Its normal for the expansion tank to be only half full. As the car warms it uses this air space for the coolant to expand into. If the expansion bottle is full the coolant will be pushed out of the overflow. When the car cools overnight the cap will allow air back into the tank. Dave Sontos -----Original Message----- From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of tuxr Sent: Tuesday, December 13, 2005 7:45 PM To: dmcnews@xxxxxxxxxxxxxxx Subject: [DML] Coolant Coming Out Update: I've been putting in coolant for the last several mornings. When I stop the car some of the coolant comes out of the hose that connects to where the coolant cap is. Not alot, but some. I'm assuming it's coming out when I'm driving, but I don't know that. Other than the fact I keep putting more in. Any ideas what would cause that? Thanks very much for the advice. To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/