Skip the auto shop - Our mechanics make house calls

Q: Temperature gauge is fluctuating, sometimes showing overheating.

asked by on

Ok so my temp gauge is fluctuating sometimes alot more then some it goes all the way up to overheat then goes back down to normal i just replaced thermo stat burped the radiator then a little bit ago it started fluctuating alot more and now when i get done driving it theres alot of antifreeze in the overflow tank and i can see that it comes out of the top of it to. Im dreading it might be a blown head gasket since ya know 2.5s go hand and hand with them im just looking for a second opinion.
My car has an automatic transmission.

A: Hey there. There are combustion gas analyze...

Hey there. There are combustion gas analyzers that you can buy and use on a DIY basis for this, but I would have a professional perform the diagnostic, and hopefully find the fault elsewhere (other than head gasket leak). You’ll have to check out the entire cooling system before you get to the head gasket. The radiator could be plugged, could have plugged cooling passageways, could have a defective water pump, loose belt issue, collapsed hose, excessive load on the engine due to dragging brakes, underinflated tires, and so forth. Also, if the engine timing is off, the engine running too lean, or the exhaust is plugged (catalytic converter) those conditions can cause the engine to overheat. Quite a number of possibilities have to be looked at. If you want to rule out the worst, certainly you could check for exhaust in the coolant on a DIY basis. For help getting this checked by a professional, I recommend having a certified technician from YourMechanic inspect the overheating concern so that this can be corrected.

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: Can a bad thermostat cause me to have to keep putting coolant in my car?

Hi, thanks for writing in. The thermostat in the engine cooling system is a valve that opens and closes as engine temperature fluctuates. The purpose of the valve is to keep the engine operating temperature at a relatively constant, optimal...

Q: overheating

You most likely have a coolant leak in the radiator. Running your Accord low on coolant will damage the engine and blow the head gasket. Have the cooling system pressure tested to see what is leaking.

Q: Car lacks power

First check your EGR system for leaks. If EGR is on or stuck, at idle, that can cause rough operation. To further diagnose your issue, obtain compression test results (in case the issue is due, even in part, to burned...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...