please help: why my car is no heating air come out?

It is too cold in my car, even I turn the switch all the way to the heat, come out only the cold air, no heat come! what's happen? Thanks

所有跟帖： 

• Was the engine fully warmed up? -xxhhwxc- ♂ (62 bytes) () 10/30/2006 postreply 16:40:53

• Yes, no matter how long drive, it blowes only cold air -marie628- ♀ (0 bytes) () 10/30/2006 postreply 18:00:21

• you may have clogged heater core or -xxhhwxc- ♂ (35 bytes) () 10/30/2006 postreply 19:37:18

• check the heater fuse first, if its good, check the heater -austman- ♂ (0 bytes) () 10/30/2006 postreply 16:50:18

• the heater hose -austman- ♂ (0 bytes) () 10/30/2006 postreply 17:16:53