Follow the recommended mixture of antifreeze and water based on your car’s service requirements. If the engine starts to overheat, it’s best to replace the coolant. Because water can’t carry heat away from the engine as efficiently as coolant does, you could see unusual fluctuations in the temperature. Without enough coolant, the temperatures are going to increase. While some people mix water with the coolant, it’s important that too much doesn’t get into the system. If there is too much water in the cooling system, the temperature gauge can act strangely. RELATED: 5 Symptoms of a Bad Car Thermostat 2. You may also have trouble getting heat out of the HVAC system. If the thermostat is stuck open, engine temperatures are going to drop below normal. When the thermostat is stuck closed, the coolant isn’t able to flow, meaning the engine won’t be able to cool off. Once it goes bad, it will no longer act this way. If it starts to fail, it can act erratically, causing the gauge to jump up and down. The thermostat is used to regulate the temperature of the coolant. Here is a more detailed list of the reasons why your car temperature gauge goes up and down: 1. On the other hand, it could be due to a defective coolant temp sensor or a bad temperature gauge It’s also possible that there is air in the cooling system. The temperature gauge can fluctuate up and down because of a bad thermostat or a lack of coolant. Sources Reasons Why A Car Temperature Gauge Goes Up And Down
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