Skip the auto shop - Our mechanics make house calls

Q: Temperature gauge goes up and down

asked by on

The temperature gauge is going up and down.

Hello. If the coolant temperature gauge is constantly fluctuating then the most common cause of this is a bad thermostat. If the thermostat is sticking or not opening and closing right then this will occur. It can also be a clog in the radiator or a water pump problem. If the engine has never gotten too hot then the thermostat should be replaced first. If the problem persists then the engine should have a block test and then the coolant needs to be checked to make sure it is flowing. If it is not then the water pump may be bad.

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
  1. Home
  2. Questions
  3. Temperature gauge goes up and down

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: New tension belt was put on and the car will not start. The car computer is saying the timing belt is off.

Hi there. The serpentine or drive belts have nothing to do with the timing belt on the car. It depends on the tensioner that was installed, either the drive belt tensioner or the timing belt tensioner. I recommend seeking out...

Q: timing belt and driving belt replacement interval

The timing belt should be checked every 24 months or 30K miles and replaced every 48 months or 60k miles. You are not due until 173k for a timing belt replacement, but should get inspected at 143k. The accessory belts...

Q: How do you reset the mileage gauge on the dashboard

You should have a "select/reset" knob up in the right hand corner of your dash that will allow you to click and scroll through the various displays such as instant fuel economy, odometer, trip meter, outside temperature. Be sure the...

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...
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...