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

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: Car has trouble shifting.sometimes the "D" in the dashboad display will dissappear and the car will then rev to 3000 to 4500 rpm.

What you are describing may be a result of a faulty speed sensor, potentially low transmission fluid or a even a faulty transmission control solenoid. As your vehicle travels down the road, the computer analyzes data being sent by vehicle...

Q: My Car Wont Start After Being In An Accident

Anytime a car is in an accident you may have damages to the engine harness, fuel pump or even components that can be damaged when the accident happened. I would recommend having the computer scanned and systems checked by a...

Q: Car problems

It will depend on why you had the engine rebuilt? If you had the engine rebuilt due to overheating and coolant came out of your exhaust then you may have damaged the catalyst during this period by sending hot coolant...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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...