Skip the auto shop - Our mechanics make house calls

Q: Car temperature gauge is halfway. I just changed the thermostat. Why isn't it going down?

asked by on

The only way the gauge will go down is if I have the heat on blast on the floor board

My car has 151282 miles.
My car has an automatic transmission.

Hey there. There are a few other reasons aside from the thermostat that may cause the car to overheat such as a clogged radiator or potentially a faulty coolant fan switch. A clogged radiator may prevent the coolant from flowing in and out of the motor if the passages are blocked. A coolant fan switch monitors the temperature of the coolant and engages the cooling fans to turn on and off depending on the temperature of the coolant. When this is not working properly, the fans may come on all the time, intermittently. or sometimes not at all. If you would like to have this scoped out before making a repair, a certified technician from YourMechanic can come to your car’s location to diagnose the car and advise you on any needed 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

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
  • Car temperature gauge is halfway. I just changed the thermostat. Why isn't it going 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: Weird noise

The gurgling sound you hear is likely coolant at work inside your radiator and heater core. The gurgling sound can be produced a few different ways. If the cooling system was not properly flushed the last time the coolant was...

Q: Engine seized in 2005 Acura TL

Hi. An engine replacement in your vehicle will cost between $2,000 and $4,000. This Depends on where the engine is installed and where the replacement engine is ordered from. The engine itself can range from $500 to $2,000. The labor...

Q: 1998 GMC keeps overheating on the temperature gauge. It's full of water and has a new thermostat.

Hi and thanks for writing to YourMechanic. There are several things to look at. First off, have the coolant tested and make sure it is within spec. If coolant is not mixed at the correct ratio, it can cause the...

Related articles

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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...