I think if you run the heater on recirculating air too long, it can
overheat the system, but you could have a good point about an old motor
starting to draw too much.

Our motor went that way and killed the switch. It melted it down.
Resistor pack stayed ok.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Dave wrote:
>
> I always wonder why the resistor pack blows that thermo fuse???
> I was told it is caused by a blower that demands a little too much current.
> :-(
>
> Keep your old pack and install a new fuse in it. I believe that Radio Shack
> may sell them cheaply.
> later,
> dave
>
> "Gary B." <jeepnmon@cinci.rr.com> wrote in message
> news:Rbcbb.10121$KJ5.251@fe2.columbus.rr.com...
> > Well, I found the problem. It was the resistor pack. Got one from the
> > dealer today for $17 and some change. Installed it and voila, I have a
> > multi-speed blower once again! Awesome!
> > Thank you so much for your help with this!
> >
> > Regards,
> > Gary B.
> >
> >
> > " Stephen Cowell" <scowell@sbcglobal.net> wrote in message
> > news:VM0bb.1320$Q63.249@newssvr23.news.prodigy.com ...
> > >
> > > "Gary B." <jeepnmon@cinci.rr.com> wrote in message
> > > news:umZab.15408$uJ2.8084@fe3.columbus.rr.com...
> > > > I would appreciate any help or advise that anyone could give me to fix
> > > this
> > > > problem I'm having with my 89 Cherokee. My blower fan works on High
> > speed
> > > > only and not at all on the lower speeds. Would this mean my switch is
> > > "bad"
> > > > or the resistor needsreplacing? Is there any way to fix/clean the
> > switch
> > > > short of replacing it?
> > >
> > > Could be switch or resistor pack... you'll have to troubleshoot
> > > it. Easiest would be to pull the resistor pack and examine it...
> > > basically pieces of coiled nichrome wire. The wire should be
> > > solid; you should get low ohms with an ohmmeter check.
> > >
> > > Some resistor packs have a temperature limiting fuse,
> > > if the pack gets too hot, the fuse opens and voila,
> > > you need a new pack. Bypassing the fuse to
> > > repair the pack is not for the faint of heart.
> > > __
> > > Steve
> > > .
> > >
> > >
> >
> >

 

FYI, I also had to replace the blower within the past week. For a few
months before I owned the XJ, you would run the blower and could here a
bearing/grinding noise coming from the blower. Maybe this helped the
resistor pack to an early grave??

Regards,
Gary


"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3F6DB32B.7AC6CD24@sympatico.ca...
> I think if you run the heater on recirculating air too long, it can
> overheat the system, but you could have a good point about an old motor
> starting to draw too much.
>
> Our motor went that way and killed the switch. It melted it down.
> Resistor pack stayed ok.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Dave wrote:
> >
> > I always wonder why the resistor pack blows that thermo fuse???
> > I was told it is caused by a blower that demands a little too much
current.
> > :-(
> >
> > Keep your old pack and install a new fuse in it. I believe that Radio
Shack
> > may sell them cheaply.
> > later,
> > dave
> >
> > "Gary B." <jeepnmon@cinci.rr.com> wrote in message
> > news:Rbcbb.10121$KJ5.251@fe2.columbus.rr.com...
> > > Well, I found the problem. It was the resistor pack. Got one from
the
> > > dealer today for $17 and some change. Installed it and voila, I have
a
> > > multi-speed blower once again! Awesome!
> > > Thank you so much for your help with this!
> > >
> > > Regards,
> > > Gary B.
> > >
> > >
> > > " Stephen Cowell" <scowell@sbcglobal.net> wrote in message
> > > news:VM0bb.1320$Q63.249@newssvr23.news.prodigy.com ...
> > > >
> > > > "Gary B." <jeepnmon@cinci.rr.com> wrote in message
> > > > news:umZab.15408$uJ2.8084@fe3.columbus.rr.com...
> > > > > I would appreciate any help or advise that anyone could give me to
fix
> > > > this
> > > > > problem I'm having with my 89 Cherokee. My blower fan works on
High
> > > speed
> > > > > only and not at all on the lower speeds. Would this mean my
switch is
> > > > "bad"
> > > > > or the resistor needsreplacing? Is there any way to fix/clean the
> > > switch
> > > > > short of replacing it?
> > > >
> > > > Could be switch or resistor pack... you'll have to troubleshoot
> > > > it. Easiest would be to pull the resistor pack and examine it...
> > > > basically pieces of coiled nichrome wire. The wire should be
> > > > solid; you should get low ohms with an ohmmeter check.
> > > >
> > > > Some resistor packs have a temperature limiting fuse,
> > > > if the pack gets too hot, the fuse opens and voila,
> > > > you need a new pack. Bypassing the fuse to
> > > > repair the pack is not for the faint of heart.
> > > > __
> > > > Steve
> > > > .
> > > >
> > > >
> > >
> > >

 

FYI, I also had to replace the blower within the past week. For a few
months before I owned the XJ, you would run the blower and could here a
bearing/grinding noise coming from the blower. Maybe this helped the
resistor pack to an early grave??

Regards,
Gary


"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3F6DB32B.7AC6CD24@sympatico.ca...
> I think if you run the heater on recirculating air too long, it can
> overheat the system, but you could have a good point about an old motor
> starting to draw too much.
>
> Our motor went that way and killed the switch. It melted it down.
> Resistor pack stayed ok.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Dave wrote:
> >
> > I always wonder why the resistor pack blows that thermo fuse???
> > I was told it is caused by a blower that demands a little too much
current.
> > :-(
> >
> > Keep your old pack and install a new fuse in it. I believe that Radio
Shack
> > may sell them cheaply.
> > later,
> > dave
> >
> > "Gary B." <jeepnmon@cinci.rr.com> wrote in message
> > news:Rbcbb.10121$KJ5.251@fe2.columbus.rr.com...
> > > Well, I found the problem. It was the resistor pack. Got one from
the
> > > dealer today for $17 and some change. Installed it and voila, I have
a
> > > multi-speed blower once again! Awesome!
> > > Thank you so much for your help with this!
> > >
> > > Regards,
> > > Gary B.
> > >
> > >
> > > " Stephen Cowell" <scowell@sbcglobal.net> wrote in message
> > > news:VM0bb.1320$Q63.249@newssvr23.news.prodigy.com ...
> > > >
> > > > "Gary B." <jeepnmon@cinci.rr.com> wrote in message
> > > > news:umZab.15408$uJ2.8084@fe3.columbus.rr.com...
> > > > > I would appreciate any help or advise that anyone could give me to
fix
> > > > this
> > > > > problem I'm having with my 89 Cherokee. My blower fan works on
High
> > > speed
> > > > > only and not at all on the lower speeds. Would this mean my
switch is
> > > > "bad"
> > > > > or the resistor needsreplacing? Is there any way to fix/clean the
> > > switch
> > > > > short of replacing it?
> > > >
> > > > Could be switch or resistor pack... you'll have to troubleshoot
> > > > it. Easiest would be to pull the resistor pack and examine it...
> > > > basically pieces of coiled nichrome wire. The wire should be
> > > > solid; you should get low ohms with an ohmmeter check.
> > > >
> > > > Some resistor packs have a temperature limiting fuse,
> > > > if the pack gets too hot, the fuse opens and voila,
> > > > you need a new pack. Bypassing the fuse to
> > > > repair the pack is not for the faint of heart.
> > > > __
> > > > Steve
> > > > .
> > > >
> > > >
> > >
> > >

 

Very likely. As they wear out, they draw a lot of power and generate
heat in the lines.

Mike

"Gary B." wrote:
>
> FYI, I also had to replace the blower within the past week. For a few
> months before I owned the XJ, you would run the blower and could here a
> bearing/grinding noise coming from the blower. Maybe this helped the
> resistor pack to an early grave??
>
> Regards,
> Gary
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3F6DB32B.7AC6CD24@sympatico.ca...
> > I think if you run the heater on recirculating air too long, it can
> > overheat the system, but you could have a good point about an old motor
> > starting to draw too much.
> >
> > Our motor went that way and killed the switch. It melted it down.
> > Resistor pack stayed ok.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > Dave wrote:
> > >
> > > I always wonder why the resistor pack blows that thermo fuse???
> > > I was told it is caused by a blower that demands a little too much
> current.
> > > :-(
> > >
> > > Keep your old pack and install a new fuse in it. I believe that Radio
> Shack
> > > may sell them cheaply.
> > > later,
> > > dave
> > >
> > > "Gary B." <jeepnmon@cinci.rr.com> wrote in message
> > > news:Rbcbb.10121$KJ5.251@fe2.columbus.rr.com...
> > > > Well, I found the problem. It was the resistor pack. Got one from
> the
> > > > dealer today for $17 and some change. Installed it and voila, I have
> a
> > > > multi-speed blower once again! Awesome!
> > > > Thank you so much for your help with this!
> > > >
> > > > Regards,
> > > > Gary B.
> > > >
> > > >
> > > > " Stephen Cowell" <scowell@sbcglobal.net> wrote in message
> > > > news:VM0bb.1320$Q63.249@newssvr23.news.prodigy.com ...
> > > > >
> > > > > "Gary B." <jeepnmon@cinci.rr.com> wrote in message
> > > > > news:umZab.15408$uJ2.8084@fe3.columbus.rr.com...
> > > > > > I would appreciate any help or advise that anyone could give me to
> fix
> > > > > this
> > > > > > problem I'm having with my 89 Cherokee. My blower fan works on
> High
> > > > speed
> > > > > > only and not at all on the lower speeds. Would this mean my
> switch is
> > > > > "bad"
> > > > > > or the resistor needsreplacing? Is there any way to fix/clean the
> > > > switch
> > > > > > short of replacing it?
> > > > >
> > > > > Could be switch or resistor pack... you'll have to troubleshoot
> > > > > it. Easiest would be to pull the resistor pack and examine it...
> > > > > basically pieces of coiled nichrome wire. The wire should be
> > > > > solid; you should get low ohms with an ohmmeter check.
> > > > >
> > > > > Some resistor packs have a temperature limiting fuse,
> > > > > if the pack gets too hot, the fuse opens and voila,
> > > > > you need a new pack. Bypassing the fuse to
> > > > > repair the pack is not for the faint of heart.
> > > > > __
> > > > > Steve
> > > > > .
> > > > >
> > > > >
> > > >
> > > >

 

Very likely. As they wear out, they draw a lot of power and generate
heat in the lines.

Mike

"Gary B." wrote:
>
> FYI, I also had to replace the blower within the past week. For a few
> months before I owned the XJ, you would run the blower and could here a
> bearing/grinding noise coming from the blower. Maybe this helped the
> resistor pack to an early grave??
>
> Regards,
> Gary
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3F6DB32B.7AC6CD24@sympatico.ca...
> > I think if you run the heater on recirculating air too long, it can
> > overheat the system, but you could have a good point about an old motor
> > starting to draw too much.
> >
> > Our motor went that way and killed the switch. It melted it down.
> > Resistor pack stayed ok.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > Dave wrote:
> > >
> > > I always wonder why the resistor pack blows that thermo fuse???
> > > I was told it is caused by a blower that demands a little too much
> current.
> > > :-(
> > >
> > > Keep your old pack and install a new fuse in it. I believe that Radio
> Shack
> > > may sell them cheaply.
> > > later,
> > > dave
> > >
> > > "Gary B." <jeepnmon@cinci.rr.com> wrote in message
> > > news:Rbcbb.10121$KJ5.251@fe2.columbus.rr.com...
> > > > Well, I found the problem. It was the resistor pack. Got one from
> the
> > > > dealer today for $17 and some change. Installed it and voila, I have
> a
> > > > multi-speed blower once again! Awesome!
> > > > Thank you so much for your help with this!
> > > >
> > > > Regards,
> > > > Gary B.
> > > >
> > > >
> > > > " Stephen Cowell" <scowell@sbcglobal.net> wrote in message
> > > > news:VM0bb.1320$Q63.249@newssvr23.news.prodigy.com ...
> > > > >
> > > > > "Gary B." <jeepnmon@cinci.rr.com> wrote in message
> > > > > news:umZab.15408$uJ2.8084@fe3.columbus.rr.com...
> > > > > > I would appreciate any help or advise that anyone could give me to
> fix
> > > > > this
> > > > > > problem I'm having with my 89 Cherokee. My blower fan works on
> High
> > > > speed
> > > > > > only and not at all on the lower speeds. Would this mean my
> switch is
> > > > > "bad"
> > > > > > or the resistor needsreplacing? Is there any way to fix/clean the
> > > > switch
> > > > > > short of replacing it?
> > > > >
> > > > > Could be switch or resistor pack... you'll have to troubleshoot
> > > > > it. Easiest would be to pull the resistor pack and examine it...
> > > > > basically pieces of coiled nichrome wire. The wire should be
> > > > > solid; you should get low ohms with an ohmmeter check.
> > > > >
> > > > > Some resistor packs have a temperature limiting fuse,
> > > > > if the pack gets too hot, the fuse opens and voila,
> > > > > you need a new pack. Bypassing the fuse to
> > > > > repair the pack is not for the faint of heart.
> > > > > __
> > > > > Steve
> > > > > .
> > > > >
> > > > >
> > > >
> > > >