Skip the auto shop - Our mechanics make house calls

Q: My car keeps running hot then it cools down

asked by on

My temperature gauge on my car will run cold, then hot, then cold again.

My car has 181523 miles.
My car has an automatic transmission.

A: Hi, thanks for writing in. There are two po...

Hi, thanks for writing in. There are two possibilities here: either the physical temperature of the engine is indeed fluctuating significantly, or the sensor and/or circuit that feeds the temperature gauge is malfunctioning. The sensor (and circuit) can be tested and, if necessary, a temperature data logger can be deployed to measure the engine temperature over time to see if the temperature is in fact fluctuating. If it is there could be an issue with the cooling system thermostat, water pump drive belt, radiator blockage and/or a malfunctioning cooling fan. YourMechanic would be pleased to evaluate the issue for you and identify the cause of the problem, that is whether it is electrical or something else.

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

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: Need a transmission

Hello. I will help you with this issue. The Chrysler OEM re-manufactured transmission for your car (assuming it is NOT 4WD) is Chrysler part number R5138422AE. My understanding is that transmission includes the torque converter (for many reasons, you cannot...

Q: The coolant in my reservoir tank is hot and bubbling but i just my head gasket fixed a month or so ago. And while driving it gets

You should have the cooling system pressure tested to see if the system can hold pressure or the head gaskets are leaking again. The cooling system can be tested to see if combustion gases are getting by the head gaskets...

Q: Car oil leak

Have an experienced technician inspect the vehicle to find the leaking component. In some cases, it is required that the area is cleaned if multiple leaks are present or the area is too dirty to pinpoint the location of the...

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...
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.