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Car Forum / Driving, Maintenance, Tuning / 4x4 Cars / March 20061997 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. 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/pictures.html?id=2115147590 (More Off Road album links at bottom of the view page) > 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. 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. :-( 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/pictures.html?id=2115147590 (More Off Road album links at bottom of the view page) > 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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