2003 tahoe 5.3 engine the blower control switch stop working on setting #1 and would work on all other settings now it only will work on setting #5 if you leave in on any other setting while driving depending on the speed it has cold air coming out. when on setting # 5 it blows hard and cold. this just started

I will post and not cover Rear AUX heater box. ok, and is and option

what part of this car has blower
is this HVAC blower failing on HIGH
is this manual version or climate control option.
fuse are blown in cab or in bay (engine)
fuses are first of high speed blower mode fails dead.
what IS A CKED ????? is see no hits in my ASE books on that part or device name in a car or a truck
2003 chevy tahoe , no engine /trans told. (this dictates fuse boxes)
my guess HVAC topic but no sure, what fan/blower or turbo this is.
climate control model has left and right controls and all differenet wiring max. differ.
fuse Hvac1, hvac-ECas, and fuse BOWER< yes 3 fuse must not be blown and the BCM is the brain here.
not scanning the PCM to see BCM errors is a huge error in testing
manual controls the resistor block uses a relay to send 12dc to he blower set to HIGH. all resistors bad ,high still works.

here are the 4 things to fail;
4 is good so 3 things, 2 fuses,
#3 is relay. to fail. a volt meter finds this easy for sure reading this page in the SM.below 3 pins on relay are at 12v.
so are pin F and G 12vdc if not input to them is bad.
not counting bad wires.,

Hello Chuck Womble,

Admit it...
DRIVER'S DOOR switch takes the most
abuse on the planet.

(alcohol, true love, regular chaos or old age:
snow + rain + dirt + coffee) = dirty abused switch))

A healthy BATTER would probably feel better after
a DEEP CYCLE discharge/charge...

That BATTERY WAS ALREADY done.

Make sure the NEW BATTERY terminals are
clean & tight...

WD40 the door switch (doubtless the driver door
that was open all night... (with power off)).

If cycling the switch does not bring it back to life
Get a new switch... while they are still plentiful.

Rockauto window switches
2003 CHEVROLET TAHOE 5 3L V8 Power Window Switch RockAuto

Battery terminal washers
Amazon com Road Power 0989 Anti Corrosion Fiber Washers 1 Pack 2 Washers 6...

Carnac the Magnificent

Blower motor relay , resistor , control module . any one of these could be the culprit . You have to test to determine which one is at fault ! Do you have a DVOM - digital volt ohm meter an do you know how to use it ? Heater Blower Motor Troubleshooting Blower Motor Problems Auto Repair Help

problem in your blower switch

hi

the problem lies with the selector switch.there is some short circuiting taking place inside the switch.so please replace the selector switch.

if my information was usefull please rate me

hello there:
there could be a couple of things wrong try checking you're blower motor to make sure you are getting any power to that point with switch turned to one of the lower setting if no power it could be the switch in the dash if there is power than it will more than likely to a bad fan blower...hope this helps you out sincerely D.Jones...

A/C clutch might be stuck on, on the compressor itself

DIOD IN FAN SWITCH GONE NEED REPLACEMENT

souns like a bad blower resistor.the resistor controls the different speeds.sometimes every speed except the highest will stop working.the blower resistor is almost always near the blower motor.

Look at the connector at the blower resistor. They melt. Bottom of right side of dash under the black close out panel. GM sells a repair kit for this.