97burban

Hey I got a couple of questions.
First off,I have a 97 Suburban with 140,000 miles on it.I just bought it a couple of days ago.It is going to be used mainly as a toy hauler.
Ok,my first question is Barn doors on back.My drivers side barn door the top of the doorgets stuck.You have to push on the door a bit to get it to open,does that mean that I should replce the upper latch or is there something else I should be looking for?
Next off,it has no a/c,the woman I bought it from says tha the fan only blows on high,its not cold though.I think I found the leak,just wondering about the only blowing on high,how to fix it?
It also has a powersteering leak,its not much though and it looks like it is coming from the hard line hose on the bottom of the pump.Need to check that out a little more though.It has power steering fluid everywhere in the general area,but the power steering is still working.
Next and final question,I am wanting to lower it a bit to make it look a little tougher,is there a a ggod kit out there to do this,any suggestions.
As far as the motor it has a 5.7 vortec
2wd
4 door
Thanks for any advice or help fixing my problems