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i have a 95 with 3100 v6 178000 on it when using the heater it loses antifreeze but dont know where no puddles when parked (hot or cold) i need to put a quart or so in with each fillup put in a heater core about 2 years ago no smell in the interior it also loses some antifreeze in summer but maybe a quart a month any suggestions

Could be the intake gaskets, they are prone to leaking. Check both ends of the heads. You may be able to see a leak where the lower intake and the heads come together. It's hard to see the back head so you may have to use a mirror.

Other check is just to pull the oil cap off... is there a mayonnaise type material stuck to it? And what color is your oil when you change it?

i am not getting any antifreeze in the oil oil looks normal i just lose it faster when i use the heat lose some over the summer but not as much

well using the heat doesn't change the path of the coolant so I don't see how that can make any difference. Coolant is always flowing through the heater core its just a matter of where the deflector sends the fresh air before coming in the car.

The only other common leaking areas on these cars are the timing cover gaskets, water pump, and a cracked radiator... It may not leak when you stop which is odd because typically then its under its most pressure. But it could be leaking off the timing cover and evaporating before hitting the ground.

Check your trand fluid just for giggles. I heard of the rad cracking internally and leaking coolant into the tranny cooler.
Just a thought.

If you still cant find a leak, then your burning it.