In article . com>,
"Joachim Peiper" > wrote:

> I have a 1990 mustang and the blower will not blow when set on high but
> blows on all other speeds. Is this a problem with the blower or the
> switch?

Either the blower switch is defective or its ground path is open circuit.
The ground connection to the blower switch is strictly for high speed. The
other speeds use the switch and a combination of series resistors with
another path to ground...

Mike
93 Cobra