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Change your thermostat,The car is probaly over heating.You keep on driveing it when it does that. You will do serious damage to your engine. Is the check engine light on? Allso any other warniing light. While the car is in operation. Is there guages in the car? If there is keep a eye on your temperture gage if it is going into the hot zone, If it is your vehicle is over heating.
The temp gage is going up and down due to the lost coolant, this creates air bubbles that get around the engine coolant temp sensor, air doesn't transmit heat energy very well so the gage quickly drops. Have the cooling system pressurized with a special tool to locate the source of the leak. Common area of leak is the engine coolant pump driver shaft seal. Also look for white crusty looking stains, this is dried engine coolant.
It could be your thermostat. If it is stuck open and you are driving in cold temperatures your car will not warm up properly. As for your heater, it shares the coolant from inside the engine and radiator so if your engine isn't warming up it won't warm up either.
If the Temperature gauge is moving less than before, its your Thermostat. If the Engine Temperature is the same, then your heat control valve is not opening or a duct flap(called a door) is not moving under the dash.
Having a Bad thermostat will affect how controls on the engine work and when they work.
the problem might be the water pump but unlikely unless your engine temperture gage spikes, the problem might be your heatercore. it is a small radiator in your car to heat up the air, they become clogged but dribre in your antifreeze, you should try cleaning it out first before replaceing anything
The ECT is the "Engine Coolant Temperature". There should be 2 sensors on the engine, one for the ecm (engine computer) and another one for the temp gauge on the dash. I dont have the info to tell you where they are, but near the thermostat housing and the cyl head is the logical place.
sounds like the gauge and sensor r workin properly....but you do have to address that coolant leak...that causes your temp to fluctuate cuz you cooling capacity is being reduced
First of all, it doesn't sound like your thermostat is working correctly to keep good hot/warm air coming , so I would change that, or have it changed for better heating inside. If you lift the hood & look in front of your radiator, On the engine side, you'll see a fan attached to, or in front of the radiator. It won't come on until the coolant temperature gauge gets up to proper operating temperature. Without getting in to too much detail, have your thermostat changed, and my guess is everything else will start working as it should, and whoever does the work, should know enough to check the fan operation when they do the thermostat.
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