how to tell if my cars thermostat is bad
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How can you tell if you have a bad thermostat on a 1997 ford contour?   When the car is hot, squeeze the upper radiator hose. If it feels soft, then the thermostat is not opening and therefore bad. If you squeeze the hose and its hard to squ … eeze, then it is pressurized and the thermostat is open.That is one way to check if the thermostat is stuck closed.o test a thermostat remove it while the motor is cold and make sure it is not stuck open. If it is stuck open when cold it is faulty. If it it is closed put it in water on a … stove with a thermometer and heat the water.
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What Is Damaged in an Engine When It Overheats? However, low oil levels also increase friction between moving parts, resulting in too much heat. As soon as drivers notice a car's thermostat indicating high engine temperature, they should take steps to cool the engine. Turn off the air conditioner and open the windows to reduce the load on the engine.
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Dealership Charge for Thermostat Replacement Reasonable? If you get the code for coolant temperature too low or did not reach proper temperature in time, the troubleshooting procedures usually call for removing the thermostat and testing it in a pot of water. That would cost more than just replacing the thermostat.
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Car Thermostat Replacement - 10 Important Tips So, when replacing the thermostat 1  . . . 1. Wait for the radiator and engine to cool before attempting to replace the thermostat. 2  4. Use a six-point wrench or socket of the correct size when removing the two or three housing mounting bolts.
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Thermostat display goes blank and AC shuts off periodically This points to a bad thermostat. Try this: take the batteries out of the thermostat and turn the power to the furnace off for 30 minutes. Now replace batteries with fresh alkaline batteries and turn furnace power back on. Try again.
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- Key things to remember about hCG levels. In 85% of normal pregnancies, the hCG level will double every 48 - 72 hours.Click To Tweet. As you get further along in pregnancy and the hCG level gets higher, the time it takes to double can increase to about every 96 hours.
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How to Know If Your Car Thermostat Is Bad To actually test the thermostat, remove it from the thermostat housing in your car engine. To locate your thermostat, look to where the end of the top radiator hose leads on the engine.e sure the car engine and coolant is not hot when you drain the coolant. You may also disconnect the housing without first draining the coolant from the radiator, but you will need to be prepared to either absorb or catch the coolant, which is in the hose at the time, usually about 1 to 2 quarts.
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- Hi, Have been having problems with my MK2 GTI (80K miles, well looked after).. the coolant light comes on when in traffic, once on the move it clears. To test the fan I let the car idle today and once warmed up eventually the red blinking light came on.f the car is not using water, the cooling fan is operating and the temperature gauge reads normal, there is nothing wrong with the engine or your cooling system. The warning light has a control diode at the back of the dash that brings the light on and also operates a warning buzzer.
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- An engine without a thermostat will flow too much coolant and can erode the radiator and heater core. The increased velocity of the coolant flow can easily wear through the thin metal tubes. This is far worse in a dirty system, full of abrasives, from lack of care.
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- Repeat for the bottom radiator hose. 1  Both radiator hoses should be very warm to the touch. 2  If one hose is very hot and the other one feels cool or even cold to the touch, the thermostat is likely stuck in the closed position.
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Reasons Why Your Car Is Overheating 2b. Bad Radiator Fan Switch: There is a switch that tells your cooling fan to come on when your coolant reaches a certain temperature. The easiest way to test this switch is to disconnect the wiring harness and then run a jumper wire across the harness contacts. If the fan comes on, you need to replace the switch.
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- Technician A says that coolant flows through the engine passages and does not flow through the radiator until the thermostat opens. Technician B says that the temperature rating of the thermostat indicates the temperature of the coolant when the thermostat is opened fully.
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- 1 One way to check for bad plug wires is to inspect the plug wire runs with the car running in a very dark area. If the plug wires are bad you should see some arching to the cylinder head or fuel rail.  If the car idles rough or cuts off at low RPM or idle, the cause could be a failing O2 sensor.
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Should I Worry About How Hot My Engine Is Running? All vehicles also have a warning light that's supposed to come on when the engine exceeds its normal temperature (it also illuminates for a couple of seconds when you start the engine). Without a gauge, though, it's anybody's guess as to how high above normal the temperature is or how long it's been above normal. If a red or yellow temperature warning light comes on, assume the worst: get off the road, shut off the engine and call for help.
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Troubleshooting P0117 and P0118 ECT Sensor Tests (4.6L, 5.4L) Ford uses two different temperature sensors. One is called the engine coolant temperature (ECT) sensor and the other is the engine cylinder head temperature (CHT) sensor. This article concentrates on the engine coolant temperature sensor (see photo below). This DTC tells you that the PCM is seeing a coolant temperature of -46° F (-50° C). 2  This DTC indicates one of several things: 3  Coolant temp sensor's wires have an ‘open’ short (usually due to a cut wire). 4  Coolant sensor's connector has become unplugged from the sensor itself. 5  Coolant temp sensor is BAD. 6  PCM is BAD.
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- 5. Cancel. The most common cause for an overheating car is low antifreeze, but other causes may be a thermostat sticking or a slipping belt. Discover how sticking brakes can cause a car to overheat with help from an ASE-certified mechanic in this free video on troubleshooting car problems.. Cancel. The most common cause for an overheating car is low antifreeze, but other causes may be a thermostat sticking or a slipping belt. Discover how sticking brakes can cause a car to overheat with help from an ASE-certified mechanic in this free video on troubleshooting car problems.
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- I replaced the temp sensor but it turned out that it was not the sensor but the thermostat switch stuck open, hence coolant was constantly flowing through the radiator and keeping engine cold esp at speed. Changing thermostat is a cheaper part and even easier to replace on the 1.6 16v than replacing the sensor.i Folks,I seem to be having a few issues with the temp/coolant sensor in my MK4. Now I had the engine replaced in it about 4 or 5 months ago now with a lower mileage one.
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Car Thermostat Replacement Service The thermostat is responsible for determining when the coolant needs to enter the engine. The thermostat determines the temperature of the engine, and then acts as a valve that allows coolant in, or keeps coolant out.
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Why Does My Car Have No Heat? If you don't feel that trickle of heat, your heater core is not being included in the circulation of hot coolant when the engine is warmed up. First, check your coolant level to be sure there is enough coolant in there to even get to your heater core. If your radiator is very low on coolant, you'll get no heat. If your levels are ok, you either have a bad water pump or a thermostat that isn't opening. If your car has not been overheating or running hot, your water pump is not the culprit. It sounds like you are dealing with a failed thermostat.
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- TDI(s): 2005 passat bhw tdi (presently), 2001 jetta alh tdi (previously), 1998 jetta ahu tdi (previously). temp gauge reading. My experience with the temperature gauge reading being erratic or off center are basically twofold. One has to do with the coolant temperature sensor and the other with the thermostat.If the needle on the gauge does not reach operating temperature and the needle remains fixed in position, it has been the thermostat.(stuck open) (obviously if it would overheat-thermostat stuck in closed position).y experience with the temperature gauge reading being erratic or off center are basically twofold. One has to do with the coolant temperature sensor and the other with the thermostat. If the needle on the gauge does not reach operating temperature and the needle remains fixed in position, it has been the thermostat.
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- Greentech Automotive Auto Service and Maintenance Guide: ThermostatThe thermostat is a key part of your cooling system. Santa Rosa motorists' vehicle thermostats perform a similar function to the thermostats in their homes.At home, you set your thermostat to maintain a comfortable temperature range.t Greentech Automotive, we understand the importance of a safe, reliable automobile. When your car is out of commission, it can disrupt your whole life. When a customer entrusts us with their auto repair and maintenance, we take it very seriously.
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A/C Actuator Step 1: Identify which A/C actuator has gone bad by running your car's heater and air conditioning. Usually, the broken actuator will make one side operate properly, while the other side will fail. Step 2: Locate the driver side actuator, which is usually situated in the foot well at the back of the driver side lower floor panel.
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- Resistance at 20 deg. C (68 deg. F) should be between 2.3k and 2.8k Ohms. At operating temperature, 80 deg. C (176 deg. F) resistance should be 290-370 Ohms. It sounds to me like your coolant temp sensor may be bad if it was showing 925 Ohms dead cold. This would make the ECU think the car is much warmer than it actually is, and would not activate the cold start valve or idle control valve appropriately.
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Symptoms of a Bad or Failing Ambient Temperature Sensor (Switch) Inconsistent cooling. Another symptom of a bad or failing ambient temperature sensor is inconsistent cooling. As the ambient temperature sensor plays a direct role in the automated function of the AC system, when it is having a problem this may interfere with the system’s ability to cool the vehicle.
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How to Check the Thermostats and Fuse You should get a reading of either zero or infinity. At room temperature, the thermostats should have a reading of zero. When the thermostats are heated to their limit temperature, they should switch off and you should get a reading of infinity. The fuse should be tested at room temperature for continuity.
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- Open means your heater or a/c might not work at it's normal rate, but if it sticks closed you will soon be stopping (with a over-heating car) on the side of the road. Also, if you replace the thermostat, also replace the gasket. Papa-Yogi · 9 years ago. Thumbs up.