Ok, I know there is a ton of heater questions right now, but I have been trying to fix mine since I owned the Jeep and it is not core related.

***PLEASE READ AND COMMENT***

This is exactly what has happened:

The heater used to switch speeds and work on and off when it felt like it, usually after the engine ran for awhile, the air always being plenty warm, it is a electrical blower issue.

I replaced the resistor with one from the JY. It seemed to work for a bit, switching speeds, then not really again, then it was summer and I didn't concern it.

Now come this winter. With the Jeep running switching the heater on and off (not fan speed) I can hear hissing and a click (relay) at the passenger foot well, sometimes (this has always happened).... It has been working in low speed only when warmed up, sometimes on and off while driving, basically when it wants to again...

Today I tested voltages at the heater control and the resistor, this is what I have:

The 4 prong plug on the right of the heater control (for the ac/or different heat areas) has power on the 2 middle purple wires. With that plugged in the fan speed switch has power on one prong. At the heater resistor It has power always on one prong, then switches between 3 other as I change the fan speed switch.

This all sounds like the switch electronics are functionally properly yes?

I think I have a bad resistor from the JY, anyway to bypass and/or test it? I really dont want to buy a new one and not have it fix my heat, again.

PLEASE GIVE ME YOUR OPINIONS ON THIS?!?!
I have done all I can think of without aimlessly buying new and replacing parts not knowing if it will fix my problem...

I hope someone will genuinely try to help me, I have posted quite a bit of questions on this forum with them left unanswered. Like my questions about rugged ridge steering components or upgrading to GC parts...

This place is a wealth of knowledge and I have learned much, but not as support-full as I would like..

 

get a new resistor and blower motor if i under stand what you just said this should cure the prob

 

ok, but is there a way to test them....

I believe thats exactly what I said I didn't want to do, aimlessly buy parts...
The blower works sometimes...

someone else please chime in, I so rarely get comments on my questions, why....?

 

the resistor regulates the power gong to the blower motor you would most likely have to have a volt meter to see if the current changes at the terminals of the resistor ,the blower motor remove the plug and use jumpers to the plug

 

I have a voltmeter, I would have to check the voltages at the resistor with it plugged in right?

I just dont quite under stand how if there is 4 wires to the resistor, one always positive and the 1 of the other three gets turned on with different fan speeds, where are the wires to the blower? It seems like to be there should be another set of wires from the resistor to the blower, or maybe I dont understand....


Any more info on what plug, where, what wires to jumper on the blower?

 

passenger side fire wall at blower motor

 

guess i'll just have to get in there and figure it out, hope I dont blow nothing up.

 

ill get a pic hold on

 

it right here

 

thumbnail picture

I'm gonna go buy a new resistor for now

 

if the motor is blowing on any speed thats wear id start the only other thing in the related prob is the switch on the dash common problem the plug melts on the factory wire harness

 

the speed switch or the selector switch? neither are melted, ive swapped both and cleaned contacts, no changes.

I bought a new resistor today, $8.50 from my local parts warehouse. Didnt get it put in but will tomorrow and report back, thanks.

 

ok its tomorrow

 

Nope, new resistor didnt do a thing

So will you, or someone, please post a DIY for getting to the blower motor. First I would just like to get to the power plug for it. Is there only one connector on the motor? And what wires do what?

I'd like to measure how much volts and current there is at the motor connector as well as try to make it turn on with a fused wire straight from the battery.

Is the motor inside that plastic under the glove box next to the resistor or is it centered under the dash behind the shifter, like most cars are.

Please I am freezing!
Thanks

 

I am pretty sure you get to it from under the hood. There are just 3 or 4 bolts or screws holding it in.