My equinox ran hot now want start

If it's blowing fuses, you probably have damaged wiring to the horn, not a bad relay (relays generally fail open rather than with a short to ground). Find the horns (GM usually uses two horns to play a chord), and inspect the wiring to them. Look for a bent terminal shorting to ground, or some spot on the wire where the insulation has been cut or worn by contact with metal. In particular, if the car has been in an accident, check the areas where there was body damage (if the horn relay was bent up by an accident, that may be an exception to the general case that relays themselves don't usually blow fuses.

does alarm have a backup battery maybe it is flat

most likely it the green wire black almost always ground

Check the fuses.

check for blowed fuse or bad relay, you can hook test light to see if horn getting power when you press horn pad if fuse and relay okay,remove horn and hot wire it if it blows, more likely horn pad with airbag in steering wheel bad,if horn pad bad you have to replace whole airbag with with horn pad as a unit.if horn dont blow when hot wired then horn it self is bad.

This is your security system. Your van thought it was being stolen. Next time do not leave your keys in the van and lock the doors.

LOOK ON THE RIGHT FRONT CORNER OF THE ENGINE COMPARTMENT FOR CAR HORN.TO CHECK CAR HORN HOT WIRE CAR HORN USING JUMPER WIRES TO BATTERY.IF HORN WORK LOOK FOR BLOWED FUSE.IF HORN DONT WORK WHEN HOTWIRED REPLACE HORN.

try yelling out the window!
Or check the fuse, if it's good try hot wireing the horn by running a hot lead from the battery to the positive terminal of the horn. If that doesnt work its in the steering wheel.

If the blower is blowing air just fine, but you cannot control the temperature, you need to listen to air coming from the vents while turning the temperature from hot to cold. If you do n ot hear any change in airflow, then you may a temperature door in the dash broken. this is becoming a common problem on the Equinox and Pontiac Torrent,

Tech JK
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You may just have to wait it out until the shorted out areas dry out, or disconnect the battery cables, replace the fuse, reconnect the cables and see what happens. HOWEVER: If you do, you will also reset everything else electrical. . .