hi, i have a heater problem with my 90'rs ever sence i had it "about a year" it's been blowing heater fuses regularly and i didn't know why so i pushed a piece of metal in a blown fuse and stuck it in the plug "not smart i kno" and forgot about it everything worked perfect till about a month ago when i splashed through a big puddle the heater died all the lights flashed and i smelt this electrical burnt smell, now when i turn on the fan it will go for a little while stop and if i turn up the speed it will pull down the volt metre at the first setting and short the car out and stop it at the 2nd position!, any ideason whats doing this the switch maybe? thanks in advance!

 

Test the blower motor.

Do this by isolating the power input, then applying 12 volts directly to it thru a fuse.

If the motor can operate for a half hour or so without blowing the fuse or overheating it means the problem is in the wiring to it.