Let's find out. Solution: In case of a recently installed new thermostat: carefully remove, check and re-install the thermostat.Strictly follow the torque specifications. Answer: If the coolant level is OK, and the engine is not overheating, check the coolant level sensor. This acts as an obstruction for the flow of the air. Troubleshooting the Furnace. Dan Ferrell (author) on January 28, 2019: Most likely the overheating is because of the leak. What do you suggest the problem is? If your engine is still overheating, you have another problem affecting the cooling system. If you need help to locate the thermostat, consult your vehicle service manual. Dan Ferrell (author) on September 27, 2017: Make sure you bought the correct thermostat for your make and model. Some theremostat-housing come as a single assembly, so you need to replace them together. First, ensure the power is turned off, and then remove the cover of your thermostat. Start heating the water and place the kitchen thermostat in the pot, but don't allow the thermostat to touch the pot. Solution: Your mechanic can test the thermostat and replace it if necessary. Using needlenose pliers, hold on to the thermostat and place it in the heated water. Want to save on an expensive car bill? Both hoses should be warm to hot. On the other hand, a thermostat stuck in the closed position will prevent coolant flow and cause the temperature to steadily rise. What could be wrong with my temperature gauge? If you touch the upper radiator upon starting the engine, it feel cool. Other times its batteries are dead. He has certifications in automation and control technology. If either of your tests points to a bad thermostat, follow up with the third procedure below, How Do I Test a Car Thermostat, to test it outside of the vehicle and make sure you need to replace it. Thermostats regulate your furnace and central air conditioning system. Answer: If the thermostat housing is worn, damaged (cracked) or has beginning to leak, it's better to replace it. Now that you have an idea of how the thermostat operates, you can use that knowledge to investigate the problem. I did however notice there seemed to be a lot of pressure building up in the coolant reservoir (there is no radiator cap), and the radiator fans run on and off all the time (sometimes only turning on for a second or 2). If the thermostat sticks in the open position, it doesn’t keep the liquid in the engine long enough, so you have trouble getting your car warmed up. You'll need to replace the head gasket. Some fluid will escape, so have a clean two … Otherwise, check that the fan for the condenser is working fine when turning the AC. What do you think the problem is? The thermostat manages the amount of coolant that is distributed through the engine. The coolant tester will determine if the coolant is able to do its job and not freeze inside the system when ambient temperatures fall below 32F. What you want to avoid is engine overheating. Let’s find out. Have you checked that yet? Answer: There could be a problem with the water pump. When set to Auto, the thermostat automatically selects heating or cooling depending on the corresponding indoor temperature. Remove the cover off the thermostat. Make sure the tank's cap is working properly and venting. Answer: Remove the radiator cap and pour the coolant through the opening. Almost all thermostat problems, will have some effect on your engines performance. Check your vehicle repair manual for the thermostat operating range, and make sure you have the correct one for your application. Consult your vehicle repair manual. Part 2 of 4: How to tell if the thermostat is faulty Step 1: Check your gauge. Question: after how many miles should a thermostat be replaced? It's seems so basic, but thermostats are a very important part of your cooling system. This Home Depot guide will teach you how to tackle a thermostat that is not working and other basic thermostat troubleshooting. This time the temperature warning light came on and then turned off, so I kept driving (not knowing the pipe burst). Whit a stuck open thermostat coolant wont get a chance to get hot. Question: I just replaced my thermostat and now my car is over heating, and it wasn't doing that before. Corrosion can and will prematurely aid in cooling system failure, specifically the water pump, radiator, heater core, and finally the thermostat. So, it's not a good idea to run an engine without a thermostat. Question: Where do I put the coolant in my car? Your thermostat switches to and from Eco Temperature unexpectedly: If you see one or more of the symptoms listed below, please go to Troubleshooting automatic home and device switching. Then, locate the thermostat. It should be set to AUTO, which means the blower will only blow air out the vents when the air conditioning or furnace cools and heats the air respectively. This means the thermostat is opening. Go to your local auto parts store or order online. Question: I have a Toyota 80 series Cruiser. Learn how to interpret CB talk here. If you follow the upper radiator hose towards the engine, you will see the end of this hose connecting to the thermostat housing. I also flushed out the heater core. If you’ve noticed these symptoms, consider replacing your thermostat with a new one from O’Reilly Auto Parts. Every time temperature is abit cold the engine will just die. After a few minutes, take your multimeter, set it to DC voltage and place the negative probe on the negative battery terminal. This is the photo of a thermostat housing in the Dodge Charger SRT Hemi engine. Under-performance of cooling or heating systems are mostly due to problems in the thermostat. The coolant shouldn't be flowing because the coolant has not reached enough temperature to cause the thermostat to open. Too much water being present in the system can cause rust. Here I give you all the lessons I've learned so you too can make a nice weekly or monthly profit and have fun learning to flip cars for a living. Question: My 2003 Hyundai Sonata runs great, but the temperature gauge is always in the middle of cold and hot. What could the issue be? However, if the coolant begins to flow but the engine still overheats, you have another problem affecting the cooling system. If coolant doesn't flow, you'll notice the temperature on the upper radiator hose remaining about the same, and the temperature gauge on your dashboard getting close to the red zone. Good article. When you see the needle reaching the red line, pull to the side and wait for the engine to cool, if necessary. The thermostat in your clothes dryer is an important component to the unit. If it does not open or starts to and stops, this thermostat has failed. Proper maintenance helps prolong the useful years of your car. With Bar's Leaks I don't think there will be any damage to the thermostat. Thus, the thermostat is small, simple and effective. I'd and use William again. Check your thermostat’s batteries. I checked the radiator cap on it. It's seems so basic, but thermostats are a very important part of your cooling system. Hope this helps. Do a compression test, even a vacuum test can give you valuable information. Determining There is a Problem Keep an eye on the temperature gauge. If the hoses' temperature have remained about the same, the thermostat is stuck closed. Will this cause problems as the winter sets in? I took out a thermostat and travel without it and the engine was cool. The thermostats purpose is to keep the engine at its proper operating temperature. You can find in your vehicle repair manual. Start your car and allow the engine to run at idle. Whatever its failing state, you'll find out in a few minutes using one or more of the tests described in this guide. Is it overheating? The main reason to drill a hole in your thermostat is to keep your car cooler by controlling the KR. Hi Dan, thanks bucket loads for your article! Generally, if your vehicle is overheating within 15 minutes or so of driving it, this may be a sign that the thermostat is stuck. If necessary, use your car's VIN number to avoid any confusion. If I had a smaller thermostat put into my truck what would it do? Thermostats are quite easily and cheaply replaced so rather change them if there is doubt. Check the troubleshooting section of your vehicle repair manual to see other causes for engines overheating. The thermostat opens and closes several times while the car is running. Or failed pump? My question is: Could this build up in pressure be due to a faulty thermostat? Once the engine reaches the right temperature, the thermostat opens, allowing coolant to circulate freely. Step 2: Heat a pot of water. Other possibilities include a cracked head or block. Very well written and easy to follow! A properly maintained cooling system will help extend the life of the thermostat, but it will also help maintain the other supporting components as well. At this time, hot coolant causes the thermostat to open. Open the hood of your car and remove the radiator cap. The stock thermostat is designed to start opening at a minimum set temperature, not at a maximum, so you get the engine overheating protection its needs even at high loads. If you take another temperature reading on your two test points, you'll notice the radiator hose temperature almost as high as the engine’s temperature. A properly and routinely maintained cooling system will have a smaller chance of its thermostat getting stuck closed. As soon as the engine gets warmer, the thermostat opens and allows coolant to enter the engine. Did you replace the coolant recently, or when replacing the thermostat? Why Drill Holes in your Thermostat? For A/C troubleshooting, it is necessary to understand and solve these issues at the earliest. How Often Should the Ignition System Be Inspected? Question: Why am I getting water in my spark plugs on my 2001 Ford Expedition? The valve itself operates through a wax-container element. Check the thermostat to make sure it's working or not working. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters. For a mechanical thermostat with a mercury switch (a small vial filled with mercury), first use a small torpedo level to make sure the thermostat is mounted level on the wall. A manual will help you to define the problems and possible reason of failure and fix the technical issues on your own. Sharing it as well. Thank You!! Does your car overheat only at idle, while in town - how about at highway speeds? You should notice the hoses' have risen in temperature. With the help of Lux thermostat troubleshooting guidelines, you will be able to reset and repair your home appliance properly. It can rhyme and convey both compliments and insults. As the coolant temperature rises, the fluid (or wax) in the container begins to melt and expand, pushing a small rod that separates a center plate from its surrounding mounting base to open the valve. A few months back I noticed my cars radiator fan would keep running once I reached my destination after a long drive (it never really did this before). Is the thermostat replacement necessary? If it is opened, replace it. Set the switch at the top of the thermostat to COOL and the fan switch to AUTO. 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