Temperature gauge on dashboard

temperature gauge on dashboard raises rapidly to Midway then full blown hot and back to Midway again I have already change the water pump and the temperature valve what do I do next?
My car has a manual transmission.
Experienced mechanics share their insights in answering this question :
Hello, thanks for writing in about your Mazda B3000. This may be related to a number of things outside of the thermostat and water pump such as a faulty cooling fan relay and/or fuse, a clogged radiator, or potentially even a blown head gasket. I would recommend having an expert from YourMechanic come to your home to diagnose your cooling system.

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The temperature gauge, most often located on your dashboard in your vehicle, is intended to show the temperature of your engine`s coolant. This indicator will let you know if your engine`s coolant is cold, normal, or overheating.
The most common reasons for your car temperature gauge going up but not overheating are due to temperature sensor failure, a broken temperature gauge, engine control unit failure, corrosion in connectors, or damaged wires feeding to the sensor or gauge.
Low coolant, a clogged radiator, bad water pump, and a handful of other things could all be a potential issue. Replacing a thermostat is much easier than replacing an engine, so keep an eye on your temperature gauge.
A temperature gauge is a device used for the accurate measurement and reading of temperature gradient. The term temperature gauge usually, though not always, refers to a device showing readings on a numbered dial. Dial thermometer gauges are often found in industrial and commercial settings.
If you notice that your engine overheats, the coolant temperature sensor could be the problem. At times, the coolant temperature switch may fail such that it starts transmitting hot signals permanently. This causes the computer to erroneously counterbalance the signal, thereby causing the engine to misfire or overheat.
Temperature Gauge

Your temperature gauge is found in your `car`s instrument cluster. You should be able to pick out the gauge from its defining symbols – a thermometer and the letters “H” and “C” for hot and cold. You may see the gauge fluctuate a little, depending on the day.

Most cars these days have 2 sensors: one inside and one outside. The sensor that measures outside temperature is typically up behind the bumper, which is near the hot asphalt and the engine. That`s why it reads a little higher that what the temperature actually is outside.
Temperature Gauge

Your temperature gauge is found in your `car`s instrument cluster. You should be able to pick out the gauge from its defining symbols – a thermometer and the letters “H” and “C” for hot and cold. You may see the gauge fluctuate a little, depending on the day.

Temperature Warning Light/Gauge: this light goes on when the engine temperature or the radiator`s coolant is too hot. In some vehicles, a gauge is used that would show the needle in the warning zone of HOT. If this warning light comes on while driving, STOP as soon as you can at a safe place and shut the engine off.
The gauge is located by the top of your vehicle`s dashboard and measures whether your engine coolant is cool, normal or overheating. Other than normal, a measure of cool or overheating on your temperature gauge is important and can be indicators of the condition of your vehicle.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Gas gauge isn’t working. Sometimes the speedometer and the temperature gauge doesn’t work. Limited lights around gauges and radio.
ANSWER : Hi there. The dashboard lights are burned out in the dash and the dimmer switch could be worn causing the lights to be weak. The gauges that seldom fail to work is most likely a loose wire in the dash panel. The fuel gauge that is not going to E when shutting off the car has a damaged rheostat within the sending unit. The sending unit is in the fuel tank attached to the fuel pump. If you need further assistance with your gauges not working, then seek out a professional, such as one from Your Mechanic, to help you.

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Temperature gauge does not work – 1998 Mercury Grand Marquis
ANSWER : You will need to test the computer to scan for data of the temperature sensor to see if the computer is reading the correct temperature as tested externally on the coolant sensor. If the sensor is not accurate then replace the sender. If the sender is accurate then you will need to have the temperature gauge replaced.

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My temperature gauge keeps making it look like my car is overheating the temperature gauge moves up to the red. I already changed the thermometer
ANSWER : Hey there. Your cooling system consists of several components. Thermostat, radiator, heater core, and water pump are just a few. Since the thermostat has been replaced, it is more than likely not the cause of the engine running hot. If any part of the cooling system like the radiator or heater are clogged, coolant will not circulate thought the system properly.

If the water pump is damaged internally – the impeller separated from the shaft or fell apart – this also could cause the coolant flow to be stopped. Other cooling system components, such as a bad radiator fan motor, relay, or coolant temperature sensor which sends a signal to the radiator fan to turn on can be at fault. Also, a leaking head gasket can cause the engine to run hot. Have a certified technician diagnose the running hot condition before replacing parts that may not solve the problem as that can become costly.

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I have a problem with the temperature gauge – 2002 Buick Rendezvous
ANSWER : Hello. The temperature gauge is going to elevate based on the resistance of the sensor. The first thing to check is the temperature sending unit. The wires or the sensor itself may be corroded or damaged. This would cause extra resistance in the system and cause the gauge to be off.

You can test the readings coming from the temperature sensor. You will want to test for resistance and match it to the correlated temperature. You can find these specifications based on make and model. This would inform you of what the gauge thinks the temperature is versus what the scanner is reading. If they are off, then you know the sensor is bad and you should replace it. The sensor will signal the computer as to when the fans should be turning on. If the fans are not turning on soon enough, this would be the cause.

I recommend having a certified mechanic, such as one from YourMechanic, come to your location to determine if the gauge is faulty and replace the temperature sending unit if necessary.

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Dashboard gauges don’t work
ANSWER : There is still a ground path problem from the engine to the instrument cluster, whether through the chassis or not. Might be worth running a new ground wire directly from the engine block to the ground connector on the instrument cluster in the dash. If you need help having this done, have a certified technician, like one from YourMechanic, inspect the electrical system and resolve the issue.

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How do I get the maintenance required light to stop blinking and my temperature gauge to be normal?
ANSWER : Hi there, thanks for writing in. The Toyota maintenance light is a reminder to get your oil changed. This light comes on periodically and needs to be reset with every oil change. As for the temperature gauge this is normal. The engine is cold when it is first started so it reads like this and as it runs it warms up and the gauge starts moving. This is normal. I would just have your oil change done when you get a chance. If you want to have your oil changed, consider YourMechanic, as a certified mechanic can come to your home or office to do this.

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Fuel gauge and temperature gauge not working.
ANSWER : The fuel gauge not reading properly may be likely related to your fuel sending unit or the gauge in the dash itself. The sending unit is a small float type component inside your fuel tank that measures the level of the fuel inside the tank. As the fuel level drops, the float level changes and sends a signal to the car’s computer which then displays the reading on the fuel gauge in your dash.

The temperature gauge also has a sensor (or in some cases called a switch) that reads the coolant temperature and relays this information to the ECU which uses this information to control other functions such as the air/fuel ratio during warm up. This also serves to control the turning on and off of the cooling fans when the temperature reaches a specific threshold. When this is not working properly, you may also experience the engine overheating in some cases. I would recommend having an expert from YourMechanic come to your location to diagnose and repair your gauges.

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Problem with the coolant temperature gauge.
ANSWER : Hi there. The temperature gauge is not grounding out to the vehicle chassis. Try putting an additional wire on the housing of the temperature gauge and grounding it to the chassis. If this has no effect, then the gauge is not working and would need replaced. If you need further assistance with your temperature gauge, then seek out a professional, such as one from Your Mechanic, to help you.

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