Q: Temperature gauge goes up and down

asked by on October 01, 2017

I was drag racing for a while, then when I parked my car, I noticed that boiling water was falling from the car, quickly had a look at the temperature gauge and I can see that it reached 3 quarters.

Then I took my car to the fuel station and I requested somebody to put water to the water container ( linked to the radiator) , then steam and pressure started to release, however when he opened it, water level was not low, it was above half the container.

I had a look under the hood and I can see that the fans are cooling very well.

Then I returned home and on the way, the heat gauge goes up and down. regardless of the situation. I tried the following scenarios:

  • Flooring the gas pedal
  • Stopping the car
  • putting the AC on
  • going fast
  • going slow They don't really affect the fuel gauge and it just keeps going up and down ( doesn't reach MAX though.. it reaches to 3 quarters only)

However, when I set the cruise control and go in a fixed speed, temp gauge stays low

Car is overheating Inspection $79.99 - $99.99 Get a Quote

You’re probably low on coolant. Filling the reservoir doesn’t really do the trick for filling the cooling system. There is probably air trapped in the cooling system that needs to be bled out. You may be able to do it yourself without extreme measures. Starting with a cold engine, start the car and set the climate control to max heat. Take off the radiator cap and fill the radiator, not just the reservoir. let the car idle with the radiator cap off , adding coolant as the level drops until the engine is fully warmed up and the heater is blowing hot. This might take as much as half an hour. Then put on the cap and see how it does. If this doesn’t work out, contact YourMechanic. They will send a technician to your home or office to check out your overheating problem and let you know what it will take to solve it.

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

I have a code 0073 on a 2013 dodge journey. I checked under the hood and found loose wires where the sensor should be. Can I replace the sensor and wires? Where do they connect?

A.c blows cold air when stopped but after driving for a few mins it makes a hissing sound and blows hot air

It could be that the evaporator is freezing up. If the air conditioner works TOO well, ice can form on the evaporator core. When that happens the AC will blow hot air until the ice melts. There is supposed to...

Hi Jason. I just had my ac condenser and compressor replaced 2 weeks ago. My ac went out again and I am now being told it is the m

The manifold line is not normally replaced when compressor or the condenser is replaced unless a problem is noted. In order to replace it now you will need to get a quote from customer service to get estimate for the...

My car got hit on rear passenger side and when you reach 65 mph its like the back of car is hopping 2003 Nissan Altima

Hello. If this occurred right after being hit then you have an issue with the alignment being off. It is also possible that something was bent or got damaged but this type of inspection would be done prior to the...

Running lights won't turn off - 1990 Mazda B2200

It is possible that the electrical relay for the running lights, or the light switch itself, is stuck closed, or has burned contacts. A professional mechanic with good electrical diagnostic training, like YourMechanic, can diagnose this possible electrical issue and...

oil pump drive

Hello there, thank you for asking about your 1993 Pontiac Grand Prix. The pump is self priming. If the red Oil Pressure Warning Light is not on, there is sufficient oil pressure. When engines are assembled, the oiling system is...

Coolant is boiling

You need to check to see if the thermostat is opening properly and if the cooling fan came on. The upper and lower hose should be hot if it is open. If this is your first time running the car...

Using the 3 2 1 Gears in an automatic.

They are there for a reason. The transmission is controlled by a computer. It will not let you cause damage. You have to look at it from a perspective that it's there to prevent shifts, and not to force a...

What regular maintenance should be done on a car and how often? I want a schedule of things to do and check. Car is 7 months old.

New Cars typically do not require much maintenance in the beginning. As long as you change the oil when it is scheduled, your car should be okay. We recommend changing the oil every 5000 miles. Most cars now have a...

Related articles

A Buyer’s Guide to the 2012 Infiniti M
The The 2012 Infiniti M combines luxury, performance and value into a stylish sedan. With numerous standard luxury features and drive-enhancing technology, this is one car that is sure to impress any driver in a number of ways. Key Features...
How to Flush Your Cooling System
Flushing Flushing the cooling system is part of every vehicle's scheduled maintenance. This procedure is usually required every two to four years, depending on the vehicle. It is important to perform this maintenance at its scheduled time because the...
The Best Used Cars to Buy If You Like to Go Off-Roading
Your Your best bet for off-roading is a 4x4 SUV. Depending on the model that pleases you most, though, you might have to shop around a bit to find a good used one. That’s simply because off-roaders typically become very...