97 Bravada Overflow Problem

Hey Last week my temp Gauge Spike and went redline and then shot back down to 1/4 of the temp gauge i was 2mins away from the house so i went home and popped the hood and there was no coolant left in there. So i go out and buy 50/50 mix and put it in drive it around the neighborhood and all was good. Well i get home today from bein out and just randomly decided to check under the hood and teh Overflow Tank is empty again. I followd the overflow hose coming from the top of the tank and its not connected to anything. Is this a problem and is the tank suppose to be empty. Also when the Heat runs it has a smell of Oil. Any kind of help would be great Thanks

The coolant tank top vent hose just vents to the open air, no problem.
The smell from the heater, does it smell like the antifreeze? Is the passenger side front floorboard wet?
Sounds like you've got a big leak.

not a horrible leak but its still leaking.
ive got the shroud off and air filter too try and see where its leakin but i cant tell too much stuff in the way

And when the heat is on it smells like coolant

floorboard is wet but soda got spilled so cant rekly on that

ok i got my hand behind the fan and water pump and its leakin off the water pump so whats a quote for time on takin out all the stuff to get to the pump and the things i need to take out. Also if it is cost effienct to have a mech/tech do it ill take quotes on that to. 61109 zip if your in town and want to help i got all week off

Here's some info.

http://www.automotiveforums.com/vbulletin/showthread.php?t=641796&highlight=water+pump

The listed time is 2 hours. (0.9 for warranty). Working steady and thoroughly it shouldn't take any longer than 1 1/2 hours. (I can do one in 45 minutes)

There is a walkthrough with pictures here:
http://www.automotiveforums.com/vbulletin/showthread.php?t=498467

damn yo you can do a waterpump in 45min it took me 8 hours to get everything apart and then another 5 hours to put it all back together. granted i was doin it in 30 degree weather so i was takin alot of warming up breaks. But the tutorial gave me alot of help thanks for that. and my baby is workin a hell of alot better. Props to these fourms i will definately return if the Bravada decides to pull anything else on me