Skip the auto shop - Our mechanics make house calls

Q: Is it my thermostat in my car that is not working?

asked by on

My car has recently went hot on me. Me and my boyfriend bought coolant and put water in the container but , it still went hot. We put on park while the car was still on and we tried to see if it was steam or smoke that needed to aired out; and we also turned on the car and turned the heat on it was something we looked up on the internet so we tried it; but it was doing the total opposite it was cold air coming from the vents when we turned on the heat then when we turned it on cold it was heat coming form there.
My car has an automatic transmission.

You are correct, you probably do have an issue with the thermostat. When your thermostat is stuck in the closed position it doesn’t allow coolant to run through the engine which is why you have the cooling effect. It will also overheat because it isn’t allowing the coolant coming from the radiator to go through the engine. If you replace your thermostat your issue will be fixed. If you would like one of our professional technicians to repair your thermostat you can book one in your area.

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!
  1. Home
  2. Questions
  3. Is it my thermostat in my car that is not working?

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: Smart Entrance Control Module needs replacing

The SECM may be ok. It may have a power issue due to a blown fuse or relay. The SECM is an expensive part and may require factory level programming. I suggest having a qualified technician fully inspect your vehicle's...

Q: Engine loses power when i put radiator cap on

When you overheated the engine before when the radiator broke, you must have blown the head gasket. Have the radiator pressure tested to see if the engine cylinder gets coolant in to the cylinders. This will indicate a blown head...

Q: Thermostat and odometer

You have two separate issues going on here. The odometer readout not showing the mileage is likely a faulty instrument panel or the wiring related to this. The thermostat functionality is separate from that of the odometer. As you may...

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...
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...
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...