Does low antifreeze cause hot engine a/c off - Cars & Trucks

check oil level add if low.. check antifreeze level add if low..retest

Depending on what the temperature is depends on the amount of coolant you use with water. Check the instructions on the coolant/antifreeze.
With the right coolant mix you can then top up the expansion tank or direct to the radiator depending on your car.
If you have let the fluid go very low you may have air in the pipework so top up then squeeze the large pipes to move the air.
Try not to top up when the engine is hot, the system becomes pressurised and you could get burnt. Cold liquid in a hot engine can cause cracks.
In an emergency you can add water or neat antifreeze depending on what you have but get someone with a hydrometer to check when its next convenient as some antifreezes with cause corrosion on alloy engines

YEP LOW COOLANT WILL CAUSE ENGINE OVER HEAT.BE SURE TO HAVE CORRECT MIXTURE 50/50 COOLANT AND WATER.TOO MUCH WATER IN COOLANT SYSTEM WILL CAUSE IT TO EVAPORATE AWAY.NEED ANTIFREEZE TO RAISE BOILING POINT.

Sounds like it could be a thermostat not opening. If the thermostat doesn't open then it will get hot because its not allowing the cooled antifreeze from the radiator into the engine. Your car has two circulations with the antifreeze. While your car is running it is heating up the antifreeze in the engine and when it reaches a certain temperature the thermostat opens and takes the hot antifreeze from the engine and puts it into the radiator to be cooled. At the same time the cool antifreeze from the radiator is placed into the engine to keep it cool. If your thermostat doesn't open your engine will get hot and overheat.

a question to an answer: is your truck has any heat when you rev it 2000 rpm, or above?
have you check your coolant level? if level is low you have a small coolant leak, a water pump may be at fault, and causing air pockets in your heater core, check for leaks your self, dealer wont tell you if vehicle still under warranty.
good luck

Blown head gaskets cause this symptom.
Also, oil leakage on to the hot parts of your engine can cause this problem.

The smoke can be either antifreeze or oil that accumulated in a plenum or low spot that gets hot when you start your engine.

I would highly suspect the thermostat, cost is about $12 for the part and some anti freeze. Good luck

If your heater core was leaking you would have antifeeze coming thru your vents and putting a greasy film on your windshield. You would smell antifreeze the stongest if it was leaking onto a hot engine part. low antifreeze will cause bad heater performance, I would check by the thermostate housing, and the water pump for leaks

If you are seeing coolant on the top side of your engine, it sounds to me like it may be the intake manifold gasket. Does this have the 4.3L engine? If so, this is a common problem with these engines. If the leak is severe enough, the cooling system will not build up the pressure it needs and this will cause it to run hot. Hope this helps.

Sounds like your antifreeze level is low. When it flows you get hot air and when there's an air bubble due to lack of antifreeze all you'll get is air.