First of all I drive a 03 Blazer 4wd 4.3 with about 82k on it.

This first problem which im more concerned about is a coolant leak. It looks like its coming from the area just above the starter (when looking at it from underneath). Its only noticeable if i don't drive it for about 24 hours. I did read a TSB about the oil cooler line, could this be a possible cause?

The second one is a high pitch whine sounding like coming from the driver's side of the engine when i accelerate, it stops after a few seconds or when i let off gas.

The third problem is my number 1 and number 2 settings on my HVAC controls dont work, bt the 3 or 4 do.

any help on these problems. will be much appreciated. not so much worried bout 2 and 3 more concerned at the coolant leak.

 

1 may be lower intake gasket blown out
2 and 3 may be a vacuum leak, hoses get weak and old check to see if your 4 wheel drive servo comes out of 4 high all the way, this is a sign of a vacuum leak also since the servo and climate control mixing box are vacuum control. But I think you meant that your 1 and 2 blower speeds do not work, This may be the resistor card that is normally located with the blower motor but not sure complety

 

For the whining, mine did that a little when i was low on power steering fluid. Fill it up and see if it still makes that noise.

 

mine had whining sound too and then i changed the belt and it solved the problem