Push the button that says "2 High".
Yes, it could.
it's in the high pressure side of the ac line
its a relay in the dash or check ur switch
possibly you have a leaking cooling line from your trans cooler or radiator
t.p.s throttle position sensor
Sounds like your Blower motor resister, it controls the voltage to your blower motor, controlling the speeds, if you always have it on high, med ect. that speed is more likly to burn out first
Drain the blazer radiator. Refill with water. Open the heat on high, start the engine for a few minutes. Drain the system again Repeat this several times to get all of the old coolant out.
possibly a high speed blower relay. If the the ac works on all speeds but high, this is my bet. You should be able to pick up a replacement relay at most parts stores.
There'll be an indicator light on the dash which comes on when the high beam circuit is energized.
YOU WILL DIE! have you check your IAC ??
Yes you can, but don't drive over 50 to 55 MPH