Best answer
The yellow line is the engine temperature. ... If a thermostat was stuck open, the lower radiator hose would start warming up as soon as the engine is started. If a thermostat was stuck closed, there would be no flow even after the engine reached the operating temperature, and the lower radiator hose would remain cool.
Can a stuck open thermostat cause coolant loss?
A thermostat stuck in the open position constantly pushes coolant into the engine and causes a lower operating temperature. ... This will reduce engine efficiency and increase emisssions over time, as well as accelerate the deterioration of parts.
Can a stuck open thermostat cause rough idle?
Yes, if the thermostat is stuck open, the engine may not reach normal operating temperature, and it might idle faster than it should, but it should still idle smoothly, unless there is an additional problem. Most cars idle faster when the engine is cold. ... Can a thermostat cause a check engine light to come on?
Can a thermostat be partially stuck?
Thermostat valves can fail in one of three ways: open, closed or stuck halfway. If the valve sticks in the closed position, coolant will constantly recycle through the engine without going to the radiator, causing the engine to overheat.
Is it OK to drive with a thermostat stuck open?
If you are driving your vehicle and the thermostat is stuck in the open position, it's definitely going to cause some problems for you.
When your thermostat is unable to properly close when it needs to, the flow of coolant will be unrestricted throughout your engine..
What does a stuck closed thermostat look like?
Look to see if the coolant is swirling/flowing immediately — that means the thermostat's stuck open. If the coolant doesn't flow after 10 minutes or so and continues to be stagnant after the temperature gauge indicates it's hot, the thermostat's likely stuck closed. Replace the radiator cap and turn off the engine.
What happens if my thermostat is stuck open?
Thermostat stuck open: When the thermostat is stuck open, the engine temperature drops below normal when driving, especially on the highway in cold weather. A stuck-open thermostat can also cause lack of heat from the heating system. The Check Engine light may come on too.
What does warm yellow undertone mean?
If your face looks more yellow, your undertone is warm. If you feel you look better in off-white or creamy hues rather than stark white, that's another telltale sign that you may be warm-toned. If you can wear both colors without feeling like you look washed out, you may have a neutral undertone.
How long can you drive with thermostat stuck open?
Open is fine as others have stated, the only thing is that since your car will not reach the ideal operating temp, (yes, you can overcool a car) your gas milage will take a hit becuase the ECU thinks the engine is still trying to warm up. my friend drove his car for 4.5 YEARS with stuck-open thermostat...
Will a thermostat cause a car to overheat?
Overheating. Because your thermostat controls temperature of fluids from the radiator hose, a bad thermostat will cause your car to overheat. ... If the thermostat becomes stuck in the closed position, antifreeze doesn't flow from the radiator, causing overheating.
Can a bad thermostat cause transmission problems?
If the thermostat is stuck open Temperature gauge reads lower than normal. Heater doesn't work. Automatic transmission has trouble shifting into higher gears. Fuel economy drops noticeably.
Related Question Answers

BlivetWidget
ProfessorCan you drive with thermostat stuck closed?
A vehicle can run just fine if the thermostat doesn't open. It will run on the warm side, not past halfway, and heat the interior just fine. But, when the weather gets warmer outside that thermostat stuck closed will not be able to allow the reservoir water flow and the vehicle will begin to have overheating issues.

amit
ProfessorWhat colors look best with warm undertones?
The best colors to dress warm skin tones richly reflect nature. Go for brown, ivory and yellow-green. Reds, corals, ambers and golds also look stunning. If you are going for a cool-toned look, try warmer versions of cool colors like olive, orchid and violet-red.

Jakuje
ProfessorWhat does warm skin tone look like?
If you have warm undertones, your skin will lean peachy, yellow, or golden. ... You (usually) can't simply look at yourself and just know that you have a medium skin tone with red undertones or a deep skin tone with yellow undertones.

Anatolii Chub
ProfessorHow does a thermostat go bad in a car?
Why Car Thermostats Fail. Car thermostats fail when the valve of the thermostat fails to open, fails to close or gets stuck in a partially-open position. As the thermostat controls the flow of coolant to the engine, this can keep the car from warming up or cause it to overheat.

serv-inc
ProfessorHow do I know if my dishwasher thermostat is bad?
Look for a reading of infinity. Hold the thermostat next to a hot lamp. The reading should drop to zero. Test the limiting thermostat, which may be at the right side of the tub, similarly, but look for a reading of infinity at room temperature, and zero beside a hot lamp.

thebluephantom
ProfessionalWhat does a thermal fuse look like?
Thermal fuse shapes and sizes vary. Some are made from plastic; others are metal. Look for a small device about the size of a quarter to about 2 inches long, mounted directly on top of the exhaust duct. A thermal fuse has two wires connected to it.

ReynierPM
ProfessionalWhat thermostat is better than nest?
(If you have a two story house or a basement you might want to look at an Ecobee thermostat, which comes with remote temperature sensors.) It works just as good as the flagship Nest Thermostat, it's cheaper, and the features it is missing are inconsequential at best.

Hasan A Yousef
ProfessionalWhat Colour hair suits warm skin tones?
Earthy or autumnal colours like yellow, orange, red, olive green and cream or off-white look best on those with warm skin tones.

Jared Rummler
ProfessionalWhy does my thermostat keep going blank?
The first possibility to look into when you find a blank thermostat screen is to check if the unit needs to have its batteries changed. Not all thermostats use batteries; many are wired into the electrical system of the house. ... One of them might have tripped and cut off the power the thermostat. Reset the breaker.

Serge
ProfessionalWhat does warm blue look like?
Warm blues are those with a purple bias rather than a green bias. They will appear to come forward in a painting, whereas cool blues will recede. ... Examples of warm blues are Ultramarine and Indanthrone Blue. Cobalt Blue is almost a primary blue but it is also included here.

Daniel C. Sobral
UserDoes a bad thermostat affect air conditioning?
Normal Interaction. Under most circumstances, a bad thermostat will not have any effect whatsoever on the air conditioning system. ... A stuck-open thermostat will constantly send coolant through the radiator to cool, meaning that the coolant -- and thus the heater -- may never reach its full operating temperature.

Lukasz Wiktor
UserWhy does the fan run when thermostat is off?
Here's what they may find: Stuck Relay – Relays in your air conditioner unit help open and close electrical circuits to turn components, like a fan, on and off. ... Malfunctioning Thermostat – A faulty thermostat can cause your AC fan to run constantly by not knowing when the desired temperature has been reached.

maytham-ɯɐɥʇʎɐɯ
UserWhat happens when car thermostat fails?
Thermostat failure signs. ... If the thermostat becomes stuck in the closed position, the circulation of the coolant is blocked so the coolant cannot get to the radiator to be cooled which causes the engine to overheat.

Abhinav
UserDoes black hair look good on warm skin tones?
Cool black hair colors like espresso, licorice, blue-black or true black will look great on those with warm undertones. If you're fair or olive skinned, the contrast will take your yellowish undertones and give you an almost porcelain-doll look to your skin.

Christiaan Westerbeek
UserWhat does an old fashioned bed warmer look like?
A bed warmer or warming pan was a common household item in countries with cold winters, especially in Europe. It consisted of a metal container, usually fitted with a handle and shaped somewhat like a modern frying pan, with a solid or finely perforated lid.

RydallCooper
GuestHow do you identify thermostat wires?
Look at the labels where these wires connect to the control board to determine what each wire attached to your thermostat should be labeled. You may see labels like 1, 2, 3, 4, and A, B, C, D, or you may see no labels at all.

Mahmoud Gamal
GuestCan a stuck thermostat cause heater not to work?
If the thermostat stuck closed, the coolant engine will be overheated and self-destructed in a very fast time. In this case, there will be no hot coolant running through the heating core, and therefore, your heating system will only blow cold air.

Derviş Kayımbaşıoğlu
GuestHow do I find out what model Honeywell thermostat I have?
The fastest way to see your thermostat model number is to look for it on your thermostat ID card. If you do not have a product ID card, the fastest way to find the model number is by removing the thermostat from the wall-plate.

Dale K
GuestWhat does an electric water heater look like?
Electric water heaters look similar to their gas-fueled cousins. They both use an insulated storage tank jacket made of steel, with insulation between the storage tank and the tank jacket to reduce heat loss of the heated water. The main difference between electric and gas water heaters is the heat source.

Thierry Templier
GuestHow do I know if thermostat is stuck open?
Symptoms of a bad thermostat Thermostat stuck open: When the thermostat is stuck open, the engine temperature drops below normal when driving, especially on the highway in cold weather. A stuck-open thermostat can also cause lack of heat from the heating system. The Check Engine light may come on too.

Daniel Kivatinos
GuestWhat does a thermostat C wire look like?
Blue or Black – C – Common wire, may be unused by your existing thermostat. Enables continuous power flow from the Red wire. Red – R – 24VAC power from the furnace's transformer. Red – Rc – 24VAC (dedicated to heat call)

cuixiping
GuestWhat does it mean when your thermostat doesn't work?
The first possibility to look into when you find a blank thermostat screen is to check if the unit needs to have its batteries changed. ... If the thermostat runs from the house's electrical system, check on the circuit breakers. One of them might have tripped and cut off the power the thermostat. Reset the breaker.

JD Isaacks
GuestWhat causes a thermostat to fail?
There are two scenarios for failing thermostats: ... If the thermostat becomes stuck in the closed position, the circulation of the coolant is blocked so the coolant cannot get to the radiator to be cooled which causes the engine to overheat.

madlep
GuestWhat color suits warm skin tone?
The best colors to dress warm skin tones richly reflect nature. Go for brown, ivory and yellow-green. Reds, corals, ambers and golds also look stunning. If you are going for a cool-toned look, try warmer versions of cool colors like olive, orchid and violet-red.

Rafał Dowgird
GuestWhat does a warm blue look like?
Warm blues are those with a purple bias rather than a green bias. They will appear to come forward in a painting, whereas cool blues will recede. It is useful to have a warm and a cool blue in a split primary palette - when mixed together they will create a mid blue.

Gildas Garcia
GuestWhat does a warm skin tone look like?
Warm undertones tend to lean towards peachy, yellow or golden tones; cool undertones mean your skin has hints of pink, red or blue; while neutral is a mixture of these colours.

mob
GuestWhat happens when car thermostat goes bad?
A bad thermostat can stuck-open or stuck closed. A stuck-open thermostat can prevent the engine from getting heated enough to function properly. A stuck-closed thermostat is a much more serious case where the engine overheats quickly and might be self-destructed.

M. Deinum
GuestCan a bad thermostat cause a burning smell?
A stuck, open thermostat would not produce this scenario because the thermostat is supposed to be open at highway speeds. The burning smell through the vents indicates potentially serious damage to your engine. ... The excessive heat is burning oil, plastic, wiring, etc. in the engine compartment.

jtomaszk
GuestDoes Ash Brown look good on warm skin tones?
Ash tones work really well; you should avoid warmer blonde shades like copper, gold or caramel, since they can add a pink tinge to the skin (making you look more pink). ... If you've got dark skin with warm undertones, you should offset a soft honey blonde with dark roots; balayage or ombré hair colours are a great option.

JB-007
GuestHow can I tell if my thermostat is stuck closed?
If one (usually the top) is cooler, but the bottom is burning up, that indicates the thermostat is stuck closed as well. Do not stick your hand near the front of the engine while the fan and belt are moving, and never remove the radiator cap from a hot engine.

Ankit Bajpai
GuestWhat colors look best on warm undertones?
True white tends to favor cooler undertones, while warm undertones look better in off-white.
Warm undertones also tend to complement brown hues, while cooler tones look better in black.
Like jewelry, if you have neutral undertones, you can wear all colors with no effect on your overall look..

Nino Filiu
GuestWhat happens if the thermostat doesn't work?
Thermostats fail because they become weak, stuck open or stuck closed. When a thermostat is stuck open, coolant constantly circulates and the engine takes longer to reach operating temperature. This affects everything from performance to mileage to emissions and will ultimately take years off the engine's life.

David Schwartz
GuestCan a bad thermostat cause radiator fan not to work?
If the thermostat is stuck open (allowing coolant to flow) it can cause the engine to run cooler than normal so obviously the fan wouldn't come on.....but not like the engine/coolant can be running too hot and the thermostat somehow effects the sensor reading or operation of the fan.

kind user
GuestWhat does warm GREY look like?
Well, warm grays are mixtures of warm and cool tones, so that they are relatively warmer and more inviting. They generally have beige, brown and taupe undertones…as opposed to cool grays which have more blue undertones.

Mike Walton
GuestWhat happens when a thermostat fails?
If the thermostat becomes stuck in the closed position, the circulation of the coolant is blocked so the coolant cannot get to the radiator to be cooled which causes the engine to overheat.
....

Tim Schmelter
GuestWhat will a bad thermostat cause?
Overheating. Because your thermostat controls temperature of fluids from the radiator hose, a bad thermostat will cause your car to overheat. ... If the thermostat becomes stuck in the closed position, antifreeze doesn't flow from the radiator, causing overheating.

Šime Vidas
GuestHow do I know if my thermostat is stuck closed?
If you notice that the engine is hot but the radiator and the upper radiator hose are cool to the touch, there may be a thermostat issue.
Both hoses should be warm to hot.
If one hose is cold and the other hot, this is a good indication your thermostat is stuck closed..

Shaded
GuestHow do I know if my thermostat is stuck open or closed?
Check the radiator hoses for differences in temperature. If one (usually the top) is cooler, but the bottom is burning up, that indicates the thermostat is stuck closed as well. Do not stick your hand near the front of the engine while the fan and belt are moving, and never remove the radiator cap from a hot engine.

twasbrillig
GuestHow do I know if my thermostat is stuck open?
Symptoms of a bad thermostat Thermostat stuck open: When the thermostat is stuck open, the engine temperature drops below normal when driving, especially on the highway in cold weather.
A stuck-open thermostat can also cause lack of heat from the heating system.
The Check Engine light may come on too..

Serge
GuestHow do I know if my thermostat is stuck?
If you notice that the engine is hot but the radiator and the upper radiator hose are cool to the touch, there may be a thermostat issue. Both hoses should be warm to hot. If one hose is cold and the other hot, this is a good indication your thermostat is stuck closed.

Mitch Wheat
GuestHow does a thermostat fail?
Thermostats fail because they become weak, stuck open or stuck closed. When a thermostat is stuck open, coolant constantly circulates and the engine takes longer to reach operating temperature. This affects everything from performance to mileage to emissions and will ultimately take years off the engine's life.

RBarryYoung
GuestWill a bad thermostat throw a code?
The most noticeable issues occur when the thermostat gets stuck in either the open or closed position.
A malfunction can result in a trouble code, generated by the engine's computer, which can turn on your check engine light..

Diziet Asahi
GuestWill a stuck closed thermostat cause no heat?
A stuck-open thermostat can also cause lack of heat from the heating system. The Check Engine light may come on too. Thermostat stuck closed: When the thermostat is stuck closed, the engine might overheat. Besides these two cases, the thermostat may also need to be replaced if the thermostat housing is leaking coolant.

Nominal Animal
GuestWill a stuck thermostat cause overheating?
Your vehicle's thermostat opens to allow coolant to flow through the radiator and cool the engine down. However, if the thermostat gets stuck in the closed position, the coolant can't flow through the radiator and can make your engine overheat.

Yousif khalid
GuestWill heater work if thermostat stuck closed?
If a thermostat was stuck open, the lower radiator hose would start warming up as soon as the engine is started. If a thermostat was stuck closed, there would be no flow even after the engine reached the operating temperature, and the lower radiator hose would remain cool.

Donald Duck
GuestWill heater work if thermostat stuck open?
Answer: If the thermostat was stuck open the heater would eventually warm up. In between cold and halfway sounds like a fine engine temperature. This is more likely a problem with the heater core.

Hashem Qolami
GuestWhat causes a thermostat to get stuck closed?
Stuck open means too much coolant is being allocated to the engine, causing the engine to be abnormally cool. If the thermostat is stuck closed, that means not enough fluid is going into the engine and the engine will overheat.

Always Sunny
GuestWhat causes a thermostat to get stuck open?
If something goes awry in your engine, then it's possible your thermostat can get stuck in the open position. This could be caused by some kind of build-up of debris, grease, dirt, or some kind of corrosion that prevents it from closing properly.

Javaru
GuestWhat causes a thermostat to stick closed?
If the thermostat is stuck closed, that means not enough fluid is going into the engine and the engine will overheat.

Kaveh
GuestWhat causes thermostat to fail?
Thermostats fail because they become weak, stuck open or stuck closed. When a thermostat is stuck open, coolant constantly circulates and the engine takes longer to reach operating temperature.