The 1969 Camaro we purchased over 4 years ago, is nice looking and runs well, but was butchered by the ******** that put in the crate engine for the previous owner.

The car was AC, but that was taken out (compressor, lines, etc.)

The heater fan has not worked since we got it. Finally getting some time around to check it out I found the AC Relay (on top of the Condensor (?) shroud in the engine compartment) was gone. Replaced it, but that didn't help.

What powers the heater fan?

There is power through a wire from the horn relay (fused) that goes into the AC relay. A purple wire runs from the AC relay to the heater fan. When I jumped the two (orange fused wire from horn relay to the purple wire) the fan ran fine.

However, there is also supposed to be power through the fan switch. A number of wires come out through the firewall and into the "step-down" resistor (also on top of the shroud). The purple wire also is attached here.

I get no power out of any of the wires coming from the fan switch at these connectors, no matter where speed set at. There is power at the fuse box, on both sides, so there is power to the fan switch (if it reaches there).

Am I right that I should get some power through those wires from the fan switch to operate the fan?

Do fan switches go bad very often or is my culprit probably somewhere else?

Thanks much,

Thomas