I have checked fuses and relays? and there was no problem
(the blower motor dose not run)
i have hooked up the blower motor to the battery and it turns on!!?
i have replaced the resitor.
i have replaced the control switch
i have a feeling its going to be a wireing problem
if theres anyone that has had this problem or might know what to do.. let me know
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Re: 2000 jeep cherokee NO HEAT?
Looks like you have replaced just about everything...But, don't forget that the mode selector is also a switch (vent, bi-level, defrost etc) If that switch is not connecting, nothing will work. Did you test the components you changed, or just changed them using the process of elimination method? Put a volt meter on this stuff and determine where power is stopping. Good luck
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It's amazing the car even runs. Reverse polarity on a car battery will usually fry the ECU, which is the computer that runs everything from the engine timing to smog control. Consider yourself lucky.
You must have had the Blower motor in the On position and tried to start the car after the battery hookup.
First start at the fuse for the Blower motor, which may be under the drivers side dash or in the engine compartment. (you did not specify the vehicle make)
If the fuse is OK, then the relay may be fried. relays are usually under the hood inside the big fuse/relay box. Look at the fuse/relay legend (map) inside the cover and locate the relay for the Blower motor. It may just have a 'fan blade' symbol. Exchange it for a relay of the same type and style in the same box. Put the 'new' relay in the blower motor socket. Turn the key to the 'On' position (just before 'Start') and test the blower motor. Turn the key off. If it worked, take the bad relay to a car parts store and buy a new one. It'll cost between $10 and $50. I know, doesn't seem worth it.
If that doesn't fix it, return the relays to their original position and go to the parts store and buy a repair manual for your year, make and model. Locate the section on Heat/AC and replace the Blower Motor Resistor. That's probably the culprit. Short of that, take it to the dealer or a good repair shop, that you trust. It can be an involved repair job.
Check for a blower relay/switch (black square in fuse panel under the hood). you can test the blower motor by running a jumpwire from the positive battery cable to the positive connector on the blower. if it doesn't run, replace the blower motor. If it runs, replace the switch or relay.
Check the blower motor fro good connection, power and ground. Hot wire it to the battery and see if it runs. Check the blower fuse, relay, switch and resistor pack. blower and rear defrost circuits are totally unrelated.
The answer is that there is dirt dust and fuzz built up in the brushes of the blower motor. Had to figure this one out myself. Remove glove box, carefully disassemble bottom of blower motor, remove brush cap and brushes clean up mess and reassemble. Not for a novice but if you're a thinker you can figure it out. Mine has worked every time since. The Pontiac guys had no clue wanted to replace motor.
If your saying the blower runs intermittently, I'd start testing at the blower motor when problem is ongoing, if good voltage and ground with no blower action, suspect the blower motor. Did you use a test light to check voltage at fuses, as you can see, one fuse goes hot with the key on, the other fuse is hot all the time. The top wire in diagram for blower motor is voltage, the bottom wire is ground.
Any motor that uses brushes and the brushes are worn badly, the motor may run intermittently.
Most likely the blower motor,it has gone out,some times,not always,you can bump the blower motor with your hand,and it will start to run,or it will try,if so,replace the blower motor,otherwise,check the voltage at the blower motor,if it has voltage,replace the blower motor,if it has no voltage at the blower motor,then replace the blower relay,located near the blower motor.