mhinchley Posted May 9, 2006 Report Share Posted May 9, 2006 97 Deville-Digital Dash. Will the blower motor still turn on with the engine not running but key on with engine cold? Think the motor went out, but now that the car is not running I am not getting the new or old motor to turn on when plugging in. Just purchased a new motor and do not want to install if not the problem. The antifreeze is currently drained, so I cannot start the car. I do have 12.4 volts at the red lead on the plug. Link to comment Share on other sites More sharing options...
Ranger Posted May 10, 2006 Report Share Posted May 10, 2006 I believe when I changed the blower on my '97 I tested the new one before installing it by simply plugging it in and turning the key on, and turning the fan on high. Even if you had to start the car, it should be no problem to run it for a few seconds with no coolant. Have you done this before? Do you know that you'll need to rock the engine forward a bit to get enough clearance to install the new one? Link to comment Share on other sites More sharing options...
mhinchley Posted May 10, 2006 Author Report Share Posted May 10, 2006 I believe when I changed the blower on my '97 I tested the new one before installing it by simply plugging it in and turning the key on, and turning the fan on high. Even if you had to start the car, it should be no problem to run it for a few seconds with no coolant. Have you done this before? Do you know that you'll need to rock the engine forward a bit to get enough clearance to install the new one? Yeah, I am not worried about the install.............just confused as to why neither the old or new one is turning on with the key. Had no problems with the old one, before it went out. In my past experience, there was always intermittent problems before hand, where as this one, just quit. Yet I still have 12.4 volts at the plug. Wondering now if it is not a computer problem. ACM? Link to comment Share on other sites More sharing options...
BodybyFisher Posted May 10, 2006 Report Share Posted May 10, 2006 Just a thought, have you grounded the fan? 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...
mhinchley Posted May 10, 2006 Author Report Share Posted May 10, 2006 no.....it bolts in on top of rubber bushings (no metal to metal contact).................and one of the three plug terminals is a ground......so thinking that is not necassary, but I'll check it out. Pretty sure no need for an external ground though. I would jump it to the battery, but I already have power to the plug. And from what I understand...........to direct jump you need a resistor between the ground and gray wire.............and I don't know what size, nor do I have one handy. Ranger: I know I can start it for a short time........I was just wondering if the ACM needed the engine to be at a certain temp to activate the fan. Guess I never paid attention if the fan previously turned on as soon as I started the car. But common sense does tell me the fan should just run with the key on............so now I am stumped even more. Maybe I need to figure out the resitor size and test both fans off the battery and go from there. Anyone know what resistor I need? Link to comment Share on other sites More sharing options...
WarrenJ Posted May 10, 2006 Report Share Posted May 10, 2006 In my OBDI equipped 1995, ACP overide AS16 (Blower speed) allows you to vary the blower speed by selecting values between 99-0. Presumably, OBDII vehicles do something similar? Regards, Warren There is no means of avoiding the final collapse of a boom brought about by credit expansion. The alternative is only whether the crisis should come sooner as the result of a voluntary abandonment of further credit expansion, or later as a final and total catastrophe of the currency system involved. - Ludwig von Mises Link to comment Share on other sites More sharing options...
Ranger Posted May 10, 2006 Report Share Posted May 10, 2006 Jumping it directly to the battery will not work. Been there, done, that. You are correct about the ground. Fan normaly does not come on til the engine reaches something like 90 degrees but defrost should be on demand at any temp. Like I said, I am pretty sure when I tested my new one, I just layed it on the cowl, turned the key on. Not sure what I did after that. Might have been hi fan or defrost. Link to comment Share on other sites More sharing options...
mhinchley Posted May 10, 2006 Author Report Share Posted May 10, 2006 Jumping it directly to the battery will not work. Been there, done, that. You are correct about the ground. Fan normaly does not come on til the engine reaches something like 90 degrees but defrost should be on demand at any temp. Like I said, I am pretty sure when I tested my new one, I just layed it on the cowl, turned the key on. Not sure what I did after that. Might have been hi fan or defrost. Maybe there is a chance I got a bad fan from parts store? Think I am gonna take it back.....get another and try it. If it no worky either, then I know there is another problem. Yeah I read a few former posts on running off battery. But one said something about using a resistor with the gray wire and black I beleive. Of course I know these are solid state and I really don't want to screw it up by trying to jump the new one anyway......without a diagram of the fan. So I am just gonna take it back and try another. Weird that I have power at the plug though. Does the gray wire work through the ground or the hot. Just would think there should be a way to check with meter...........but I am not even sure how the gray wire works (ground or hot). Link to comment Share on other sites More sharing options...
KHE Posted May 10, 2006 Report Share Posted May 10, 2006 The grey wire is a pulse width modulated signal from the ACM. The duty cycle dictates the fan speed. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
mhinchley Posted May 10, 2006 Author Report Share Posted May 10, 2006 Took the new fan back. Came home, started the car after filling coolant system. Let it warm up to 160. Plugged in original fan and it spun intermittently. Went and bought an AC Delco ($250) fan, came home, plugged in.........spins like a top. Still a bit confused..........but atleast it works. Now just need to install. Oh well, atleast not the ACM. Link to comment Share on other sites More sharing options...
Ranger Posted May 10, 2006 Report Share Posted May 10, 2006 Just lends more credence to Bbob's aftermarket theory. Link to comment Share on other sites More sharing options...
WarrenJ Posted May 10, 2006 Report Share Posted May 10, 2006 Just lends more credence to Bbob's aftermarket theory. Jeeze, you would think the aftermarket industry could get a simple blower motor right. I realize it's PWM, but that hasn't been a secret since the '50s. Oh well, you live and learn. Regards, Warren There is no means of avoiding the final collapse of a boom brought about by credit expansion. The alternative is only whether the crisis should come sooner as the result of a voluntary abandonment of further credit expansion, or later as a final and total catastrophe of the currency system involved. - Ludwig von Mises Link to comment Share on other sites More sharing options...
mhinchley Posted May 11, 2006 Author Report Share Posted May 11, 2006 Installed it in less then 10 minutes. The newer AC Delco has a more flexible fan blade and was able to massage it into the hole without moving the engine, displacing any wires, or cutting the housing. Thanks for all the input. Link to comment Share on other sites More sharing options...
Ranger Posted May 11, 2006 Report Share Posted May 11, 2006 Hmm, I did the same thing ........the first time. I say first time because apparently I massaged it too much and 6 months later the squirrel cage literaly exploded. I think I even posted pictures here. The second install went a little faster because I was expirienced Link to comment Share on other sites More sharing options...
KHE Posted May 11, 2006 Report Share Posted May 11, 2006 When I did the job on my '96 about 5 years ago, I had a hell of a time installing the new blower - the squirrel cage was slightly larger than the original but I did it without cutting the housing. If I ever had to do the job again, I'd just remove the dogbones and lower/tilt the cradle to gain additional room. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
Ranger Posted May 11, 2006 Report Share Posted May 11, 2006 Kevin, No need to lower the cradle. After removing the dog bones, replace one with a turn buckle and pull the engine forward an inch or two. That will give you just enough clearance to wiggle the new one in. Link to comment Share on other sites More sharing options...
KHE Posted May 11, 2006 Report Share Posted May 11, 2006 I'll remember that - I shouldn't need to repeat the job on the '96 as it has the new design blower but the '97 still has the old style blower. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
WarrenJ Posted May 11, 2006 Report Share Posted May 11, 2006 I could be *very* wrong on this, however I seem to recall someone having said that connecting the grey (PWM) wire to ground through a 1000 ohm resistor would cause the fan to operate. I don't remember having seen a resolution on that question. Maybe someone with a blower motor and a 12V supply might answer? Regards, Warren There is no means of avoiding the final collapse of a boom brought about by credit expansion. The alternative is only whether the crisis should come sooner as the result of a voluntary abandonment of further credit expansion, or later as a final and total catastrophe of the currency system involved. - Ludwig von Mises Link to comment Share on other sites More sharing options...
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