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Ask Randall C Your Own Question
Randall C
Randall C, ASE Master Tech
Category: Jeep
Satisfied Customers: 12803
Experience:  ASE Master Tech, L1, Jeep owner, Shop owner
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Air works then stops later will work again have changed

Customer Question

air works then stops later will work again have changed lblower fan resister
JA: How long has this been an issue? How many miles are on the car?
Customer: a year or so 160000
JA: What is the model of your '158000 Jeep?
Customer: 2003 grand cherokee
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: yes changed fan resister
JA: Anything else you think the mechanic should know?
Customer: no
Submitted: 8 months ago.
Category: Jeep
Expert:  Randall C replied 8 months ago.

Hello, do you have the automatic or manual temp controls? also, what engine so I can pull correct diagrams

Customer: replied 8 months ago.
Expert:  Randall C replied 8 months ago.

I also need engine size I asked for, thanks

Customer: replied 8 months ago.
4.7 L
Expert:  Randall C replied 8 months ago.

Thanks, ***** ***** said its an auto system but changed resistor, The auto does not have a resistor, it has a blower control module. I just wanted to be 100% on same page. Thanks

Customer: replied 8 months ago.
4.7 liter
Expert:  Randall C replied 8 months ago.

Hello, are you receiving what I am asking? if not please let me know, thanks

Customer: replied 8 months ago.
it has a resister with a heat sink ahead of the blower motor
Customer: replied 8 months ago.
are you there
Expert:  Randall C replied 8 months ago.

Sorry, takes time to type etc ...ok, if you are sure you have the auto system, its not a resistor used, its called the blower control module , big difference. So.. with this said? being the auto system as you say,? you have one of 2 things, either the blower motor is failing ot the control panel is failing. You said you changed the resistor/ module so we can rule that out so next step? when the blower stops again? get the the blower, set speed on high, key on and hit hard on the blower in different spots. M,any times it will come back on indicating a blower that is going bad, we even do this in the shop to diagnose/ I highly suspect the blower is getting hot, cutting off as its going bad and you need a new blower. Worst case is the control panel which is not that common, I lean to the blower motor, here is the wiring diagram. it will not be a fuse since it comes and goes, a fuse? it wiould never work till fuse changed, Hit on the blower kind of hard in different spots next time it quits, but be sure key is on and blower on high