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Old 01-31-2013, 08:34 PM   #1
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F 53 no chassis heater

I know that the heater motor works because I hot wired it.I have tested the circuit from the ign switch to the power distribution box where it goes thru 40 amp fuse and exits the box.According to the wiring diagram it goes to the battery junction box and goes thru a relay.I can't find the BJB or relay.Last week I got it working (no idea why)but it would not work after I shut off IGN switch. This circuit controls heat and air conditioning both. Any ideas? I should mention-2007 Fourwinds Windsport 36c
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Old 01-31-2013, 09:32 PM   #2
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Check the blower motor resistor?
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Old 01-31-2013, 09:44 PM   #3
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I found that and it appears to be fine.no power at the resistor. My problem is back up the line!!!
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Old 02-01-2013, 05:24 AM   #4
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You may already know this, but if not, your motor has to be running for the dash/chassis heater to actual heat, because that is where the heat is coming from. The reason I even bring this up is because you mentioned "hot wiring" the heater. Again not trying to be condescending, only trying to help.
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Old 02-01-2013, 05:59 AM   #5
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The 40 amp fuse feeds a bunch of stuff off an ignition relay and if that circuit was bad you would have more than just the blower motor not working. That fuse feeds a bunch of fuses in second fuse block under the dash normally near your left knee when sitting in the driver's seat. Can't remember what the fuse number is for the AC/Heat blower but from there it goes to the AC/Heat control panel in the dash. Since you had if working once check the fan speed switch in the dash for power in and out. Also check power out at all the various fan speeds.
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Old 02-01-2013, 08:30 PM   #6
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Problem solved !!! Cleaned the prongs on the #5 relay- problem solved thanx for the help-Iwill dance at yuor next wedding!!!
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