Ok, about a month ago my A/C wouldn't blow on the high setting. Thanks to someones advise I tracked it down to a melted fusable link. I ended up just taping it up for the time being (I know, my own dumbsh!t fault for being lazy, never again! ) Well it melted the electrical tape and about a week later I turn on the car, drive down the road and the A/C stops blowing, and smoke comes from the switch in the dash. I pulled the switch unit thing out and there's a flat orange peice that is obviously fried. My question is this, once I replace that switch, wtf am I looking at also replacing since I don't want to fry anything else and I want my a/c to blow on high?

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'86 WS6 Trans Am

 

When the fan switch is in the "high" position, the fan switch powers the blower high speed relay, which is near the blower motor, under the hood. The relay gets its power from a fusible link that is connected to the large lug on the starter. Sounds like the blower motor may be defective & drawing too much current. Check the relay too. Measure the voltage drop across the relay contacts (the wire going to the fusible link & the wire going to the fan motor) with the blower motor running on high - the voltage drop across the relay contacts should be no greater than 0.2 volts, or so. If it is higher, replace the relay, too.

When the fan switch is in the low, med low, or med high positions, power from that same fusible link goes through the ign switch, the 25 amp HTR A/C fuse, the fan switch and the blower resistors to the fan motor.

Also, make sure the ground wire connection for the fan motor is OK.

Tim

 

Ok, so if I'm reading this right, if that fusable link blows my fan goes out entirely?

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'86 WS6 Trans Am

 

Yes, not only would the blower power go out, but the ign switch power would be out, too, if that fusible link opened up.

Tim

 

Ok, then what fusable link did I blow up before then? Because when I bought the car, a fusable link was fried that only prevented the fan from coming on at high.

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'86 WS6 Trans Am

 

Apparently, it's not the fusible link (unless someone changed the wiring). Check the blower high speed relay.

Tim

 

Sorry for opening an 8 year old thread but i am having a similair problem my blower motor is not working neither is my radiator fan so i there a fusable link that is both those i just installed headers and i think they overheated the starter wiring but the ignition still works