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Unread 11-25-2008, 10:45 PM   #1
Grenmar
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Heater/AC Won't Blow Air

I can feel heat/cold air coming from the vents but when I turn the selector to make the air blow nothing happens. I bought my 1998 Grand Cherokee Laredo used and I have no owners manual. I was hoping to check the fuse box under the hood but I can not for the life of me find a diagram online to figure out which fuse I need to check.

I am under the assumption that the blower is out and have absolutely no idea where to start to see if that is the problem and if so how to fix.

PLEASE HELP

I am in utah and it's VERY cold in the mornings and having to bundle up just to drive to work is getting annoying.

Thanks!

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Unread 11-26-2008, 07:32 AM   #2
4jeepers
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Before you start throwing parts at the a/c-heating controls, first check the short connector to the fan (Under dash) the connector may look burned and melted due to a power surge (amps). This is supposed to be a common problem. I know as this happened to me over the summer and it gets very
hot around here. Good Luck

Start at fuse box under the hood on Passenger side, The fan fuse and relay are located there!

Last edited by 4jeepers; 11-26-2008 at 07:36 AM.. Reason: I forgot to mention fuse location
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Unread 11-26-2008, 08:35 AM   #3
Grenmar
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Right they're under the hood, but which fuses are they? I don't have an owners manual and I can't find a diagram anywhere on line. I don't know which fuse to look at or if those fuses are even there.
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Unread 11-26-2008, 12:34 PM   #4
TonyVideo
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You need to go to the www.wjjeeps.com site for all the little information that you need.
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Unread 11-26-2008, 04:43 PM   #5
Grenmar
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Thanks for the help but that website is for 99's and newer and mine is a 98. I don't know if there's a difference in the power box diagram but i'll look to see if the fuses match. It mentions that the box is under the driver side...I need to know about the power box under the hood of my 98 zj. I appreciate all the help so far tho.
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Unread 11-26-2008, 05:43 PM   #6
Vestjam
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I may have missed it, but is the blower not even running or is the blower running, but no air is being moved...
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Unread 11-26-2008, 10:05 PM   #7
Grenmar
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No air is being moved. I've checked the fuses and they're ok. I really don't know much about cars I'm just trouble shooting at this point in time so I can start to learn. I can feel heat coming from the vents while I'm driving but there is no air flow other then that.
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Unread 11-27-2008, 08:57 PM   #8
Grenmar
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Bump For Justice
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Unread 11-28-2008, 03:06 PM   #9
4jeepers
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Quote:
Originally Posted by Grenmar View Post
Right they're under the hood, but which fuses are they? I don't have an owners manual and I can't find a diagram anywhere on line. I don't know which fuse to look at or if those fuses are even there.
Take OHM meter and start checking all of them (One at a time) When you get to one that reads "0" ohms, replace it.
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Unread 11-28-2008, 03:46 PM   #10
darkfour
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Just dug out my manual for 98 GC (I've got a 5.9 and its the factory owner's manual but it's not model specific just says 1998 Jeep GC on the cover) and it claims that the fuse panel is on the front passenger kick panel. I've looked on mine and it's not there. Anyway when you find it fuse 12 is for the Heater-Ventilation-A/C control and recirc motor. It says its a 10amp red fuse and may be partially hidden.

The Electrical Power Distribution center is in the engine compartment near the battery amd number 15 is the blower motor and high speed blower motor relay. This is a 40amp Orange fuse. That's about all the help I can be
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Unread 12-29-2008, 09:20 PM   #11
moparman7479
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Heater/AC wont blow air

I am having the same problem with my 98. Having a few other minor problems as well but living in New England this time of year heat is kind of high priority. I have checked the fuses both under hood and in fuse box. (my owners manual says my box is in the dash but it's actually in the passenger kick panel. I have tested my motor and it's good, I removed the resistor and used a continuity tester and have power all the way through it and I have power from the switch to the resistor and the motor itself. (5 wires from switch) 1 is a dark green heavy gauge thats a ground the other 4 go to the resistor. all I can think of is the switch in the dash or it's a vac leak somewhere. Other problems right now is the flipper glass doesn't open and i replaced the switch and the accutator, I think it might be a poor ground since i have power to the accutator. the light that illuminates the rear wiper switch doesn't work all the time but if i tap the switch it comes on (or goes off) not a high priority since the rear wiper works. I have a heater control switch on order should be in 12/30/08 hopefully that solves my heat problem if not I am going to the dealer or using a toggle switch and fuse and just run the blower on high.
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