My 2001 Aztec has a small drip from the head gasket. It's not noticeable all the time, but I do notice a drip on my garage once in a while. I do know that the coolant is a Dex-Cool and not a regular coolant. Don't mix the two.
The thermocouple which measured the car's coolant temperature failed and so the car overheated.
because it is using electricity
Yes, as long as you are using the correct coolant as recommended by the vehicle manufacture.
The remains of the old coolant can cause the new coolant to fail. Using the wrong type of coolant can also damage the engine.
it is possible to have a small leak on the head gasket ,enough to let the coolant still leak into the clyinders and will account for a gallon to go weekly,and still show no signs of white smoke in the exhaust,also might want to check around the radiator fill neck to make sure it does not show a sign of cracks,this can cause coolant to vaporize out of the radiator and you will never see it leaking.....
It is red. I would not take any chances of using the wrong coolant. Purchase the coolant at your local Toyota dealer and you will be 100% sure you are using the right stuff. You only need to replace the coolant every 3 years.
Sounds like engine coolant getting in crankcase, could be an intake gasket going bad.
By the way of using coolant oil......................
If you are using the OEM radiator and it has never been replaced then some of the core may have collapsed blocking flow. If there is a lot of brown in your coolant this may be a good indicator of this. I recommend flushing the coolant system before moving to more expensive alternatives.
You need a coolant when using grinding machines because if you don't have one the temperature rises on the machine. If the machine isn't cooled it can cause burns.
Check your coolant! Be sure it doesn't look like chocolate milk. If it does, that's where your oil is going. You did not specify which engine you have, but the earlier 3100 V6 engines (94-99) were notorious for cracked lower intake manifold gaskets. It usually resulted in coolant leaking out along the driver's side and down onto the transmission housing, but in severe cases the gaskets cracked internally allowing coolant and oil to mix.
You can test the engine coolant sensor by using an ohmmeter. Attach the positive and negative probes to the terminals of the coolant sensor.