No Second Speed on Heater Fan - JeepForum.com

 
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post #1 of 4 Old 03-12-2011, 03:15 PM Thread Starter
BZman
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1999 XJ Cherokee 
 
Join Date: Mar 2011
Location: Madison
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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post #2 of 4 Old 03-12-2011, 03:39 PM
mortalenema
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1999 XJ Cherokee 
 
Join Date: Dec 2006
Location: Minneapolis
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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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post #3 of 4 Old 03-12-2011, 04:35 PM
mecompco
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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.
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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.
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post #4 of 4 Old 03-12-2011, 04:37 PM
tjwalker
It's the crank sensor!
 
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Join Date: Nov 2007
Location: Central Minnesota
Posts: 8,752
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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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