Um 1 way to put it DONT
No, the oil level can affect the the oil pressure if it is too high or low. The coolant level has no connection with the engine oil pressure.
No, it wouldn't affect the idle unless you were somehow overheating the engine.
engine speed, engine load, coolant temp, throttle posision and intake manifold pressure
Engine coolant.
If you try and run an auto engine with just water, instead of antifreeze/coolant; your car's engine will not last more than a few minutes, before it overheats or freezes up, depending on the weather conditions and how hard you run the engine. Coolant is not an optional choice instead of water, it's mandatory if you want to keep the engine running in good condition and save your car and a lot of money. Get one of those hoses with meters and red pointer, at Wal-Mart and check and see how well your cars antifreeze/coolant is holding up. It only costs around five dollars.
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Coolant is used to keep an engine in a vehicle at a temperature safe for operation. If no coolant is in the reservoir, an engine will not start.
The engine coolant temperature sensor is usually on the front of the engine. The coolant temperature sensor will be in the vicinity of the thermostat housing.
Check the freeze plugs. large round plugs on either side of the block. Those are there for if your coolant freezes, they will go instead of cracking the block.
Coolant, also known as antifreeze, serves two purposes in a cars engine. (1) Coolant keeps the engine cool. During the summer especially, your engine can get very hot. We all know that when water gets hot enough, it boils. Have you ever seen a car on the side of the road, with a bunch of steam blowing out of the hood? That is a car with an over heated engine. Coolant can still boil like water, however coolant has a higher boiling point than water. (2) Coolant also keeps the engine from freezing. This is very important. If your cars engine has water in it, instead of coolant, and the outside temperature drops below freezing, your engine may become susceptible to becoming frozen. If your engine freezes from sitting in the cold without coolant, the water inside of the engine will expand. When ice expands it has to go somewhere. You engine will crack and will not be repairable. Coolant can still freeze, but unless your using the lowest grade coolant, and your driving through Alaska, your coolant probably won't freeze. How does coolant both keep the engine cool when running, but keep it from freezing too? Its simple; Coolant has a higher boiling point than water (99.7'), and it has a lower boiling point than water (32'). The temperature highs and lows vary with the type of coolant you use. !CAUTION! When your coolant level goes down, due to evaporation or leaks, you may out water in your radiator for a temporary fix. HOWEVER this alters the highest and lowest points of your coolants temperature peak. MORE WATER = WATERY COOLANT
Yes, you can. Depending on how much you put in, it will change the boiling point of the coolant. If it's just a little bit, you shouldn't affect it that much. If it's a lot, you have to watch the temperature more often. For best results, you need a 50/50 mixture of coolant & water.