Q: car going hot then cold back to hot then cold again

asked by on

the car is going set temp to hot then cold then hot again and then cold and stay there and then move up to hot when the car is not moving

My car has 234344 miles.
My car has an automatic transmission.

The information given is not enough to definitively say what the issue is. Consider the following questions. Is it the dashboard temperature gauge that is reading like this, or have you checked the actual engine temp with an infrared thermometer, and know for a fact the engine is jumping temperatures? The dashboard’s gauge may be giving you false information. If not, and the engine is truly jumping up an down, you need to have your vehicle inspected by a technician right away. The gauge however, can be getting false information from the computer, or may just be broken itself. Instrument clusters can vary in price and complexity depending on your make and model. You may want to have your vehicle assessed with a scan tool, to get a better idea if any sensors have failed or are reading strangely.

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. car going hot then cold back to hot then cold again

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: I checked the Check Engine Light and the code P1700 came on which relates to the throttle position sensor. How do I fix it?

Hi and thanks for contacting YourMechanic. The code P1700 is stored from a faulty vacuum box on the transmission kickdown cable or a vacuum leak. Check under the hood for any vacuum hoses that are broken especially the ones to...

Q: My 1990 Subaru Legacy wagon is overheating, coolant is full though. Some slight smoke coming out of the end of the radiator hose.

Hello, thank you for writing in. If the coolant is full this time, and no loss of coolant has taken place, then you are likely experiencing a lack of coolant flow. When the coolant is not circulated through the system,...

Q: Wobbly Power steering pully part 2

The only suggestion on the pulley is to go to the dealer and see if it was ever sold separate from pump? It may not be available separately. Remove belt and turn the pulley by hand and watch pump shaft...

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.