Heater core is leaking and needs replacement
If it gets cold enough the coolant will freeze and crack the block if there is no antifreeze.
Overheating is due to, well, the coolant in the cooling system getting too hot. In a normally operating engine, this should never be a problem. First, check that the coolant level is correct. If it is correct, I would suspect a problem with the thermostat. When the engine is cold, the thermostat closes off coolant flow through the engine until the coolant reaches a pre-determined temperature. When that temperature is reached, the thermostat opens to allow the coolant to circulate at that exact temperature. Thermostats are known for failing and either not opening or not opening enough at that pre-determined temperature. This causes coolant to get trapped too long in the engine coolant chambers, heating it beyond limits, causing the engine temperature to increase and possibly overheat. If my Maxima was overheating, I would check the coolant levels and then possibly replace the thermostat. It usually is no more complicated than that.
Thermostat may not be opening
No, if anything it would get cooler from having too much. -You have a different problem, possibly a coolant leak.
Trouble code P0116 means:Engine coolant temperature circuit range/performance problem
Intake manifold gasket
Need to check the intake manifold, It is a common problem on the voretec engines.
Well, the common cause for the light coming on is the radiator is low of coolant. But I assume you have checked the coolant level and it is ok. That being the case more than likely the coolant level sensor is defective and needs replacing. Can also be the problem is in the wiring.
Build up in the radiator system or a plug can cause this. Do a radiator flush (or have a professional do it if you're not interested but it's fairly easy if you read an online HOWTO) to remove the grime and refill with fresh coolant. This solved the problem in my 2003. Check the low coolant level sensor and replace if defective. It is in the side of the radiator.
I am not a car guy, but my low coolant light just came on in my Saturn Vue. I checked the owners manual and it said I should add anti-freeze/coolant. If you go to a car parts store (NAPA, Auto Zone, Pep Boys), they can tell you what type of coolant to add. If the problem repeats, you probabaly have a leak in your cooling system. Good Luck!
code 15 is coolant temperature circuit {low temperature} Im also trying to source exactly what this problem equates too as im currently trying to help a friend with the same code problem on his 1994 astro awd !
You should not need to bleed coolant. Ever. If the coolant is filling up on its own the stuff in there is not coolant and you have a big problem.
check coolant sensor float most common problem.
Bubbling coolant usually indicates a head gasket problem...
cracked head
If only adding coolant to a leaking system it is safe because soon you will be forced to drain the coolant and fix a problem
Could be a head gasket problem. Might want to try a compression check to see what that tells ya.