2000 Jeep Grand Cherokee Logo
Larry Snyder Posted on Mar 04, 2015
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The heater blower motor runs the starts running again then stops then finaly runs ok but it finaly gave up checked all fuses wire termals for being melted looked at ristor looks fine ihave 12volts at blower motor on both wires ran aux wires from another battery work fine that way

2 Answers

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  • Jeep Master 20,706 Answers
  • Posted on Mar 04, 2015
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Sure switch.
ok great job BTW. hot wiring motor. you did 2 tests, need 3.
motor works, but one side is not grounded.
so that means bad controls
there are 2 HVAC systems. one is called manual
other is Climate controls or some name......???
so i cant see what you have.

what you have is this.
the TIPM sends 12v to the blower.
on high the resistor block is byassed, so forget that.
the blower is grounded via
heater AC controller model.
at pin c2 - pin1 db/yl
same controller pin C1-pin9 gets a ground from the cluster brain.
at C4 pin 4 of brain CCN.
if that pin is 0v
and the C2-pin12 is 12v then the switch in the controller is bad.

gbob59

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  • Jeep Master 3,063 Answers
  • Posted on Mar 04, 2015
gbob59
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No Power to Heater

by heater i take it you mean the blower motor.these work on a fuse and or relay and a set of resistors.but start by checking the fuse as you said you have no poower.if the fuse is ok then check for power at the plug on the blower motor, you will have to disconnect the plug at the blower motor and have a tester placed on 12 volts to perform this test.turn ignition to the on position and turn on the heater unit,you should have a reading of some kind .if you have up to 12 volts then the wiring and fuseare ok. the problem then would be the blower motorbut after removal you could always check the motor by hooking it up to a 12 volt power source to see if it turns.
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Does the heater blower run off a fuse and if so where's it located?

yes these run off of a fuse in the fuse block located under the dash to the left of the steering colume.use a test light to check all fuses.also if the fuse is good try tapping the motor itself it may start if so the blower motor needs replacing.or you can run a power wire to the terminal and ground wire it should run.again if not the motor is no good if it does then you could have a problem with the blower motor resister being bad.
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The heater fan just stopped...

Check fuse #14(10amp) located in fuse box under driver steering wheel behind the lower dash cover.
Check fuse#12(40amp) located in fuse box under hood.
Replace fuse(s) if any are blow.

If fuse are good.Check blower and transisto next.
Do steps 1-3 with turn key on
1. Unplug connector and check for 12v at the blue/white wire at the blower motor(2-NAT)
-if there's no voltage you might have a bad relay or open in the wire
-if there's about 12v, go to step 2
2.Plug connector for blower motor and unplug connector for blower transistor(4-NAT). Take a jumper wire and jump the blue/black wire to body ground.
-if blower does not run, replace blower motor
-if blower motor runs, go to step 3
3.check the black wire at(4-NAT) for good ground.
-if you have good ground, then replace blower motor transistor.
good luck

k42282_34.jpg
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The blower motor stopped working, so I replaced the 30A heater fuse which was blown. Tried the blower again, and the fuse blows within a minute. Now when I try to replace the fuse with the battery...

disconnect the blower motor. if the fuse is ok then, the blower motor is bad. if the coolant leak is on the passenger floor, you may have a heater core leaking, although you may also smell a sweet odor from it.
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My heat has stop blowing. replaced blower, and heater on off switch. what else could it be?

LX? DX? EX? Hatchback? sedan? wagon?coupe? engine size? did you check the fuse? Fuse #19, 30 amps in the auxilary fuse box (your owners manual may show the location ,it may be near the blower ?). The Blue/White wire at the heater blower motor should be HOT (12v) with key on. If you ground the Blue/Black wire the motor should run full speed.
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sounds like you my need a blower motor
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Heater works, not blower.

Chech the blower motor to see if its working. Unplug the wire harnes and run a jumper wire to the blower motor. you will need two wires, one hot, one negitave. Put the + on on termal and the - on the other termal. make sure the wires do not touch each other and see if the fan motor will turn. If not, the motor is bad and has to be replaced.
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