Question about 1990 Cadillac Eldorado

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I have a 1990 Cadillac Eldorado with no heat

I have recently discovered that there is no power going to the blower motor hence the "no heat" thing. It was tested at the connector going into the blower motor. Also all the other fuses light up with a tester in the fuse box except the blower motor one. The fuse does appear to be good. What should my next step be?

Jeff M.

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Need location for blower switch&resistor pack 1990 eldorado.

Posted on Mar 27, 2009


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Where is the blower motor relay located on 1997 eldorado

I believe the blower relay is located in the interior fuse panel behind the passenger rear seat. Must be accessed from the trunk.

The following link has a video that will help you... good luck.
Interior Fuse Box Location 1992 2002 Cadillac Eldorado 2000 Cadillac...

Jun 11, 2017 | 1997 Cadillac Eldorado

1 Answer

The ventilation fan for heat/ac is not working. The fuses all seem the be ok. Any thing else to look for

Did you check the proper fuses for voltage? Some fuses are hot all the time, some go hot with the key on. Even if fuses are good, if no voltage the circuit is still dead. I guess your talking about the blower motor? Can you hear it running? I don't know if you auto hvac or manual hvac? I don't know if your talking about front or rear blower motor?
Get at the blower motor, if two wire connector, that should be voltage and ground. Turn on the hvac controls, check for voltage and ground at the blower motor connector. If good voltage and ground with no blower action, suspect the blower motor.

It is possible to use jumper wires from the battery for voltage and ground to blower motor connector, just for testing to see if blower motor will run, use an inline fuse, just in case.
If you want wiring diagram, I need more info.

Oct 02, 2016 | 2007 Honda Odyssey

2 Answers

A/c blower motor works if I pull power and plug back in until I cut engine off. Then I have to repeat process

Daryl, You may want to check the blower relay/ just switch with one of same type and try and if OK, problem could be the blower motor, wires/plug loose,damaged,burnt or a faulty blower motor resistor. Second link has some trouble shooting of a overheating wire problem, that is to be common in these trucks. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
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Jul 19, 2016 | 2003 Chevrolet Silverado 1500

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Blower motor is not getting power. I've replaced Blower motor and resistor. I've replaced all fuses in the A/C system. Checked the fan relays as well. Any ideas?

When you say blower motor you mean the motor that blows heat into the cabin inside the vehicle not the cooling fans for the radiator. I ask because mention relays /more then 1
I find that with blower motors its usellyI not the motor or resistor .The motor will spin with no bearings left in it will make a lot of noise but spin .The resistor olny on most vehicles comes into play on high speed setting olny .
The most common problem is bad connections to the motor it self 9 out of 10 times .Turn the key to run don't start but the fan control on high start wiggleing the connector and the wires around if the motor starts to spin this is the problem .
If not that 1 out of 10 times is likely related to the INT control switch eighter the switch is not being feed power or the switch is shorted inside .
Do you have a test light HOT to GROUND or a muility meter if so you can test for voltage to the connector that plugs into the control switch .No voltage then the problem is fearther back in the system .
Problems like this need some though before things are replaced . You need a starting point a basic understanding of how the circuit works . You start replaceing things to early you end up lost .
Try the wiggleing connector thing its likely your problem.

Apr 11, 2015 | 2005 Toyota Corolla

1 Answer

Wil the blower come on If I need freon in my 1999 Cadillac Eldorado ??

NO! The Freon level doesn't affect blower motor. You just won't get cool air. Check the fuse or relay.

Jul 10, 2014 | 1996 Cadillac Eldorado

1 Answer

How to remove blower motor 1997 cadillac eldorado


Dec 12, 2013 | 1990 Cadillac Fleetwood

1 Answer

Air and heat blower will not come on. 1998 sonoma 2.2l

start by checking fuse. if fuse is good, aquire a test light, check the test light on the battery to make sure the test light works. Power to ground = light. access blower motor under pass-side dash panel.(probablly have to remove underdash cover, secured with pop-in style fasteners.) locate blower motor. 2 wires w/connector Purple-power, black-ground. check for power at purple w/test light on known good ground, with ign on, and blower switch on high. if it has power, hook clip of test light to a power source, ( + on battery w a jumper wire) and probe black wire, with test light. if no light, jumper that wire to a good ground. if it lights, you have a bad b-motor. if no light on power side of blower motor, and fuse is good, check power to swith. blower circuit may have 2 fuses. 1 for high and a 2nd for the lower speeds. if switch has power to it, and power is transfered to another wire when switched, suspect the blower motor resistor. James White, White Automotive, Hopkins Mo. ASE tech, 17 yrs exp.

Feb 06, 2013 | 1998 GMC Sonoma

1 Answer

Heater doesnt work

The first thing to check would be the most common which is the blower resistor. the resistor is located on heater box next to blower. if you locate the blower then wire to blower and then follow wires back and they will lead to resistor.
A good test to do to see if it is the resistor would be with a test light you will test for power at blower, make sure to turn key on and heat on with blower switch on, then with the test light check for power at the blower.
if it is a bad blower resistor then you will have power at one wire on the connector that connects to blower motor, that means there is no ground going to blower, that ground is controlled by resistor to control the speed settings.its is the switch itself or resistor but i would say resistor, if you had a power probe you could test switch but i will not confuse you with that.
Now if there is no power to one of the blower wires then a fuse is what you will need to replace,
and the last test to be sure it is the resistor would be to use a piece of wire , make sure you know which wire had power to it, as you will be sticking the other wire, so take your wire and stick into connector at blower and take the other end and touch a good ground, you may see a little spark, thats okay. the blower should run.

Dec 21, 2012 | 2002 Pontiac Grand Prix

1 Answer

Heater and ac not blowing at all

The first thing i would check is the heater blower motor for power.If the blower motor has power then pull and wiggle on the blower motor resistors pigtail or connector but make sure the heater and fan motor and the ignition switch are turn on so you can here if the motor comes on. A lot of times these blower motor resistors get hot enough to melt the connector causing it to loose its connection.

Oct 26, 2012 | 2001 Chevrolet Silverado 2500HD

1 Answer

2000 Eldorado blower not working

Revised HVAC Blower Motor Installation Procedures

1994-1997 Cadillac Seville
1994-1999 Cadillac DeVille
1994-2002 Cadillac Eldorado

The intent of this bulletin is to provide technicians information regarding the proper installation of the Heating, Ventilation and Air Conditioning (HVAC) Module blower motor (with impeller) assembly.

The current available HVAC Module blower motor for the above listed vehicles can be identified by the three mounting holes (1). The original equipment blower motor had five mounting holes.

In order to avoid confusion and ensure a high level of customer satisfaction, when replacing an HVAC Module blower motor, refer to this bulletin for the appropriate procedure.

Eldorado/Seville-HVAC Blower Motor
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 Procedure
1. Disconnect the negative battery cable.

2. Remove the camshaft cover.

3. Remove the blower motor.

^ Disconnect connector from the blower motor.

^ Remove the blower motor screws (either 3 or 5 screws).

^ Remove the blower motor from the HVAC Module.

Installation Procedure
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 Steps 4 and 5 in the Instruction Sheet, P/N 52494110, found in the blower motor kit.

3. Install the blower motor retaining screws.


Tighten the screws to 4 N.m (35 lb in).
4. Tighten the lower heat shield retaining screws to 4 N.m (35 lb in).

5. Connect the connector to the blower motor.

6. Install the camshaft cover.

7. Connect the negative battery cable.

Oct 09, 2012 | 2000 Cadillac Eldorado

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