![]() ![]() Replace Temperature Gauge Sensor or Gauge RELATED: How to Bleed Your Cars Cooling System (9 Easy Steps) 4. Do this until the temperature stops fluctuating. Loosen up the bleed valves and rev the engine a few times to circulate the coolant. Start the engine and turn the heat on high with the fan on low.Ĭontinue topping off the coolant as the levels drop. Take off the radiator cap and fill it with coolant as much as you can. You can also bleed the cooling system if you notice air getting trapped. Put fresh coolant into the system, mixed as recommended by your automaker. Shut off the engine and drain the dirty water from the system. However, this is another job that can be done at home.ĭrain the radiator and fill it back up with distilled water. Fill Cooling SystemĪ professional coolant flush will cost between $65 and $150 on average. You can now put on the new thermostat, replace the parts, and fill the system back up with coolant. Remove the old thermostat and put a new gasket in place. Remove the clamp and catch the coolant in a bucket underneath. It is probably located where the top radiator hose joins the engine, but it could also be on the bottom hose. However, it’s not a difficult job to do yourself. On average, you will spend $125 to $300 to replace the car thermostat. How to Fix Fluctuating Temperature Gauge 1. However, if the module is going bad, you may also notice other strange issues, as this part is used to control many different systems. It’s the module’s job to relay data that moves the temperature gauge. This part is needed to communicate data from the engine and other systems in the vehicle. If you are noticing that the temperature gauge is acting erratically, it could be due to a bad computer module. It can also cause erratic readings if it is working intermittently. If the sensor gets damaged or corroded, it could send the wrong signal. This part is found in the engine, and it can become contaminated. It’s more likely that the faulty readings are coming from a malfunctioning coolant temperature sensor (CTS). RELATED: Temperature Gauge Stays On Cold? (Causes & How to Fix It) 5. Take a look at the other gauges to see if there’s an electrical fault. Often, when the instrument cluster is having issues, you will see other problems. The instrument cluster isn’t the first thing to look at, but it always is a possibility if you can’t find anything else that’s wrong. It’s always possible that the temperature gauge itself is to blame. Once it starts moving again, the engine temperature can return back to normal. When the air pocket holds back the coolant, the engine will start to overheat. It can also infiltrate because of a leak in a radiator hose or improper procedures taken during a coolant flush. Air gets into the system through a defective radiator cap or blown head gasket. If you are noticing the temperature gauge drop down at times, it could be due to air in the system. RELATED: Low Engine Coolant Level? (Causes & Consequences) 3. 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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