My car is an 87 Iroc that originally came with A/C. The guy I got the car from pretty much removed all the pieces from the engine compartment but left the inside controls, harness & vacuum hoses and that big case behind the dash. I found one of those heater boxes for cars that didn't come with air to use, and hooked everything up. I also swapped out the resistor pack for the blower motor so I could have 4 speeds instead of 3 that the non a/c cars had.

Now the problem. The circuit works fine if the switch on the control panel is either in the off or on the heat side, but if you slide it past the A/C section the fuse instantly pops. What could cause it to do that? I know its a dead short to ground but its just strange that only when the lever goes past the A/C part is their the problem. So since the car doesn't have A/C anymore is there a way I can kill the power to that section of the control panel? or what do you recommend? Any advise here would be great.

Thanks

 

When you turn on the A/C it tells the fan relay to give full power to the fan. It sounds like the wire to the relay is open to ground somewhere.

 

heres a diagram i found..

 

Look at the diagram MD supplied. If you are in the HEAT position and the blower runs OK disregard everything on the LEFT side of the drawing. In AC mode 12 volts is supplied through the switch to the comp and the associated components. You can simply cut the light green wire from the switch, and that will remove all of that wiring on the RIGHT side of the drawing. The drawing is in error as shown. On the RIGHT side it shows 12 volts to all connections on the switch in anything but the OFF position. On that side of the drawing the only switch connections that get 12 volts are the MAX and normal Bilevel AC connections. By removing the lt/grn wire you will completely open the AC side. Leave room for an inline splice if you want to restore it at some point. Let us know how you make out.

 

Hey thanks so much, that was exactly what I needed to know. I will try that this weekend and let you guys know how it turns out. Again thanks to everybody for the help.