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93 ZJ Heater Motor
Hi Guys,
With the cold wind blowing in Kansas, I find my blower motor isn't blowing. It started just not working in the lo and medium settings, but worked okay in high. Now it's AWOL altogether. Is there a vacuum cause here maybe? I would have thought a bad motor would simply go out, but this old girl keeps surprising me. Thoughts? Thanks all. Denny |
Re: 93 ZJ Heater Motor
You are likely describing a blower motor that has worn out.
They start to draw too much power and usually blow out the resistor pack first, this kills low speeds, then they work on the direct high speed wire until they melt down and usually smoke out the heater switch or heater relay, then they sometimes have the grace to die. I normally try direct power to the motor to see if it has been put out of my misery and if it is dead, then I change it and the resistor pack. A meter can tell you if the switch has melted down or not. I put the meter on the plug for the heater and try the switch. If it only works in high, then the resistor pack is dead. If it works in all settings, you got really lucky. If it sends no power, there might be a relay to change with the relay right beside it for a test to see. If you change the relay and still no power, suspect the switch has melted. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Aug./05 http://www.imagestation.com/album/in...?id=2120343242 (More Off Road album links at bottom of the view page) D wrote: > > Hi Guys, > With the cold wind blowing in Kansas, I find my blower motor isn't blowing. > It started just not working in the lo and medium settings, but worked okay > in high. Now it's AWOL altogether. > Is there a vacuum cause here maybe? I would have thought a bad motor would > simply go out, but this old girl keeps surprising me. > Thoughts? > Thanks all. > Denny |
Re: 93 ZJ Heater Motor
You are likely describing a blower motor that has worn out.
They start to draw too much power and usually blow out the resistor pack first, this kills low speeds, then they work on the direct high speed wire until they melt down and usually smoke out the heater switch or heater relay, then they sometimes have the grace to die. I normally try direct power to the motor to see if it has been put out of my misery and if it is dead, then I change it and the resistor pack. A meter can tell you if the switch has melted down or not. I put the meter on the plug for the heater and try the switch. If it only works in high, then the resistor pack is dead. If it works in all settings, you got really lucky. If it sends no power, there might be a relay to change with the relay right beside it for a test to see. If you change the relay and still no power, suspect the switch has melted. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Aug./05 http://www.imagestation.com/album/in...?id=2120343242 (More Off Road album links at bottom of the view page) D wrote: > > Hi Guys, > With the cold wind blowing in Kansas, I find my blower motor isn't blowing. > It started just not working in the lo and medium settings, but worked okay > in high. Now it's AWOL altogether. > Is there a vacuum cause here maybe? I would have thought a bad motor would > simply go out, but this old girl keeps surprising me. > Thoughts? > Thanks all. > Denny |
Re: 93 ZJ Heater Motor
You are likely describing a blower motor that has worn out.
They start to draw too much power and usually blow out the resistor pack first, this kills low speeds, then they work on the direct high speed wire until they melt down and usually smoke out the heater switch or heater relay, then they sometimes have the grace to die. I normally try direct power to the motor to see if it has been put out of my misery and if it is dead, then I change it and the resistor pack. A meter can tell you if the switch has melted down or not. I put the meter on the plug for the heater and try the switch. If it only works in high, then the resistor pack is dead. If it works in all settings, you got really lucky. If it sends no power, there might be a relay to change with the relay right beside it for a test to see. If you change the relay and still no power, suspect the switch has melted. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Aug./05 http://www.imagestation.com/album/in...?id=2120343242 (More Off Road album links at bottom of the view page) D wrote: > > Hi Guys, > With the cold wind blowing in Kansas, I find my blower motor isn't blowing. > It started just not working in the lo and medium settings, but worked okay > in high. Now it's AWOL altogether. > Is there a vacuum cause here maybe? I would have thought a bad motor would > simply go out, but this old girl keeps surprising me. > Thoughts? > Thanks all. > Denny |
Re: 93 ZJ Heater Motor
There is no vacuum involved. There is a resistor that controls the
speed of the motor. That's the first thing the manual tells you to check when the motor doesn't operate at the selected speed. You need to run the on-board diagnostics if you have ATC. ---- On Fri, 02 Dec 2005 15:28:51 GMT, "D" <dpfer@r.com> wrote: >Hi Guys, >With the cold wind blowing in Kansas, I find my blower motor isn't blowing. >It started just not working in the lo and medium settings, but worked okay >in high. Now it's AWOL altogether. >Is there a vacuum cause here maybe? I would have thought a bad motor would >simply go out, but this old girl keeps surprising me. >Thoughts? >Thanks all. >Denny > |
Re: 93 ZJ Heater Motor
There is no vacuum involved. There is a resistor that controls the
speed of the motor. That's the first thing the manual tells you to check when the motor doesn't operate at the selected speed. You need to run the on-board diagnostics if you have ATC. ---- On Fri, 02 Dec 2005 15:28:51 GMT, "D" <dpfer@r.com> wrote: >Hi Guys, >With the cold wind blowing in Kansas, I find my blower motor isn't blowing. >It started just not working in the lo and medium settings, but worked okay >in high. Now it's AWOL altogether. >Is there a vacuum cause here maybe? I would have thought a bad motor would >simply go out, but this old girl keeps surprising me. >Thoughts? >Thanks all. >Denny > |
Re: 93 ZJ Heater Motor
There is no vacuum involved. There is a resistor that controls the
speed of the motor. That's the first thing the manual tells you to check when the motor doesn't operate at the selected speed. You need to run the on-board diagnostics if you have ATC. ---- On Fri, 02 Dec 2005 15:28:51 GMT, "D" <dpfer@r.com> wrote: >Hi Guys, >With the cold wind blowing in Kansas, I find my blower motor isn't blowing. >It started just not working in the lo and medium settings, but worked okay >in high. Now it's AWOL altogether. >Is there a vacuum cause here maybe? I would have thought a bad motor would >simply go out, but this old girl keeps surprising me. >Thoughts? >Thanks all. >Denny > |
Re: 93 ZJ Heater Motor
Great information. Thanks so much.
Guess I'll find a cozy garage and grab my meter. Thanks again. "Mike Romain" <romainm@sympatico.ca> wrote in message news:43906B64.CCBA8316@sympatico.ca... > You are likely describing a blower motor that has worn out. > > They start to draw too much power and usually blow out the resistor pack > first, this kills low speeds, then they work on the direct high speed > wire until they melt down and usually smoke out the heater switch or > heater relay, then they sometimes have the grace to die. > > I normally try direct power to the motor to see if it has been put out > of my misery and if it is dead, then I change it and the resistor pack. > > A meter can tell you if the switch has melted down or not. I put the > meter on the plug for the heater and try the switch. If it only works > in high, then the resistor pack is dead. If it works in all settings, > you got really lucky. If it sends no power, there might be a relay to > change with the relay right beside it for a test to see. > > If you change the relay and still no power, suspect the switch has > melted. > > Mike > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > 88 Cherokee 235 BFG AT's > Canadian Off Road Trips Photos: Non members can still view! > Aug./05 http://www.imagestation.com/album/in...?id=2120343242 > (More Off Road album links at bottom of the view page) > > D wrote: > > > > Hi Guys, > > With the cold wind blowing in Kansas, I find my blower motor isn't blowing. > > It started just not working in the lo and medium settings, but worked okay > > in high. Now it's AWOL altogether. > > Is there a vacuum cause here maybe? I would have thought a bad motor would > > simply go out, but this old girl keeps surprising me. > > Thoughts? > > Thanks all. > > Denny |
Re: 93 ZJ Heater Motor
Great information. Thanks so much.
Guess I'll find a cozy garage and grab my meter. Thanks again. "Mike Romain" <romainm@sympatico.ca> wrote in message news:43906B64.CCBA8316@sympatico.ca... > You are likely describing a blower motor that has worn out. > > They start to draw too much power and usually blow out the resistor pack > first, this kills low speeds, then they work on the direct high speed > wire until they melt down and usually smoke out the heater switch or > heater relay, then they sometimes have the grace to die. > > I normally try direct power to the motor to see if it has been put out > of my misery and if it is dead, then I change it and the resistor pack. > > A meter can tell you if the switch has melted down or not. I put the > meter on the plug for the heater and try the switch. If it only works > in high, then the resistor pack is dead. If it works in all settings, > you got really lucky. If it sends no power, there might be a relay to > change with the relay right beside it for a test to see. > > If you change the relay and still no power, suspect the switch has > melted. > > Mike > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > 88 Cherokee 235 BFG AT's > Canadian Off Road Trips Photos: Non members can still view! > Aug./05 http://www.imagestation.com/album/in...?id=2120343242 > (More Off Road album links at bottom of the view page) > > D wrote: > > > > Hi Guys, > > With the cold wind blowing in Kansas, I find my blower motor isn't blowing. > > It started just not working in the lo and medium settings, but worked okay > > in high. Now it's AWOL altogether. > > Is there a vacuum cause here maybe? I would have thought a bad motor would > > simply go out, but this old girl keeps surprising me. > > Thoughts? > > Thanks all. > > Denny |
Re: 93 ZJ Heater Motor
Great information. Thanks so much.
Guess I'll find a cozy garage and grab my meter. Thanks again. "Mike Romain" <romainm@sympatico.ca> wrote in message news:43906B64.CCBA8316@sympatico.ca... > You are likely describing a blower motor that has worn out. > > They start to draw too much power and usually blow out the resistor pack > first, this kills low speeds, then they work on the direct high speed > wire until they melt down and usually smoke out the heater switch or > heater relay, then they sometimes have the grace to die. > > I normally try direct power to the motor to see if it has been put out > of my misery and if it is dead, then I change it and the resistor pack. > > A meter can tell you if the switch has melted down or not. I put the > meter on the plug for the heater and try the switch. If it only works > in high, then the resistor pack is dead. If it works in all settings, > you got really lucky. If it sends no power, there might be a relay to > change with the relay right beside it for a test to see. > > If you change the relay and still no power, suspect the switch has > melted. > > Mike > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > 88 Cherokee 235 BFG AT's > Canadian Off Road Trips Photos: Non members can still view! > Aug./05 http://www.imagestation.com/album/in...?id=2120343242 > (More Off Road album links at bottom of the view page) > > D wrote: > > > > Hi Guys, > > With the cold wind blowing in Kansas, I find my blower motor isn't blowing. > > It started just not working in the lo and medium settings, but worked okay > > in high. Now it's AWOL altogether. > > Is there a vacuum cause here maybe? I would have thought a bad motor would > > simply go out, but this old girl keeps surprising me. > > Thoughts? > > Thanks all. > > Denny |
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