended to start from scratch. Replace the radiator, inspect the pump, replace the belts, and prime the coolant system to ensure no air is trapped in the system. A worse case scenario is that you have a blown head gasket that is causing the overheating issue. If you can, start from scratch or contact a local ASE certified mechanic to help you diagnose the overheating problem.

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: Brakes squeaking

Look through your vehicles wheel at your brake caliper, this is the part that holds the brake pads. The pad thickness should be greater than 2mm, if not the brake pads will often squeak. This is because most pads have...

Q: Gear shifter stuck

Most of the time, when a gear shifter gets stuck in position, it is the fault of the shift lock actuator. This actuator allows movement of the shifter only when the brake pedal has been depressed. If this actuator has...

Q: dash and console lights out - 2005 Chevy Cobalt

Try to adjust the dashboard light's rheostat to see if it is turned all the way dim in such a way that you cannot see the lights. If the rheostat is turned up and it the lights are still not...

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...
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.