Blower Relay Switch Driving Me Nuts!!!

[Inze]

The blower relay switch keeps blowing the wire harness is melting because it has blown 3 times. When it blows it's just the high posistion that dosen't work. The last time it blew I was driving down the road @ 70 mph with the ac on and the blower started to slow and then it just blew!
Heres what I have done so far.

Replaced the,
blower motor and resistors, neither smelled or did not work these were just suggestions, that they may be affecting the current/draw/amperage and blowing the relay.

Someone said it could be a bad ground but where the heck is the ground located?? Could it be that I have already fixed the problem and the wire harness is giving me problems cause it's melted and singed/black(I tried scraping it with small flat head driver)? If so, how/where do I get a new wire harness from and if I do how would I install it with wire butt connectors inline?
Please help

[Mikado14]

What year, please (my crystal ball is on the fritz)

[Inze]

Originally Posted by Mikado14

What year, please (my crystal ball is on the fritz)

1996

[rwgreen]

Hello Inze,
I have almost the same problem with the same year S-10 (1996). I have a question for you.... where exactly is the relay for the heater? I think I remember it being one of the 3 on the firewall??? Also where is the resistor pack located?

I too was told it could be a bad ground somewhere but that leaves me scratching my head as it seems it could be anywhere.

My problem now is that I am getting no heat or air. Blower motor not kicking on. It worked fine for a long time, then the air went to the default defrost/floor vents for awhile, then stopped working altogether.

Hope you get yours fixed! I know how frustrating it is especially when it is freezing outside!

RWGreen

[Cam1959]

Originally Posted by Inze

The blower relay switch keeps blowing the wire harness is melting because it has blown 3 times. When it blows it's just the high posistion that dosen't work. The last time it blew I was driving down the road @ 70 mph with the ac on and the blower started to slow and then it just blew!
Heres what I have done so far.

Replaced the,
blower motor and resistors, neither smelled or did not work these were just suggestions, that they may be affecting the current/draw/amperage and blowing the relay.

Someone said it could be a bad ground but where the heck is the ground located?? Could it be that I have already fixed the problem and the wire harness is giving me problems cause it's melted and singed/black(I tried scraping it with small flat head driver)? If so, how/where do I get a new wire harness from and if I do how would I install it with wire butt connectors inline?
Please help

i don't beleive a bad ground would overheat the harness wires. that would be a live wire shorting out to a ground source i think. the ground wire is from fan motor mount screw to say fender screw since fan housing fiberglass and motor needs good not poor intermitent ground. harness sounds bad. either egt one from parts supplier or wrecker or for now cut 1 wire at a time to remember where they go and connect them reliably to housing plugs meant for harness ? ;-)