95 caddy sts. 3.7 v8 northstar all coolant poured out from front passenger side of car near the battery and rad somewhere after trying out the acceleration..

You have some protection for the aluminum components with new coolant but for all engines with aluminum pieces,the tablets are cheap insurance and recommended to prevent/reduce electrolysis which results in leaks.
Use them.

i would have to say ck. the easast things first,when was the last cooling system flush making sure all cooling system parts are clean and new coolant added(old coolant looses its abilaty to work properly when old)then have the thermostat ck to make sure it opens and closes at the proper temp.

this could be a few different things it could be something with your electronic choke or it could be a vacuum problem most likely a vacum problem

Generally speaking, if you have engine oil in the cooling system, you have a leak somewhere in the engine, which could be a head gasket.
Is there any sign of coolant in the engine oil ?

coolant bleeder valve is on r/s passenger side on top of rad is a phillips plug to eliminate air bubbles and make filling easy i remove upper raqd hose at rad lift hose pour coolant into hose till full and coolant starts to come out of rad then attatch hose to rad finish filling fluid till full you will fill system full and no air bubbles just a trick i use tell no one else lol

If Equipt, The Fuel Filter Will Be Located On The Passenger Side Rear Of The Vehicle Above The Right Rear Suspension Bracket. It Will Be In Front Of The Wheel Above A Large Plate.

First of all you need to check your coolant return bottle level, it's probably low, and needs coolant added. Heater will be starved for coolant, if level is low, thus, cool/cold air comes out. Try to add when engine is cool, to avoid getting sprayed with hot coolant. Leave cap off for a while, turn your heater on (not defrost) and let engine run up to temperature, and add more as needed while you watch level. Rev engine slightly and hold it for 5 seconds or so, every once in a while to help circulate coolant, and remove any air in system. If you have an actual rad cap, that you can remove and watch flow in radiator, that's even better, for adding and bleeding air out same way. Make sure your rad fan is working as well, and once you get it topped up, and heat back working, I'd seriously consider having a system pressure test done, as you obviously have a leak somewhere if the level went down to the point of overheating, and heater was starved for coolant. Keep an eye on that return bottle level until such time you have it checked, to avoid more damage to engine.

I had the same problem with my STS. Go back through your programing menu and "check" remote start again. Somehow, mine defaulted to not allowing remote start feature. It was good to go as soon as I re-programmed it.

The thermostat opens at 196F, but sitting idling, the coolant fans may not turn on til' 125F.

neither the 93 seville is just that it's the 4.9 liter before the northstar sts 4.6 came out in same year