Over heating amd loosing antifreeze

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These details will help.
Thanks.

intermittent overheating is cause by a sticking thermostat 99 percent of the time. The other reason can be a loose hose clamp which is mostly unlikely for it should of been doing this for a long time if the hoses were never been removed

overheating is most likely a bad thermostat, but the coolant loss is a second big concern. Does the exhaust look like steam? You could have a cracked block and the coolant is leaking into the engine. Also check the oil for contamination.

Check the sensor which controls the cooling fans that cools the radiator it prevents the engine from over heating and allows the temp gauge to stay at normal range.recently had problems with my 2003 impala overheating it was the sensor had the thermostat replace as well.

you have air in the system, look for the highest point of the system you could try to bleed the air out as the motor warms-up

My mechanic has had my Silhouette for two weeks for the same problem. Engine Tempurature is running at 195 degrees when the gauge is pegged on overheat. Normal operating temp for this van is 220. So it is not overheating. Had the cooling/heating system flushed and refilled, bled and topped off. Still the gauge is up and down like a yoyo. Still looking for answers.

It is IMPORTANT That you Correct This ,as Engine Temp is Important. I Recomend the Coolant Temperture Sensor Be Replaced to Correct this.

Your radiator is getting clogged up with mud causing the lack of air flow through the radiator. You may want to install a mud deflector in front of your radiator to keep the mud from clogging up the radiator and may be run your antifreeze ratio 40/60 (antifreeze/water) the higher the water content the better the heat transfer, but your have to keep an eye on the level of the coolant level more often. Water will evaporate quicker but too muck antifreeze will have poor heat transfer and 100% antifreeze will gel when heated causing poor circulation causing overheating. Good luck and hope this helps.