Blower fan not working properly

MROULET1

MEMBER
1999 CADILLAC DEVILLE
4.6L
V8
2WD
AUTOMATIC
131,573 MILES

My blower motor or fan will work just fine then it will just shut of, but no sooner then it cuts off and tries to come back on.

It’s like I can hear powering back up.

Friday, November 13th, 2020 AT 5:25 AM

1 Reply

ASEMASTER6371

MECHANIC
52,797 POSTS

Good morning,

I attached the wiring diagram of the system for you. You need to do some voltage checks at the blower motor to be sure the connection is good as well as the voltage.

https://www.2carpros.com/articles/how-to-check-wiring

In the left front of the passenger compartment, behind the kick panel

I would also check the ground connection. I attached a picture of the location for you. It is G203.

Roy

The current available HVAC Module blower motor can be identified by three mounting holes. The original equipment blower motor had five mounting holes.

Caution: Before servicing any electrical component, the ignition key must be in the off or lock position and all electrical loads must be off, unless instructed otherwise in these procedures. If a tool or equipment could easily come in contact with a live exposed electrical terminal, also disconnect the negative battery cable. Failure to follow these precautions may cause personal injury and/or damage to the vehicle or its components.

Removal

1. Disconnect the negative battery cable.
2. Remove the cross-car brace.
3. Disconnect and position the ignition control module assembly out of the way.
4. Position the cross-car harness out of the way.
5. Remove the solenoid purge valve.
6. Disconnect the connector from the blower motor.
7. Remove the blower motor screws (either 3 or 5 screws).
8. Remove the blower motor from the HVAC Module.

Installation

1. If present, remove the 2 ribs located on the barrier. Refer to step 3 and the illustrations in the Instruction Sheet, P/N, 52494110, found in the blower motor kit.

Important: Ensure the blower motor gasket makes a complete seal around the blower motor.

2. Install the new blower motor with heat shield. Refer to step 4 and 5 in the Instruction Sheet, P/N, 52494110, found in the blower motor kit.
3. Install the blower motor retaining screws to 4 Nm (35 in. lbs.)
4. Tighten the lower shield retaining screws to 4 Nm (35 in. lbs.)
5. Connect the connector to the blower motor.
6. Install the solenoid purge valve.
7. Reposition and connect the ignition control module assembly.
8. Install the cross-car brace.
9. Connect the negative battery cable.

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