2004 Yukon Denali - Help needed soon

Hey All....

Here's the deal...

Pulled into the garage and turned the car off.
The fan motor won't stop running! Restarted, pushed the OFF button again, that shut down the LED screen...but not the blower....which kept going even with the key out.

So...no clue what to do. I pulled the blower fuse to keep the battery from dying but need heat to drive around tomorrow.

Any insight would be most welcome!

Regards

Steve

Hi Steve, this is for the main blower, there is a similar procedure for the aux blower.
Hope this helps, take care, Eggert :bananasmi

HVAC Systems - Manual 1-197
Blower Motor Always On
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
2. This step checks for continuous operation of the blower motor.
3. This step tests for a short to voltage in the blower motor control circuits.

Blower Motor Always On

Schematic Reference: HVAC Schematics (Blower Controls - Primary) or HVAC Schematics (Compressor Controls - All Models) or HVAC Schematics (Air Delivery Controls - Primary) or HVAC Schematics (Blower Controls - Auxiliary) or HVAC Schematlcs (Air Delivery Controls-Auxiliary)
DEFINITION: The blower motor is on while the blower motor switch is in the OFF position,

Step 1
Did you review the HVAC operation and perform the necessary inspections?
Yes Goto Step 2
No Go to Symptoms - HVAC Systems - Manual

Step 2
1. Turn ON the ignition, with the engine OFF. 2. Place the mode selector to the vent position. 3. Place the blower motor switch to the OFF position. Is the blower motor OFF?
Yes Go to Testing for intermittent and Poor Connections in Wiring Systems
No Go to Step 3

Step 3
Important: The blower motor switch must remain in the OFF position during this step.
1. Turn OFF the ignition.
2. Disconnect the blower motor resistor assembly connector C1.
3. Turn On the ignition, with the engine OFF.
4. Probe each blower motor control circuit with a test lamp that is connected to a good ground.
Did the test lamp illuminate while connected to any of the blower motor control circuits?
Yes Go to Step 4
No Go to Step 5

Step 4
Test the appropriate blower motor control circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Yes Go to Step 9
No Go to Step 6

Step 5
Inspect for poor connections at the harness connectors of the blower motor resistor assembly. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Yes Go to Step 9
No Go to Step 7

Step 6
Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition? :
Yes Go to Step 9
No Go to Step 8

Step 7
Replace the blower motor resistor assembly. Refer to Blower Motor Resistor Replacement in Heating, Ventilation and Air Conditioning.
Did you complete the replacement?
Yes Go to Step 9
No —

Step 8
Replace the HVAC control module. Refer to HVAC Control Assembly Replacement (Heat Only) or HVAC Control Assembly Replacement (Heat and A/C).
Did you complete the replacement?
Yes Go to Step 9
No —

Step 9
Operate the system in order to verify the repair. Did you correct the condition?
Yes System OK
No Go to Step 2