Click here for our COVID-19 protocols. The most common signs of a bad or malfunctioning thermostat are lack of hot or cold air when the device is turned on and an unlit display light. Affiliate Disclosure:  We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. These 3 symptoms of a bad thermostat can cause major problems. Here are some of the most common symptoms of a bad wall thermostat. Larry Clements. 1. The Check Engine light may come on too. Click here for our COVID-19 protocols, as the health and safety of employees and customers is our top priority. The stagnant engine will make the machine work very heavy and incomplete combustion. This condition will make the use of your coolant to be very wasteful. How cool is that? Regular checking is the wisest step that car owners should take. It may occur because the blower fan is sluggish, the air filters are dirty, or you may have unknowingly blocked the ducts with furniture or potted plants. Symptoms of a bad thermostat can be divided in two types: Thermostat stuck open: When the thermostat is stuck open, the engine temperature drops below normal when driving, especially on the highway in cold weather. Why is indoor air so important that it deserves its own month, you ask? The first and potentially most alarming symptom will be the temperature gauge reading high into the redwithin the first 15 minutes of your vehicle engine running. A stuck-open thermostat can also cause lack of heat from the heating system. If the thermostat is stuck closed, antifreeze won’t flow from the radiator, resulting in the car overheating. Of course, your first response to an unresponsive thermostat would be to change the batteries. Neither overheat nor under heat equally do not produce good combustion so engine performance will obviously drop. Are you ready for winter to be over? This is why it’s important to know the signs of a bad car thermostat that isn’t working how it should. Thus, if this happens, one of the possible c… If correcting the settings doesn't fix the problem, it's time to look for other causes. You should also know (at least a little) about the important things about your car. Conclusion: Outback Bad Thermostat Symptoms. Learn more at https://www.theyesmancan.com/nest-thermostat. Replacing a thermostat is a relatively affordable repair. Signs of a bad thermostat Now you fully understand what the thermostat is and how it works, it is important to maintain a perfectly working thermostat to avoid complete engine failures. Another sign that your thermostat is bad is when the system won’t turn off. To assume the worst in one go is foolhardy. If you’re in the market for a new thermostat, you may want to look in to switching to a smart thermostat! Common Signs of an Impending Water Heater Failure, Four Things to Avoid Putting Down the Garbage Disposal This Thanksgiving, Our Most Frequently Asked Plumbing & HVAC Questions: Answered, Signs It’s Time to Upgrade Your Heating System, Why a Nest Thermostat is Worth the Investment. In this section, we will provide you with an overview of the most reported signs of a bad thermostat. However, it could also be a simple wiring issue or the thermostat may just need new batteries. As your water heater ages, it is normal…, 6275 South Pioneer Way Another symptom may be leaks near the thermostat housing. An overheated engine is the most concerning symptom of a bad car thermostat. Fixing a bad thermostat. Temperature gauge reading … Mismatched temperatures may be the root of a ductwork issue. The symptoms give you a warning in advance so that you can take the necessary precautions. 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