Coolant, usually referred to as "antifreeze," protects the engine as pure water cannot. Added to water, the coolant raises the boiling point, lowers the freezing point, protects against corrosion and lubricates the water pump. In a pinch, you can run the engine on water but you will get the best service from your engine if you keep a good charge of coolant in the cooling system.
Yes it is.
this sweet smell sounds like you have an antifreeze leak in your heating/cooling system. most of the time it is the heater core
=To properly flush the antifreeze on a 2002 Yukon you will need a antifreeze vacume system you will need to start the car and have it running turn on all the heating modules to high and have the car reved at about 1.5 r.p.m, or a little higher to activate the vaccume this will start sucking the old antifreeze out. When the radiator is empty{you will know when it is empty because there will be no more antifreeze coming out}you can then fill it up with half and half antifreeze[half water half antifreeze].=
the water in your radiator is rusty because your antifreeze/water ratio is not correct. Antifreeze serves two important functions: protecting the cooling system at temperature extremes and inhibiting rust and corrosion in the system. When your antifreeze/water ratio is not correct Rust and sediment can accumulate in the cooling system. This can eventually clog your cooling system mainly your radiator and cause your car to overheat, and more serious problems with the over heating. I would suggest flushing your system and adding the correct antifreeze/water ratio mixture. Doing this your self or having it done by proffessional.
Water boils hotter and faster then antifreeze, more water means engine damage.
Intake or inlet manifold has nothing to do with the heating of the car. Newaz.
Service the cooling system. Drain the coolant and replace the thermostat which is more than likely stuck open. Pour in a 50/50 mix of antifreeze and distilled water. Bleed all air from the system.
HVAC in a car is the Heating, Ventilation and Air Conditioning system.
Putting 100% "straight" antifreeze in your car's radiator will expose the cooling system to freezing at a much higher temperature than would the appropriate and recommended mix of roughly 50/50 antifreeze and water. Antifreeze works best WITH water.
If you have water instead of antifreeze in your cooling system, it will freeze! You won't be able to start the car, because the engine is connected to the water pump (which won't be able to move). If you have nothing in your cooling system (no water, no antifreeze, nothing else), then you need your head checked. Your car won't start either.
Typically that leak is caused by a leak in the heating system. The heater core is under the dashboard, just above the passenger side.
It will overheat because the water is needed to circulate/transfer the heat.