Question about 2003 Jeep Wrangler

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03 wrangler heater-A/C only blows on high.

Have replaced blower switch and relay (behind glovebox). Still only blows in high position. Switch shows ground with test light.

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  • 153 Answers

Check the blower motor resistor, I,m not sure where it is located on your vehicle most are on the firewall under the hood.

Posted on Nov 13, 2008

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Blower motor does not work replaced the blower motor, resister, fan switch and relay still does not work


blower , heater dead.?
use a voltmeter, and find out what is wrong, in minutes.
first check voltage to the blower,
on fan high.
got voltage there. then the blower is bad.
no voltage there, then its not the blower bad. its controls or power feed.
my guess is you dont know that fuses that look good can in fact be bad.?>
old post. but here goes.
of lost, use a schematic, they tell you how the circuit works.
click here
on TJ
then heater........
FSM
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

shows 7 things can be wrong. (omg what to do, use a meter)

now click A/C heater page.
same FSM.
got 12vdc to both JB fuse 8 and PDC fuse , keyon,
both sides of fuse must be 12vdc or the fuse is BAD.
got 12vdc to blower relay pin 1, (bad relay if not, or?)
if you have 12vdc on pin1 then then check voltage at
blower B wire,
if wires is at 12vdc that means the blower switch is bad.
if the wire to the switch C3 pin C is 12vdc that means the ground to the heater control is open. correct that
if the pin C3pin C is 0v, that is good, if switch is on high
and the C1 pin A is 12v, that means the switch is bad, or wires to it cut
or the connectors to IT are corroded.

just a $10 walfart DMM meter, and bam , why is know.
no guessing or pulling out hair.
as you can see the dash heater switch grounds the blower.
if it can not ground the motor, the motor will be dead.
that is how it works.

Feb 22, 2014 | 2000 Jeep Wrangler

1 Answer

Htg and a/c fan switch only works on high in 2004 GMC Envoy. The a/c and heat work, just the blower only blows on high


Sounds like the blower motor resistor module is bad. It is located behind the glovebox and mounted to the blower motor. Open the glovebox and in the back left corner find a spring, push on spring to release glovebox door completely. You should be able to see blower motor and resistor module.

May 13, 2011 | 2004 GMC Envoy

1 Answer

2006 chrysler pacifica air blinder not work only the vent for heating are blowing air i can't get it to switch to defrost or floor vent Could this have something to do with the blower relay switch...


the blower relay switch controls the blower motor,this sounds more like an air blend switch on the heater control head on the dash,not making the switch over in that switch.it could be the air blend door motor on the heater duct under the dash on the passenger side.this can be checked with a scan tool that has the capability to communicate with the bcm computer on this car.

Mar 17, 2011 | 2006 Chrysler Pacifica

2 Answers

Fan blower wouldnt work in 3rd position now wont blow at all


check blower risistoe on heater box,wiring also melts connector at resistor block

Aug 04, 2010 | 1999 Jeep Wrangler

2 Answers

2001 Jeep Wrangler heater blower stopped working


Yes I would go with the switch, BUT, does it have a resistor bank? That is, how does it reduce the speed? Many systems use resistors to lower the speed. Burnt or bad connections can cause this as well.
You can test the blower motor by connecting direct power from a source like the cigarette lighter if you are handy.
Most of the time the lower speeds konk out but the high speed continues to work this is the resistor bank that goes out.

Mar 25, 2010 | 2001 Jeep Wrangler

2 Answers

Blower motor for heater only works on high....what do you think I need to change. Relay or Resistor.


If the heater only works on the high setting, your problem is the heater fan resistor, not the relay.

Jan 07, 2010 | 2005 Jeep Wrangler

1 Answer

I'm looking too. I have a 1995 model.


There is a blower motor resistor that needs to be changed. You can get it at auto zone for around 25 bucks. I just changed one on my 03 tahoe.

Aug 08, 2009 | 1996 Oldsmobile Ninety Eight Regency

2 Answers

Heater blower switch only works on high


I'd replace blower resistor, usually found under hood on firewall on passenger side, or on duct work, inside under dash on passenger side,close to blower motor.

Jun 01, 2009 | 2004 Jeep Wrangler

2 Answers

Heater relay


First, turn on the fan motor to high, and then tap the bottom of the motor. The brushes stick to the armature, and tapping the motor will release them. Second, check for voltage at the connector for the motor. It should be 3 VDC at position 1, 6 VDC at position 2, 9 VDC at position 3, and 12 VDC at the highest position. No voltage at 1/2 & 3 = replace the heater resistor, located in the air box between the fan & the heater core. No voltage at all? Replace the fan switch.

Jun 07, 2008 | 1995 Toyota Pickup

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