I have 1988 iroc camaro 350 and about every two days the coolant is gone from radiator. coolant is still in the bottle and that never changes. I did a pressure test of coolant system and at first I found a leak in a hose for coolant to throttle body. I fixed that but it still is using coolant but never pulls from the bottle. there is no smoke coming from exhaust and there's no coolant in oil. any ideas?

 

coolant theives?

 

Did you change the cap?

 

Heater core?

 

water pumps gone bad

 

headgasket :P

 

Not likely to be any of those if it holds a pressure test.

 

caps been change as well

 

You need to do a cylinder leak down test for each cylinder. While doing so, check for bubbles in your radiator...
Wait is this an auto? Perhaps trans/coolant jackets are crossing....? I doubt it, but still the chance.

 

mushroom cap looken thing next to the TB.

 

Can we get a little bit more on diagnostics? Is there coolant residue anywhere in the engine bay, like near the radiator cap?

Does the car actually leak, or at least leave puddles of coolant once you park it?

 

May be losing it through your exhaust. Just happened to me few months back with my Malibu.

 

Instead of guessing around with heads in ***, try this.
Listen for air leaking from tailpipe, from radiator (bubbles), intake, etc.

 

my old car i use to have blew a head gasket and it sucked the coolant in the heads and evaporated through my exhaust. lol ran for like a year with a blown head gasket till it died on the way to the scrap yard.

 

Lucky you. Mine lasted 2 weeks started dyin on my way back home from Six Flags with me kids.