Climate control fans not working - JeepForum.com
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post #1 of 20 Old 03-15-2020, 08:56 AM Thread Starter
tjx0116
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Climate control fans not working

I've got a '98 Jeep Grand Cherokee 5.9 Limited. In turning on the heat the other day, no air came through the vents.

I hear the mechanism in the back making a noise when I change the location of the air flow, but no air comes through (no matter the setting combinations). I do notice that when I am driving fast, the fan speed is on "Hi", and the climate control unit is set to ventilation as opposed to "recirc", a very small amount of air can be felt through the vents.

Does anyone know what could be the issue here? Do I need to replace the climate control unit? Thanks!

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post #2 of 20 Old 03-29-2020, 02:01 PM
97ComptonZJ
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It’s most likely your blower motor resistor up underneath the passengers side dash! Mine is doing the same thing and if you have automatic climate control then be prepared to pay well over $100 for the resistor! If you have manual climate control then the part is only about $8!
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post #3 of 20 Old 03-31-2020, 11:02 AM Thread Starter
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Originally Posted by 97ComptonZJ View Post
It’s most likely your blower motor resistor up underneath the passengers side dash! Mine is doing the same thing and if you have automatic climate control then be prepared to pay well over $100 for the resistor! If you have manual climate control then the part is only about $8!
Thanks a lot for your suggestion! I'm going to try to get out there today, remove the resistor, and test it with a multi-meter. I'll let you know what I find.
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post #4 of 20 Old 03-31-2020, 12:34 PM
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first which system look diagrams below?
that will aid in resistor selection.

Check PDC fuse #7 a 40amp, one of the big ugly ones.
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When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #5 of 20 Old 04-01-2020, 05:08 AM Thread Starter
tjx0116
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Originally Posted by jtec View Post
first which system look diagrams below?
that will aid in resistor selection.

Check PDC fuse #7 a 40amp, one of the big ugly ones.
In your diagram, my Jeep has the bottom system.

If it was a fuse, wouldn't the entire climate control system not work?
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post #6 of 20 Old 04-01-2020, 05:49 AM
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NO

wouldn't it have been easier faster to check fuse than type a question?

Let me get the diagram again.... knowing which controller helps selecting diagram
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When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #7 of 20 Old 04-01-2020, 06:07 AM
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no speed control and no HIGH blower speed?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #8 of 20 Old 04-01-2020, 07:34 AM Thread Starter
tjx0116
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no speed control and no HIGH blower speed?
No matter what speed the blower is set to, no air comes through the vents.
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post #9 of 20 Old 04-01-2020, 11:06 AM
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first how did that fuse check out?

Next do you have and Can you use a DVOM, test light and wiring diagrams?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #10 of 20 Old 04-01-2020, 02:13 PM Thread Starter
tjx0116
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first how did that fuse check out?
Would fuse #7 be "40A BLOWER MOTOR"?
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post #11 of 20 Old 04-02-2020, 08:21 AM
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See attachment -
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When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #12 of 20 Old 04-03-2020, 08:32 AM Thread Starter
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Originally Posted by jtec View Post
See attachment -
Thanks for the diagram! The fuse looks good to me -- see for yourself:





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post #13 of 20 Old 04-03-2020, 03:07 PM
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attachment
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File Type: pdf 98ZJ ATC.pdf (50.7 KB, 4 views)

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #14 of 20 Old 04-04-2020, 06:02 PM
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Why don't you.make a jumper and power on the blower to see if it works or not.

98 5.9
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post #15 of 20 Old 04-07-2020, 09:35 AM Thread Starter
tjx0116
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Originally Posted by jcjunkie View Post
Why don't you.make a jumper and power on the blower to see if it works or not.
How would I do that?

Also, would a multi-meter help in determining if the blower resistor isn't working?
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