Skip the auto shop - Our mechanics make house calls

Q: Temp gauge fluating between halfway and hot but runs at halfway mark on freeway but rises to hot at lights

asked by on

My temp gauge started going from halfway to hot on g35 coupe yesterday slowly rising then back down again but my engine doesn't feel hot

My car has 21000 miles.
My car has an automatic transmission.

Hi there. The temperature gauge fluctuating between halfway and hot, at stops, is most likely the radiator cooling fan(s) is inoperative. This could be caused by a blown fan fuse, a faulty cooling fan relay, a faulty cooling fan switch, and/or possibly a faulty cooling fan(s) motor. The cooling fan(s) are designed to come on with a/c engagement and turning on the a/c system, you should hear and see the radiator fan(s) turn on. Proper diagnoses should be performed to avoid unnecessary repairs. I recommend having your vehicle’s temperature gauge fluctuates be diagnosed and repaired by a certified technician, such as one from YourMechanic.

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!
  • Home
  • Questions
  • Temp gauge fluating between halfway and hot but runs at halfway mark on freeway but rises to hot at lights

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: Engine shakes intermittently after warmed up with car in "drive" at a stop. Single shakes at a time.

Hi there. There could be an issue with the fuel system or with the ignition system on your vehicle. It seems that the engine is having a minor misfire. Check the spark plug wires and see if any of them...

Q: Thermostat

Hi There, It sounds like you may have a faulty thermostat that may be sticking closed not allowing the coolant to circulate properly when the vehicle is at a stop. Since the AC puts an additional load on the motor...

Q: Camry not starting

Hi there. No start conditions can be caused by a whole host of possible causes. Fuel pressure needs to be checked to ensure there is fuel available for startup and verify fuel pump operations. Power to the fuel injectors comes...

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...
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...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...