Military66

[Hello...question!! I have a 78 anniversary series. The heater blower motor switch stop working. I checked the motor itself, It works fine. Fuse still good. console switch (low,med high) i believe is good. It appears there is NO power at the fuse area. I took what i believe to be the Heater/Ac relay under the hood @ the firewall. took it apart and No wires appeared to be broken or loose. What's next??

MelWff

you checked the fuse box with a voltmeter? there is also a resistor in the circuit but that effects the lowers speeds only.

Military66

No Sir!!...I did a quick check with a regular test light. i noticed every other fuse had power except the one where the heater fuse was. I thinking the actual heater/Ac relay box shouldn't cost too much, I'll change it and see what happens. Thank you sir!!

0Willcox Corvette

Simplified Schematic..



Willcox Corvette Testing a 1977-1982 Corvette Heater and AC Blower Switch

corvettesummer79

I know I need to do more testing but does anyone understand this diagram enough to know why I would have power to high speed even with key off? already purchased a new relay from Willcox and installed it. Could it be a bad resistor?

corvettesummer79

[QUOTE=corvettesummer79;1589360433]I know I need to do more testing but does anyone understand this diagram enough to know why I would have power to high speed even with key off? already purchased a new relay from Willcox and installed it. Could it be a bad resistor?[/QUOTE

thanks 77vetteluva and sixfooter understand it better now