antifreeze on passenger side floor.please help

hello,

i noticed that i have antifreeze on my passenger side floor.what could be causing that?and is it expensive?
thanks

Sounds like the heater core or hose connections are bad. Heater cores are inexpensive, but the replacement of the unit could be a challenge. Check autozone for repair guides to see if you're up to the repair and the difficulties involved with the replacement.

how would i check the hoses?where is the heater core located?is there a way to check heater core?

I would need more information to make a suggestion. Year, Make, Model, AC? Engine.
OR
You could go to www.autozone.com (http://www.autozone.com) look up your vehicle, look up heater core, look at repair guide for this application and make an assessment for yourself. I would recommend this to fimilarize yourself in detail what this repair will entail.

1988 gmc s-15 jimmy 2 door. 4.3l auto trans and yes there is ac

Drain the cooling system from radiator OR clamp off the hoses running from engine to heater core at the fire wall passenger side. Disconnect the heater hose clamps and remove hoses.
Inside vehicle, passenger side under glove box, remove the heater core housing screws. You may need to un-screw and move to the side the courtesy light asm. Remove the housing cover. Remove the 2 heater core retainging brackets and remove core.
You may have to remove the glove box door to get to the upper housing screws.
http://repairguide.autozone.com/znetrgs/repair_guide_content/en_us/images/0900c152/80/03/da/5a//small/0900c1528003da5a.jpg