Skip the auto shop - Our mechanics make house calls

Q: Temp gauge

asked by on

After little driving my temp gauge will fluctuate from low to high to back to low then slowly creep half way up

My car has 214368 miles.
My car has an automatic transmission.

A: This is either caused by a defective temper...

This is either caused by a defective temperature sending unit or your thermostat sticking and getting ready to go bad. Have the vehicle temperature monitored using a laser temperature tester and a scanner hooked up to monitor the temperature sender to the computer.

If the temperature rises to about 190 degrees and then goes down to about 180 and then levels off around the 190 range, then the thermostat is okay and the temperature sender reading should be monitored to see if it matches. If the thermostat goes up above about 200 or more before it opens, then it is sticking badly. Replace the thermostat if that is the case.

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: How do I use the trip timer?

The trip timer allows you to keep track of how long you have been driving for. When reset, the trip timer will run anytime the car is running, and pause whenever the car is stopped. That way, you can measure...

Q: AIR ESCAPING UNDER DASH

You may have a disconnected duct work for the air vents behind the dash. The connections are with foam tape or insulation and the insulation falls off or apart over time and do not deal any more. Have a mechanic...

Q: When should the airbag system be serviced?

The airbag system in your vehicle does not need routine maintenance. The system was designed to always be operational. To determine when the airbag system in your vehicle needs to be serviced. Looks for indications on the dashboard that...

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...
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...
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.