Q: My car's thermostat gauge is not functioning right.

asked by on

When I go to start my car the thermostat gauge don't go up like its not heating the car. When we got an oil change from jiffy lube they said we need new water pump , belt, and possibly get new thermostat also . but nothing is leaking and had the belt looked at it was fine so what could be the problem cuz sometimes we smell a burning smell and our gas seems to be going real quick. Please help me understand what's going on? Thanks

My car has 174000 miles.
My car has an automatic transmission.

The temperature gauge may not go up to operating temperature if your engine thermostat is stuck in the open position. If the thermostat is stuck open your engine may never get up to normal operating temperature and this will cause the engine computer to run the engine richer than normal causing the fuel mileage to drop.

In order to verify the thermostat is not closing you will need to start the engine when it is cold and monitor the upper radiator hose to see if it stays cool to the touch for about 2 to 3 minutes then will all of a sudden start getting hot. If the hose stays cold and gradually gets warmer as time passes up to about ten minutes if you still only still feel a warm hose then the thermostat is stuck open and needs replaced.

To avoid any unnecessary repairs, consider YourMechanic, as one of our mobile technicians can come diagnose your car and service your thermostat if proven to be faulty.

Was this answer helpful?
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. My car's thermostat gauge is not functioning right.

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: timing belt and tensioner replacement

Hello. All noises have to be diagnosed and confirmed so that you don't needlessly spend money on repairs. In your circumstance, your particular car model does require a new timing belt every 60,000 miles anyway, so if the timing belt...

Q: My car is running hot...it was smoking from under the hood, after a little bit of cooling, the smoke stopped, but it still smells

I believe you have a bad thermostat. Symptoms of a bad thermostat are coolant boiling over and very tight upper radiator hose. The smell is going to be because of the antifreeze on the engine. No worries that will go...

Q: P0421 and P0401 codes have appeared

Hello. The codes P0421 and P0401 refer to the oxygen sensor and EGR valve, respectively. It is possible that an issue with one is causing the fault to be seen by the other, as they will work loosely together. It...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...