Where is the A/C heater blower fuse?

REPLACE THERMOSTAT.IF ALREADY DONE.CHECK HEATER BLOWER MOTOR SEE IF POWER GOING TO HEATER BLOWER MOTOR.IF YES BLOWER MOTOR BAD.IF NO POWER GOING TO BLOWER MOTOR CHECK AC AND HEATER CONTROL FUSE AND CHECK BLOWER MOTOR FUSE AND RELAY IF ALL IS GOOD CHECK SEE IF POWER GOING TO AC AND HEATER CONTROL SWITCH IF YES THE AC AND HEATER CONTROL SWITCH COULD BE BAD.

CHECK AC AND HEATER CONTROL FUSE. IF FUSE OKAY CHECK BLOWER SEE IF POWER GOING TO BLOWER MOTOR IF YES BLOWER MOTOR MORE LIKELY FAULTY.IF NO POWER GOING TO BLOWER MOTOR CHECK BLOWER MOTOR FUSE ANDRELAY.

CHECK BLOWER MOTOR FUSE AND RELAY.SEE IF POWER GOING TO BLOWER MOTOR YOU HAVE FAULTY BLOWER MOTOR.IF BLOWER MOTOR FUSE AND RELAY OKAY.IF NO POWER GOING TO BLOWER MOTOR BUT POWER AT AC AND HEATER CONTROL SWITCH. BLOWER MOTOR HAS POOR GROUND OR AC AND HEATER CONTROL SWITCH IS BAD.

REMOVE HEATER BLOWER MOTOR HOT WIRE BLOWER MOTOR IT.IF IT WORKS.YOUR AC AND HEATER CONTROL SWITCH IS FAULTY.CHECK HVAC FUSES AND CHECK BLOWER MOTOR RELAY.IF BLOWER MOTOR DONT WORK WHEN HOT WIRE REPLACE IT.IF ALL CHECK OUT GOOD.HAVE DEALERSHIP DO A DIAGNOSTIC TEST ON YOUR CLIMATE CONTROL SYSTEM.

Check heater fuse.
If fuse good - could be a failure of the blower fan motor or blower control switch.
If fuse bad - bad blower fan motor could have blown the fuse.
DO: check fuse, then blower motor.
Pricing: new blower motor: Duralast PM270 $43.99
new heater control switch: Duralast SW229 $46.99 (without
A/C).
I'd expect your blower resistor to be good - when they fail, the blower only will work on HIGH setting.

replace blower motor resistor module.very common problem.I've replaced hundreds in my 25yrs working with G.M.

owner manual will tell you fuse layout. If you have only high speed, you have a bad resister. 4 wires.

Resistor —Heater Blower Motor Switch Removal

1. Remove the battery (10655) ; refer to Section 414-01 .

1. Remove the battery tray.
   1. Remove the screws.
   1. Remove the battery tray.

1. Disconnect the heater blower motor switch resistor connector.

1. Remove the heater blower motor switch resistor (18591).
   1. Remove the two screws.
1. Remove the heater blower motor switch resistor.

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fuse blows. unplug heater blower motor turn ignition on, turn heater on, does fuse blow? if not need to replace heater blower motor

look in passenger foot well on blower case for 4 wire connector.



Behind right side of I/P, A/C-heater plenum


resister bad would still allow high speed. may be blower motor.

• The blower motor does not operate/does not operate correctly

• Open fuse.
• Tripped circuit breaker.
• Circuitry open/shorted.
• Heater blower motor switch (18578).
• Heater blower motor switch resistor (18591).
• Blower motor relay.
• Blower motor.

fuse in fuse box there are 2 of them 1 under hood marked fuses and 1 under dash or in glove box

happy hunting and check your book