I can supply you with a schematic if you want? i would like the schematics
my hubbys car the defrost and the heat doesnt work. it stopped working then couple days later came back on. now it just wont come on at all now
a friend made the suggestion of it being the motor. my mom suggested a fuse. so any help would be greatful. thz in advance
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I first thought it was a common fuse relay that fed both those circuits but after looking at the schematics they are separate 20A fused window and 30A fused blower motor fed through a resistor pack. There is a separate 10A fuse that does illumination of heat selector speeds.
Can't supply a diagram, but the circuit works as follows: Power for the defrost grid is obtained through 30A fuse 22 in the battery junction box (BJB) and is applied to terminal 30 of the rear window defrost relay. Power for the relay is obtained through 5A fuse 22 in the CJB and applied to terminal 2 of the rear window defrost switch. When the switch is operated, power is applied to the coil of the rear window defrost relay, causing contact closure and heating of the grid. There is no timeout circuit shown so apparently power is applied to the grid whenever the car is running.
I found a the main ground wire opened from the blower motor and have temporarily tapped into and ran the same size gauge wire to known chase ground to quickly get running... (Florida-heat) Of course this is set to Hi position. I will need a schematic to complete trouble-shooting. Suspect open ground circuit back to motor switch?
blower motor is located right side of dash behind plenum.remove cover under right side of dash (2-3 screws) then unplug blowermotor, remove screws holding it and bingo blower comes out. may have to pull carpet back a little for more room and to remove blower it easy to do, good luck and hope this is helpful.
Ok, first off, check the fuses under the dash. If they're all good, does the blower work only on high speed? If yes, then you have a bad blower motor resistor, which is located under the hood, near the blower motor itself. If the motor doesnt work at all at any fan speed, make sure the wiring harness that plugs into the motor under the hood is clean and tightly installed. If it still doesnt operate, sometimes tapping on the blower motor housing will kick it on, but if that doesnt work, you may have to replace the blower motor. They are available aftermarket, and arent usually too expensive.
Fuse will be under dash drivers side. it's easy to check power at motor with a vom just remove the single wire from blower and attach positive to that wire and negative to a good ground. turn key on and check reading with switch in all positions. If nothing probably a fuse are the resisters in the duck forward of the blower that controls speed. If you have power to blower, then of course bad blower and maybe so anyway if it blew the fuse. It may be fixing to quit. I can supply you with a schematic if you want?