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#1
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Dead AC/heater blower, 2000 Cherokee
Hello all, I have a 2000 Cherokee. My heater/AC blower won't turn on. I
had a dead battery and a blown fused wire (idiot with a jump pack). A battery shop replaced the battery and wire but I picked it up after hours and when I tried to turn on the heat - no fan. The radio was dead too, I fixed that by replacing a blown fuse. The shop is pretty much no help and two hours away, all they say is "bring it in", yeah right, drive four hours for a $10 part). The fuse marked "blower" 40AMP, in the power distribution center is fine. A friend suggested it may be a relay, the question is which one and where and how would I test it (I have a multimeter, just no idea how to test a relay). I realize I could also have a fried wire somewhere but hoping for the relay. Any other thoughts? Thanks, Aaron |
#3
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L=2EW. Hughes III (=DFill) wrote: > http://www.billhughes.com/blower.pdf Thanks, just what I needed. The relay was indeed blown with some visible scorching on 87 and 87a. Unfortunatly replacing the relay did not fix the problem. I tried the "relay circuit test" as outlined in the manual above but am a bit confused. It says there should be voltage to cavity 30 at all times, there is not. There is voltage to cavity 87 which the guide seems to say there should not be. Do I have a fried wire here? Thanks, Aaron |
#4
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wrote: > L.W. Hughes III (=DFill) wrote: > > http://www.billhughes.com/blower.pdf > I'm getting closer to getting this thing fixed. The blower itself works fine if I put a jumper across the main relay cavities. The relay itself tests out OK. I found a blown 15A fuse, #25, in the fuse block. I replaced it but it blows as soon as the ignition is turned on. When I put a jumper across it the relay energized (I heard it click) and the blower worked properly. Anyone know why this fuse would keep blowing out? Thanks, Aaron |
#5
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did pass the time by typing:
> wrote: >> L.W. Hughes III (ßill) wrote: >>> http://www.billhughes.com/blower.pdf >> > I'm getting closer to getting this thing fixed. > > The blower itself works fine if I put a jumper across the main relay > cavities. The relay itself tests out OK. > > I found a blown 15A fuse, #25, in the fuse block. I replaced it but it > blows as soon as the ignition is turned on. When I put a jumper across > it the relay energized (I heard it click) and the blower worked > properly. > > Anyone know why this fuse would keep blowing out? Fuses blow to prevent the wires from melting and catching fire. So, that means something down the line is pulling way too much current. That can be a motor that has shorted windings. Motors that fail this way still work but they draw a lot of current. Disconnect the motor, put in a new fuse, and try again. If it doesn't blow it's the motor. If it blows then I dunno, need a schematic to help you any further. -- DougW |
#6
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Ditto.
God Bless America, ßill O|||||||O http://www.billhughes.com/ DougW wrote: > > Fuses blow to prevent the wires from melting and catching fire. > > So, that means something down the line is pulling way too much > current. That can be a motor that has shorted windings. Motors > that fail this way still work but they draw a lot of current. > > Disconnect the motor, put in a new fuse, and try again. If it > doesn't blow it's the motor. If it blows then I dunno, need a > schematic to help you any further. > > -- > DougW |
#7
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i just checked in a manual the 25 fuse is for the factory amp for the radio
it has no connectiopn to the hvac of the jeep do u have one and does it work and do u have a aftermarket radio in the jeep??? DougW wrote: > did pass the time by typing: > > wrote: > >> L.W. Hughes III (ßill) wrote: > >>> http://www.billhughes.com/blower.pdf > >> > > I'm getting closer to getting this thing fixed. > > > > The blower itself works fine if I put a jumper across the main relay > > cavities. The relay itself tests out OK. > > > > I found a blown 15A fuse, #25, in the fuse block. I replaced it but it > > blows as soon as the ignition is turned on. When I put a jumper across > > it the relay energized (I heard it click) and the blower worked > > properly. > > > > Anyone know why this fuse would keep blowing out? > > Fuses blow to prevent the wires from melting and catching fire. > > So, that means something down the line is pulling way too much > current. That can be a motor that has shorted windings. Motors > that fail this way still work but they draw a lot of current. > > Disconnect the motor, put in a new fuse, and try again. If it > doesn't blow it's the motor. If it blows then I dunno, need a > schematic to help you any further. > > -- > DougW |
#8
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DougW wrote: > did pass the time by typing: > > wrote: > >> L.W. Hughes III (=DFill) wrote: > >>> http://www.billhughes.com/blower.pdf > >> > > I'm getting closer to getting this thing fixed. > > > > The blower itself works fine if I put a jumper across the main relay > > cavities. The relay itself tests out OK. > > > > I found a blown 15A fuse, #25, in the fuse block. I replaced it but it > > blows as soon as the ignition is turned on. When I put a jumper across > > it the relay energized (I heard it click) and the blower worked > > properly. > > > > Anyone know why this fuse would keep blowing out? > > Fuses blow to prevent the wires from melting and catching fire. OK, OK, my question was a little too general > > So, that means something down the line is pulling way too much > current. That can be a motor that has shorted windings. Motors > that fail this way still work but they draw a lot of current. > > Disconnect the motor, put in a new fuse, and try again. If it > doesn't blow it's the motor. If it blows then I dunno, need a > schematic to help you any further. > I just went out and pulled the relay which disconnects the motor as there is now an open circuit to it. The fuse still blew, instantly - at lest before I could get the meter on it - once I turned on the ignition. -- Thanks, Aaron |
#9
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a short what is the position number for the fuse
wrote: > wrote: > > L.W. Hughes III (ßill) wrote: > > > http://www.billhughes.com/blower.pdf > > > I'm getting closer to getting this thing fixed. > > The blower itself works fine if I put a jumper across the main relay > cavities. The relay itself tests out OK. > > I found a blown 15A fuse, #25, in the fuse block. I replaced it but it > blows as soon as the ignition is turned on. When I put a jumper across > it the relay energized (I heard it click) and the blower worked > properly. > > Anyone know why this fuse would keep blowing out? > > Thanks, > > Aaron |
#10
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tim bur wrote: > a short what is the position number for the fuse > #25, right above the two airbag fuses (only 2 that are labeled - Yes, I know there should be a label on the panel cover but there is not). Thanks, Aaron |
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