I,need to no were the horn is located on an 1991 ford tempo gl

in the front by radiator

It sounds to me like you need to replace your blower motor

behind back axle-- under car of course.

Overheating at idle is usually due to the engine cooling fan not working. Could be a bad fan relay (most common cause), bad fan thermostat, or a bad fan motor.
Replacing the power window motor is quite difficult, I would leave this to the pros unless you are really mechanically inclined. I replaced one on an Aerostar, but I don't think I'd try it again.

just follow top hose back to engine then go at it slowly you will do fine

Open the trunk and look at the back of the spare tire cover and see if the codes are there

there is one and it is located under the passenger side toward the back by the gas tank.

there are 2 screws that adjust up/down & sideways. park 20 ft from garage door.Left - in a little & down a little. right - sown a little.

You may find that you have a horn fuse if you do simply remove it other wise here it is.
The horn in my 1994 ford tempo is located behind the right front tire wheel well. (1) Remove the right front tire. (2)Remove the inside thick black cardboard protector(A lot of work)(3)Look up inside the fender. You will see 2 small horns.One marked high(h) and one marked low(l).
hope this helps....Good luck!

It is located on the left side under the hood it is follow the line from your power steering pump and you will see it