Skip the auto shop - Our mechanics make house calls

Q: Temperature gauge goes up when driving and down when not

asked by on

We got on the freeway and noticed that the heater wasn't working and the temp guage was getting hot and went all the way up we pulled over and put antifreeze in and made sure there was oil. When we would drive it would go up when we stopped at a light it would go down. We noticed antifreeze had leaked out somewhere under the hood probably when it went to hot.

My car has 199000 miles.
My car has a manual transmission.

A: Hello. This suggests you may have a faulty ...

Hello. This suggests you may have a faulty coolant fan relay switch. This is a relay that triggers the cooling fans to come on at predetermined temperatures. When this is not working properly, this can cause the fans to come on intermittently, all the time, or not at all. When they do not come on at all, this will cause the motor to get hot, especially while sitting at a stop since there is no air flowing past the radiator or engine. As you speed up, the air from the speed of the wind will cool it down slightly which is what you notice when your gauge drops. I would recommend having an expert from YourMechanic come to your home to diagnose the overheating issue and let you know what needs repair.

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: The temperature gauge is low and the engine does not get enough power

The issues you are experiencing can be caused by a few different things. One common cause is an issue with the engine temperature sensor. If the sensor goes bad it may not give the computer an accurate signal, which may...

Q: Loud knocking from motor that randomly started while driving down the road at 45 mph.

If the oil is not being consumed, it will turn black due to heat and carbon buildup. If the oil passages were dirty with carbon and other buildup, then the new oil acts as a detergent and will pick up...

Q: How can I find out what exactly is happening in my misfire?

Hello there. Misfires are a common problem with your 1997 Subaru Impreza as the vehicles ages. The most common failures are the spark plugs, coil, plug wires, fuel injectors, fuel pump, vacuum leaks, or an oxygen sensor. You have done...

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 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...
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...