Skip the auto shop - Our mechanics make house calls

Q: My car is overheating and I would like to pinpoint the cause.

asked by on

I purchased this g35 recently so I don't now much about the prior history but what I do know is that it's now starting to overheat. First indication that something may be wrong with my cooling system was one night when trying to warm myself up inside my car I noticed that there was no heat. This was the first time I needed heat so I don't know if this was a new problem or old. I opened up the radiator made sure there was fluid present and tried burping it with the relief valve, no change. Next day while driving to work I noticed the temperature kept rising. Pulled over, waited for it to cool down, put water that I had near me in there. Temperature seemed fine. Couple days later same problem except this time it was not sovled. Thought it may be my thermostat. Changed it still no change. Now I am thinking it may be my water pump but I haven't noticed any leaks and the oil doesn't seem to be mixed with any coolant (as far as I can tell) and my radiator seem to be working just fine. Thanks

My car has 105000 miles.
My car has an automatic transmission.

Great description of the problem - your observations helped eliminate the issues it could possibly have. From what you’ve described, you may have a clogged heater core. Fix and flush your system. While flushing the system, make sure you look at the color of the antifreeze and see if you notice different colors. If so, then there is your problem.

You made a suggestion about the water pump. This could also be the cause, but I would try more simple solutions first and see if you can get it back to proper running temperature.

Note: A cracked head gasket doesn’t always give you signs like milky oil or oil in your antifreeze.

If you would like a more precise diagnosis of the issue, a certified professional from YourMechanic can come to your location to inspect the overheating problem and follow through with repairs.

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: overheating no cooling fans

The relays are turned on by the Powertrain Control Module (PCM) by grounding the control wire of the relays. The PCM needs input from the engine coolant sensor above the water pump to sense whether the engine is overheating before...

Q: Heater doesn't work correctly

The most likely cause of an inoperative heater (aside from low coolant) is a faulty thermostat. Hot engine coolant flows through the heater core. The blower motor blows air over the heater core and into the passenger compartment to warm...

Q: Overheating

The excessive pressure causing the hoses to blow off suggests that your cooling system is not flowing properly and that there is a back up of some kind somewhere in the system. This is generally caused by a faulty thermostat...

Related articles

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.