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Blower not working

Tiny
MADRANGER
  • MEMBER
  • 1993 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 140,000 MILES
Where is the fan blower relay located on my car with a 4.9 liter engine?
Saturday, July 23rd, 2011 AT 2:07 AM

26 Replies

Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Hello,

The blower motor resistor in under the hood on the heater box. The blower motor is there as well. Here are some guides and diagrams so we can do some testing to confirm the failure:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

and

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (below).

Please let us know what you find.

Cheers
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Saturday, July 23rd, 2011 AT 3:27 AM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Check your voltages at the blower motor. Straight wire the motor to battery. If still inoperable the motor is bad. If it runs the A/C programmer is bad. It is behind the glove box and lower dash panels.
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Saturday, July 23rd, 2011 AT 5:06 PM
Tiny
MADRANGER
  • MEMBER
  • 5 POSTS
The blower does not come on at all. I suspected the blower resistor but then discovered that the fan should still work on high fan since the resistor is only for reducing the speed. Besides, I cannot afford to spend $150.00 for a new one just to find out if that is the problem or not.
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Saturday, July 23rd, 2011 AT 6:30 PM
Tiny
MADRANGER
  • MEMBER
  • 5 POSTS
I am not familiar with the A/C programmer. What exactly is its purpose?
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Saturday, July 23rd, 2011 AT 6:32 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Controls the complete system. If you put a power module and its not blowing. All that is left is the programmer.
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Saturday, July 23rd, 2011 AT 8:38 PM
Tiny
MADRANGER
  • MEMBER
  • 5 POSTS
Thank you for the help with the problem. I did some testing with the guides you gave and it was the programmer not giving the blower motor a signal. I replaced it and Bam! It works. Thanks 2CarPros.
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Sunday, July 24th, 2011 AT 2:58 AM
Tiny
REMSLUGGER
  • MEMBER
  • 2 POSTS
  • 1994 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 112,000 MILES
V8 front wheel drive automatic 112,000 miles.

The blower motor in my car stopped working. Checked the fuses and they were fine so I bought a new one and put it in and it is still not working. Any suggestions?
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Sunday, December 3rd, 2017 AT 8:59 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
First off check for voltage at the connector to the motor with switch in all positions getting anything.

Check for damage of the wires in the connector. These cars had a issue with them not being tight and causing high resistance and melting them up. Also, some have found that the connector on the back of the switch for selecting the fan to loosen up and not work. Check them out. If not you will have to run voltage through the connector at the switch and see if you get a response. If you do the switch could be bad.
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Sunday, December 3rd, 2017 AT 8:59 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
The black wire is ground. Check for ground there. On the red wire you should have power with key on switch on in any position and the grey with black stripe wire should have a voltage change with each position.
There is a 40 amp fuse under the hood that is for the power to the red lead.

Black wire is attached near altanator. Check for ground from that wire.

If nothing on gray and black wire If so, check fuse thers a 10 amp fuse and a 10 amp in the engine bay.

If that is all good. The controller module is bad.
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Sunday, December 3rd, 2017 AT 8:59 PM (Merged)
Tiny
IMGREGO72
  • MEMBER
  • 1 POST
  • 1992 CADILLAC DEVILLE
  • 4.9L
  • V8
  • FWD
  • AUTOMATIC
  • 138,000 MILES
Heat and blower fan inside the car stopped working. I have checked the fuses on drivers side of car underneath the dash. It started blowing cold air only but fan still worked. Shortly after the fan stopped blowing and fan controls did not respond to changes (would not switch to front defroster, auto, economy etc). What should I check?
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Sunday, December 3rd, 2017 AT 8:59 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I can talk to you about the basics. If blower motor will not work, check voltage and ground at the blower motor connector, purple wire is voltage, black wire is ground, with HVAC turned on.

You can use the climate control panel to try to access any trouble codes. Key on, press warm and off together, an 888 should show up, then an E or F, depending on PCM codes or BCM codes. Write down all codes and post, hopefully me or somebody will help with the codes. If that does not work, let us know and we will try something else.

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Sunday, December 3rd, 2017 AT 8:59 PM (Merged)
Tiny
SEAMULE
  • MEMBER
  • 2 POSTS
  • 1993 CADILLAC DEVILLE
V8 engine.

Heating and A/C fan does not work. Fuses are okay. Do not know where to find blower motor or relays. Any other suggestions?
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Sunday, December 3rd, 2017 AT 9:00 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi.
The first thing you need to do is determine if there is power to the blower motor. It is located under the dash board on the passenger side (near glove box). Let me know what you find and we will go from there.

Joe
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Sunday, December 3rd, 2017 AT 9:00 PM (Merged)
Tiny
SEAMULE
  • MEMBER
  • 2 POSTS
I received your reply to check under dash on passenger side to see if fan had power to it. Cannot find fan under dash however there is a fan access on the firewall under the hood behind the engine. Two wires going to it, red and black. Red is hot. A maxi fuse panel is directly above it. All maxi fuses are good. Under each maxi fuse are square electrical components, look like they plug in. Are these relays? How are they checked? They all have the same part number. If I remove the fan cover does that allow access to removing the fan? Is there another way to reply to your answers? Thanks for your trouble

email update: 1/5/09

I removed the cover from under the dash and could not see any access to the fan however, there was a relay center with fuses under the glove box ( had power to both sides of the fuse )and all fuses checked good. Under the hood behind the motor and against the firewall is a panel of maxi fuses and below them is a fan access cover with two wires going to it, one black and one red. The red shows power to that point. All maxi fuses check good. Under the maxi fuses are a row of square plug in electrical components ( maybe relays?). They all have the same part number. Is there a way to check these and how are they removed? Two of these units are directly under the maxi fuses for the ECM (20 amp) and blower (30 amp). Thanks for your reply.
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Sunday, December 3rd, 2017 AT 9:00 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,
It sounds like you found relays, but to the best of my knowledge, access to the motor is done under the dashboard. If you remove the panel you refered to, do you see the motor? If so, are you getting power to the motor itself?
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Sunday, December 3rd, 2017 AT 9:00 PM (Merged)
Tiny
MAHKYIA
  • MEMBER
  • 1 POST
  • 1990 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
My buttons on the temperature control panel will not work. I have checked all fuses and they are good. My fan will not turn on either. I replaced the blower motor and it still will not turn on.
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Sunday, December 3rd, 2017 AT 9:00 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
The relays should just pull out. If they are all the same part number, switch one out with the blower relay to see if that makes a difference. Also, have you gained access to the blower motor?
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Sunday, December 3rd, 2017 AT 9:00 PM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
I would be checking that the heater blower resistor has not burnt out, it is located in the right hand side of the fire wall in top of the plenum.

Mhpautos
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Sunday, December 3rd, 2017 AT 9:00 PM (Merged)
Tiny
LOCKSMITH335
  • MEMBER
  • 7 POSTS
  • 1996 CADILLAC DEVILLE
  • V8
  • 2WD
  • AUTOMATIC
  • 127,000 MILES
V8 two wheel drive automatic 127,000 miles.

Blower motor does not work. I was told to replace motor and computer for heater unit. Did both. Now the computer is used from another car. Same SN number and model numbers on control box. But no go. Tried used motor and new motor and neither spins. Tested without remounting in fan box. Everything on dash works at least it shows all controls and temperatures outside and what you want in side. I do not have a clue what gives. Can you give me some help here?
Thanks,
Tedd
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Sunday, December 3rd, 2017 AT 9:00 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Should be a fan speed resistor in the HVAC plenum near the blower motor. Test it for power in, and out with a test light. They are usually the problem, as long as all fuses are good.
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Sunday, December 3rd, 2017 AT 9:00 PM (Merged)

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