Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
I am sorry for the long wait
do you have a multi meter on hand ?
is this a manual heater ac controller or an automatic controller ?
can you be sure in the under hood fuse box the 40 amp fuse # ***** called blower is good and be sure in the rear fuse box fuse # ***** is also good ?
a test light ?
ok if those 2 fuses are good and it has a new blower motor and resistor then we have to be missing power or a ground causing this to not work
can you borrow a test light ?
we have seen everything from bad heater controllers to ignition switches and internal fuse boxes cause this problem and a few wire wiring issues
if you can barrow a test light we can nail this problem right down
get to the resistor and with the truck ON and the blower set to HIGH see if the red and the orange wire terminals in the resistor connector show 12 volts
we will find out what is wrong
can you unplug the blower motor connector and with the truck on and blower set to high does one wire terminal show 12 volts and the other a good ground in the connector you unplugged at the blower motor ?
if the orange and the red at the resistor show 12 volts and the connector is NOT melted or has and burnt terminals see if the black that does NOT go to the blower motor is a good ground at the resistor
if that ground is bad run a new ground to that black wire
if the ground is good with the 2 powers and a ground then the connector at the resistor is bad or the resistor is defective
you need to test and see if the black wire terminal in the connector at the resistor shows a good ground
not the black wire going to the blower motor but the other one to test at the resistor connector
how are you making out ?
the black shows 12 volts at the resistor ?
if the black shows 12 volts the black ground is bad and that black wire is bad to ground or the ground itself is bad
if you cut that black wire that shows 12 volts the black one that does NOT go to the blower motor and connect a good ground to the cut wire part that goes TO the resistor will it work ?
ok let me know
99 % of the time when the ground is showing 12 volts its because the wire is broken to ground or the ground connection is bad and usually just running a new ground to that wire into the resistor will correct this type of issue