The temperatur reading for my heater and a/c is digital with the automatic feature. It no longer read an accurate degrees. Please advise what the cause/solution may be and also, does that effect the operations of the heater?
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Re: Interior Thermostat Malfuntioning
Your problem isn't a thermostat. Your problem is a temprature sensor that I think is mounted in the section of the dash you are looking for. Call your local dealership parts department and it is probably gonna be a dealer part replacement anyway. I f you have found this helpful, please post as such. If you plan on taking it to your dealer, please post this as a fixya. TY
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If you have a temperature gauge on your dash you can read the engine coolant temperature. After overnight the gauge should be low and during about a 15 minute warm up cycle should achieve about mid range on the dash gauge. It should stabilize at this point with minimal fluctuation through out normal driving.
If you do not have a temperature gauge use an OBDII scan tool where you can read out the engine temperature as you would read the gauge.
A passenger can observe the live readout on the scanner that are equipped with such features while you operate the car.
Hi, if the temperature gauge read zero then the thermostat is gone.
If it's just no heat and the gauge on the dash is reading normal coolant temperature then it may be the Coolant Temperature Sensor. If the heater core was gone there should be a leak inside the car somewhere. Hope this helps
Are the hoses hot to the touch? If not, then check your cooling system for either air-pockets or blockages. If the main radiator is also not hot when running and if the temperature gauge is reading high, then change your thermostat.
If, as you say both hoses are the same temp and hot to the touch, then is the interior blower motor turning? Have you checked the condition of any interior cabin air filter? Also check that the heater matrix core hasn't been clocked up with dirty/fir/fluff etc.
Check your coolant level and make sure its full, next i would look into replacing your thermostat, if your thermostat is stuck open your engine isnt able to reach operating temperature therefore heater output suffers, your coolant temp gauge should read around halfway when the engine is hot if its not look into replacing the thermostat, if your gauge is reading halfway check the cable going to your heater box when you adjust your temperature on your heater controls its possible that the cable broke or the blend door inside the heater box is stuck into the cold position allowing only cold air to come through the vents.
if you have high miles, 75k or more I would go ahead and have tempature sensor and thermostat it self change. I don't see battery cable would have any bearing to the temperatureguage or cooling process. Both switch work almost the same, at time it work well other time it read or work incorrectly because it a sign of unit becoming faulty. If the temperature sensor is faulty half of the time it well give you incorrect reading however if the temp sensor working properly and the Thermostat is not, you will also get a high temp reading due to the Thermostat is not working properly allowing the hot antifreeze to flow out from the engine to the radiator which cause the hot antifreeze to be remain lock up in the engine block. Thermostat suppose to open and close when it reach its temperature; at the same time I would also replace thermostat switch which operate the cooling fan. all three tend to go bad over times; replacing all three is a great ideas. Thermostat, thermostat switch and temperature sensor.
it is possible the thermostat is the problem, but if it is stuck closed the engine coolant temp gauge (if you have one) would show an overheat reading. most temps gauges will read 195 to 205 degrees. the other possibility is if you have an automatic climate control system, the blend door motor may have failed and will not adjust correctly to the temperature you have set for the interior
This could be a cabin air temperature sensor. It could also be a failing air door actuator. If the interior temperature reading on the climate control panel seems to be accurate, the air door actuator is the more likely culprit. It is a small electric stepper motor which is more prone to wear than other components of the A/C system. The A/C control computer can also be at fault, but if it appears to read temperature accurately and doesn't flicker or show an error message, it is probably OK.