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: radiator and overflow full, car is steaming but not overheating according to indicator gauge. can i drive it?

Hi Ronda. Thanks for contacting us today. It's quite possible that your thermostat or coolant temperature sensor is what is causing this issue. If the gauge is malfunctioning, it will cause the coolant to run hotter than it should, creating...

Q: When I put it in reverse it is stalling

If you car only stalls when you shift into reverse and not when you shift to any forward drive gear, then you may have an internal leak in the valve body and when you shift into reverse, the transmission is...

Q: Jeep won't shift from second to third

The information provided for your Jeep Grand Cherokee is limited so it is difficult to point you in the right direction. However the symptoms lead me to believe that your vehicle may have put itself in “limp mode”, meaning 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.