Subject:	cooling system
Question:	You talked about letting in to much outside air, well my car has a flapper that is either outside or recirc. I will try the flushing of just the heater core. How about letting some chemical such as vinegar sit in just the heater core over night? Thanks, again.
Answer:	Landon, You can use a cup or so of distilled vinegar to clean out any deposit build up in your heater core. I have even heard of others using rubbing alcohol and even gasoline to clean it out. Gasoline it the most powerful cleaner but its EXTREMELY dangerous. I wouldn't recommend it for this job. The vinegar or rubbing alcohol should do the trick. Be sure to flush out the core with water very thoroughly. Good luck!