No Heat When sitting still

When I first started my 2003 liberty this year when it was cold outside i let it run to warm up. Only problem was when I got in it no heat. But when I proceded to drive I started getting heat. Also when I first take off I hear what sounds like water behind the dash. What could be causing my heating problem along with the water noise?

Sounds like your low on coolant.

Checked coolant its good could it be the heater core?

I usually disconnect both hoses I put a water hose in one end and flush until it runs clear. If partially plugged its noticeable. Some heaters are vacuum controlled and a plugged vacuum hose or heater control will cause problems.
I use a vacuum gage and start close to the heater and go to I find the problem.
If climate controlled go to http://www.alldata.com/ and purchase a years manual for your truck appx. $29.95 discount on other vehicles.

It could be, Wouldn't hurt to try and back flush it. What does your coolant look like, nice and clean or nasty dirty?

I used to have a Jeep grand Cherokee that made that same "water gurgling" noise when the coolant got low.