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#1
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1997 cherokee heater fan blowing fuses
It happens at random times, with no obvious cause, I have changed the
resistor pack but to no avail. Is there a relay in this circuit? My next option would seem to be to remove the dash to get to the fan unit. |
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#2
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1997 cherokee heater fan blowing fuses
The fan is under the hood. You can check it's draw there.
There is a relay for the high speed. Did you already smoke out the resistor pack? The switch contact is also suspect for a melt and bad connection causing heat and caused by heat that can melt fuses out. I believe the rear window defroster is on the same fuse in our Cherokee. That has caused strange fuse blows in ours. 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! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) big AL wrote: > > It happens at random times, with no obvious cause, I have changed the > resistor pack but to no avail. Is there a relay in this circuit? > My next option would seem to be to remove the dash to get to the fan > unit. |
#3
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1997 cherokee heater fan blowing fuses
don't understand what you mean "smoke out", (I'm English), but I have
put in a new resistor pack, so I can rule that out. I bought a service manual cd but have just found that although my Jeep was registered 1/1/1997, it is actually a 1996 model so the cd is useless, I need to get the info for a 1996 model now. :-( |
#4
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1997 cherokee heater fan blowing fuses
When the heater switch or resistor pack blows from too much power draw
on a flaky connection, they can literally 'smoke out'. When the switch went in our Cherokee, we were way out in the Canadian bush and it sure let the smoke out. I was running for a fire extinguisher because it looked like the whole dash might go up in flames. It still didn't blow the 25A fuse..... The resistor pack failure is an 'effect', not a cause of trouble normally. Normally when the resistor pack fails, the heater motor is on it's way out. I would be suspecting your heater motor is drawing too much power. Does it make any odd noises? 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! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) big AL wrote: > > don't understand what you mean "smoke out", (I'm English), but I have > put in a new resistor pack, so I can rule that out. I bought a service > manual cd but have just found that although my Jeep was registered > 1/1/1997, it is actually a 1996 model so the cd is useless, I need to > get the info for a 1996 model now. > :-( |
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