IM BLOWING ANTIFREEZE, KNOW WHY?

Sounds like I would check the water pump and look at the thermostat housing. Look for leaks or trails. Check your hoses and hose clamps. The water pump has weep hole(s) out towards the far most point of shaft behind the pulley. They will weep and even poor out of them holes when the pump is failing. Not a difficult job to replace the pump. The thermostat housings can leak too, and have been known to crack from over tightening bolts.
Hope this helps a bit, more info will help us help you. Miles on the car, last time these items have been touched or replaced, what year and engine your car is,...etc. Any thing you can tell us.