Question about 2000 Jeep Cherokee

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2000 jeep cherokee NO HEAT?

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
thanks

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You have a vaccume leak find it repair it and the blower will work again, i know this sounds strange but i had the same problem the entire system is vaccume operated

Posted on Feb 15, 2009

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  • Jeep Master
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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

Posted on Jan 29, 2009

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Posted on Jan 02, 2017

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2 Answers

I hooked the battery post up backwards an it caused all sorts of things to happen the one I need help with is when I go to turn on my heater/AC none of it works at all it don't blow or anything..


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.

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blower motor-oj0xa20ymx22hml3q4c1tsye-3-0.jpg

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The blower motor fuse,or relay is not working,check these,and the blower motor switch.The relay is activated by connecting ground to the relay.Best bet,is the blown fuse.

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