no heat?

okay..so heres the deal...i have a/c (don't work) and i can only get heat with it on hte bi/level settin under a/c...if i but it on the heat setting its only luke warm if that...so is this a vacume leak...or a clog somewhere?

thanks

I had simular problem. I unhooked the heater core lines in the fire wall, then ran water backwards through the heater core until it ran clear. It was like chocolate milk when I started. I have pretty good heat now. Hope this helps.

thanks...i checked the lines and its hot as hell going into the core...and cold comming out so its all blocked up...i just need some time to "flush it"