Quote:
Originally Posted by NHRA
im thinking there may be a high speed fuse? somewhere anyone know for sure..........cheers
|
check all fuses with a voltmeter power on.
since you have the lower speeds the only component that is changed when you go to max blower would be the high speed relay.
first find the high speed relay . then with the switch set to max blower speed see if you get voltage and ground at the relay coil #85/86 pins.
if so then check for voltage at #87/30 . if the voltage is not on both these pins of the relay then the wire or fuse /circuit is open that supplies power to the relay switching contacts.
as mentioned it is possible the switch at the max blower speed position is bad. I doubt it.
If the fuse is blown this may mean the blower motor is in need of replacement. remove blower and see if it rotates freely . bushings not worn or debris interfering with rotation. also wires shorted . fuse should be over 20 amps. I think !