Rod Posted February 8, 2009 Report Share Posted February 8, 2009 I have already replaced the fan motor 2 years ago. Now it is starting to not turn on. Sometimes it won't turn on during an entire trip or it will take time to turn on or just shut off any time it is being driven. This is driving me nuts! I am curious if the circuit board inside the motor is the culprit. Also is there anyone who rebuilds these fan motors. Any information is greatly appreciated. Rod Link to comment Share on other sites More sharing options...
BodybyFisher Posted February 8, 2009 Report Share Posted February 8, 2009 Check the plug to see if its melted. However, the problem is that the spark plug wire high voltage transients damage the controller board. Look to see if your fan has what looks like a tin foil heat sink/shield over it, that shield is suppose to shunt away the transients. Check the plug for damage Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
Rod Posted February 11, 2009 Author Report Share Posted February 11, 2009 Check the plug to see if its melted. However, the problem is that the spark plug wire high voltage transients damage the controller board. Look to see if your fan has what looks like a tin foil heat sink/shield over it, that shield is suppose to shunt away the transients. Check the plug for damage I had the fan out last weekend. The plug was fine however I didn't see any "foil". I do have the plug wires routed away from the motor. I am assuming by controller board you are talking about the board inside the fan itself. I think now I am in the market for a new fan motor. Any ideas where reasonably priced motors can be purchased? Thanks Rod Link to comment Share on other sites More sharing options...
BodybyFisher Posted February 11, 2009 Report Share Posted February 11, 2009 Check the plug to see if its melted. However, the problem is that the spark plug wire high voltage transients damage the controller board. Look to see if your fan has what looks like a tin foil heat sink/shield over it, that shield is suppose to shunt away the transients. Check the plug for damage I had the fan out last weekend. The plug was fine however I didn't see any "foil". I do have the plug wires routed away from the motor. I am assuming by controller board you are talking about the board inside the fan itself. I think now I am in the market for a new fan motor. Any ideas where reasonably priced motors can be purchased? Thanks Rod It sounds like you might have an old style motor, if you don't see a foil like square cover that faces forward. If the ignition wires lean up against it, as you know high voltage can leak and damage the sensitive components.. You can not hook the fan up to 12V to see if it will run like the old days. Kevin (KHE) understands this subject more that I do. It has something to do with pulsed width modulation? KHE can explain the deal with the motor controller (yes its on the motor).. How old is that motor? I would hate for you to run out and have it be something else. Did it act up for awhile kicking on and off intermittantly before it stopped? Or did it just stop? Did you check fuses? Lets see what KHE has to say Ill flag him over. If I am not mistaken, he was involved with repairing a controller's capacitors Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
KHE Posted February 11, 2009 Report Share Posted February 11, 2009 When you replaced the blower motor, was it the new style - without the 1/2" thick "inertial" plate attached? If so, dod you install the foil/fiberglass heat shield? If you did not install the heat shield, the new motor could be bad. The heat shield used to be included with the service replacement blower motor but it is now a separate part. I guess GM figures there aren't any first generation blowers out there any more. You cannot hook 12v to the blower - it has three leads - a ground, power and a control signal. The control signal is a pulse width modulated (PWM)signal from the ACM to allow infinite blower speeds. The PWM signal varies in duty cycle to allow infinite control of the blower motor. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
BodybyFisher Posted February 11, 2009 Report Share Posted February 11, 2009 Thanks Kevin, thats what I thought, thanks for explaining it Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
Ranger Posted February 11, 2009 Report Share Posted February 11, 2009 F.Y.I. OEM blower had 5 mounting bolts. New redesigned ones have 3. Link to comment Share on other sites More sharing options...
lothos Posted February 12, 2009 Report Share Posted February 12, 2009 I think you can get a motor for a decent price at rockauto.com and there's 5% discount code in the link at the bottom of this message. The shield comes separate. WARNING: I'm a total car newbie, don't be surprised if I ask a stupid question! Just trying to learn. Cheers! 5% discount code at RockAuto.com - click here for your discount! Link to comment Share on other sites More sharing options...
Rod Posted February 12, 2009 Author Report Share Posted February 12, 2009 Check the plug to see if its melted. However, the problem is that the spark plug wire high voltage transients damage the controller board. Look to see if your fan has what looks like a tin foil heat sink/shield over it, that shield is suppose to shunt away the transients. Check the plug for damage I had the fan out last weekend. The plug was fine however I didn't see any "foil". I do have the plug wires routed away from the motor. I am assuming by controller board you are talking about the board inside the fan itself. I think now I am in the market for a new fan motor. Any ideas where reasonably priced motors can be purchased? Thanks Rod It sounds like you might have an old style motor, if you don't see a foil like square cover that faces forward. If the ignition wires lean up against it, as you know high voltage can leak and damage the sensitive components.. You can not hook the fan up to 12V to see if it will run like the old days. Kevin (KHE) understands this subject more that I do. It has something to do with pulsed width modulation? KHE can explain the deal with the motor controller (yes its on the motor).. How old is that motor? I would hate for you to run out and have it be something else. Did it act up for awhile kicking on and off intermittantly before it stopped? Or did it just stop? Did you check fuses? Lets see what KHE has to say Ill flag him over. If I am not mistaken, he was involved with repairing a controller's capacitors The motor is from a 1996 Deville from a Pull-A-Parts yard. My car has 166,000 mi on it. I don't remember what mileage was on the donor. The donor did look stock. The blasted thing still works sporadically when it feels like it. You can never tell if it will work. And sometimes is just shuts off and won't come back on, or it will or not........ Link to comment Share on other sites More sharing options...
BodybyFisher Posted February 12, 2009 Report Share Posted February 12, 2009 That makes sense then, i thought you bought a new one, that was an old motor and it definately sounds like the controller is cooked... We have given you a few options above and you can always look for another motor, keep in mind to look for the NEW style motor, Mike Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
JimD Posted February 12, 2009 Report Share Posted February 12, 2009 The motor is from a 1996 Deville from a Pull-A-Parts yard. My car has 166,000 mi on it. I don't remember what mileage was on the donor. The donor did look stock. The blasted thing still works sporadically when it feels like it. You can never tell if it will work. And sometimes is just shuts off and won't come back on, or it will or not........ Are there any Diagnostic Trouble Codes set? In particular, "B" codes. Is your exterior air temperature display reasonably accurate? When the HVAC is operated in AUTO mode, the exterior air temperature is a factor in the control matrix. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
Rod Posted February 12, 2009 Author Report Share Posted February 12, 2009 The motor is from a 1996 Deville from a Pull-A-Parts yard. My car has 166,000 mi on it. I don't remember what mileage was on the donor. The donor did look stock. The blasted thing still works sporadically when it feels like it. You can never tell if it will work. And sometimes is just shuts off and won't come back on, or it will or not........ Are there any Diagnostic Trouble Codes set? In particular, "B" codes. Is your exterior air temperature display reasonably accurate? When the HVAC is operated in AUTO mode, the exterior air temperature is a factor in the control matrix. The outside temp display is close to actual. I haven't even thought of checking codes. I have checked in the past and there were no codes, except for the blasted input speed sensor code! I think it is P0717 or something like that. I have been waiting to get my tranny jack rebuilt and back together to tackle it. Link to comment Share on other sites More sharing options...
Rod Posted February 12, 2009 Author Report Share Posted February 12, 2009 My motor does have the 1/2 in. inertia plate on it. I didn't realize there is a new replacement. I'll check for pricing and see what's up. Thanks for all your help. Link to comment Share on other sites More sharing options...
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