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Unread 03-12-2011, 04:15 PM   #1
BZman
Registered User
1999 XJ Cherokee 
 
Join Date: Mar 2011
Location: Madison, WI
Posts: 3
No Second Speed on Heater Fan

Hi Everyone,

I just joined the forum and hope I can get some help.

I've got a 99 cherokee 4x4 4 liter completely stock. The problem is that I lost the second speed on my heater fan. That seems to be the only speed that is gone. When it is on the first speed I can't hear it running, but I can feel a little heat comming out and 3 and 4 work fine.

So my question is, do you think it is the resistor or the fan switch that is bad.

Thanks for your help.

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Unread 03-12-2011, 04:39 PM   #2
mortalenema
Registered User
1999 XJ Cherokee 
 
Join Date: Dec 2006
Location: Minneapolis
Posts: 1,353
I vote for the resistor being bad?

Did you read this?
http://www.jeepforum.com/forum/f11/f...gh-wtf-656659/

KICK COVER
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Loosen the two screws that secure the upper
half of the kick cover to the heater-A/C housing
under the passenger side end of the instrument panel
(Fig. 52).
(3) Remove the two screws that secure the lower
half of the kick cover to the heater-A/C housing.
(4) Pull the kick cover down towards the floor
panel to disengage the slotted upper mounting tabs
from under the two loosened heater-A/C housing
screws.
(5) Remove the kick cover from the heater-A/C
housing.




BLOWER MOTOR RESISTOR
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the kick cover from the heater-A/C
housing. See Kick Cover in this group for the procedures.
(3) Pull out the lock on the blower motor resistor
wire harness connector to unlock the connector latch
(Fig. 18).
(4) Depress the latch on the blower motor resistor
wire harness connector and unplug the connector
from the resistor.
(5) Remove the two screws that secure the resistor
to the heater-A/C housing.
(6) Remove the resistor from the heater-A/C housing.
(7) Reverse the removal procedures to install.
Tighten the mounting screws to 2.2 Nm (20 in lbs.).
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Unread 03-12-2011, 05:35 PM   #3
mecompco
www.midcoastjeep.com
 
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1994 XJ Cherokee 
 
Join Date: Jul 2005
Location: Fairfield, Maine
Posts: 4,253
When the thermal fuse on the resistor pack goes you normally only get "high". I might suspect the dash controls.

Michael
__________________
'94 Cherokee Country
Engine: 4.0 HO, Sealed canister filter, 3 core CSF steel radiator, CatCo cat, Dynomax Turbo Flow muffler.
Electronics: Remote start/locks, Pioneer DEH-P7800MP w/XM, Polk Audio speakers, Garmin Nuvi 660 GPS, Cobra 148 GTL P&T w/Wilson 1000.
Suspension: Old Man Emu 3" lift+OME AAL, JKS adjustable trackbar, QDs, LCAs UCAs, A.C.O.S., DPG Offroad adjustable bumpstop plate, Daystar poly bumpstops.
Steering: Currie HD steering, C-ROK steering box reinforcement, OME stabilizer.
Armor/Recovery: T&T Custom belly skid, Mopar gas tank skid, JKS LCA mini skids, Rock Lizard Super Skink Sliders, Mopar 2" receiver, ARB Bull Bar/Ramsey REP 8.5 winch.
Drive train: D30 front axle w/Superior Chromo D30 axles & outter seals, D/S 4.56 R&P, ARB locker, Ruff Stuff cover. Ford 8.8 rear axle w/Superior Super 88 kit, Ford Motor Sports 4.56 R&P, ARB locker, SOLID cover, Russell stainless lines. Front and rear Tom Woods HD drive shafts, 242 x-fer case w/Tom Woods SYE.
Tires/Wheels: 33x10.5x15 BFG Mud Terrains on Alcoas.
Misc: Garvin Wilderness rack, Safari Snorkel, Redline Tuning hood lifts.
Awaiting installation: Autometer A pillar gauge pod, oil, water, & tranny temp guages, PIAA driving lights, Goferit tie-rod flip bushing, '95 Brake booster and M/C, M.O.R.E. Motor mounts, TnT Custom 1.5" Shackle.
Stroker Project: HO Block, '99 intake manifold, bored TB, 1" TB spacer, Dynomax Blackjack Header, Permacool electric fan.
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Unread 03-12-2011, 05:37 PM   #4
tjwalker
It's the crank sensor!
 
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1999 XJ Cherokee 
 
Join Date: Nov 2007
Location: Central Minnesota, MN
Posts: 8,513
Quote:
Originally Posted by mecompco View Post
When the thermal fuse on the resistor pack goes you normally only get "high". I might suspect the dash controls. Michael
I agree that the heater switch in the dash is the most suspect, if speeds 3-4 work.
__________________
99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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