2003 3.7L Liberty n00b.

[adamal]

What's up guys? I'm new to this forum, obviously :thumbsdown:. I joined because I'm having trouble with my mother's Jeep. Anyway, the problem is she gets heat only on the cold setting, and cold air on the heat setting :hmm:. I fixed a few vacuum leaks coming out of the plastic intake box, just before the throttle plate, but that really did nothing. I'm not sure how the heater core is controlled with Jeeps. I mostly work on, don't hate me for this,...Hondas... haha. Could you guys fill me in on this? Is the heater core controlled by a valve that controls coolant flow? Or is it something else? It'd be awesome if one of you had the same problem and could direct me straight to the problem. Anyway, good-day.

Thanks!
-Adam

 

[boebr1]

Get some red and some blue paint... repaint the blue part red, and the red part blue on the heat control so it works right...
I have no idea what's going on with that, hopefully someone here does. i'm guessing that it's something simple, something connected wrong

 

[adamal]

Haha. Yes, I'm assuming so as well. There hasn't been much work to it and it's been pretty well kept, so it can't be anything major. Do you know anything about how the heater core is control?

 

[JeepJeepster]

No valves on the heater core, coolant flows all the time through the heater core.

Blend doors are controlled by vacuum.

So its 100% hot on the cold setting? Or just warm? Nice and cold on the hot setting? or just cool?? No clue how those would become switched.

 

[adamal]

No valves on the heater core, coolant flows all the time through the heater core.

Blend doors are controlled by vacuum.

So its 100% hot on the cold setting? Or just warm? Nice and cold on the hot setting? or just cool?? No clue how those would become switched.

Yeah, 100% hot and very cold. I don't think the blend door for hot/cold is controlled by vacuum. I've just taken the control switch apart and it is connected to a circuit board. Unless, this circuit board just controls a different vacuum valve somewhere else:freak3:?Although, the blower vent placement settings (defrost, feet, etc.) are for sure controlled by vacuum.

 

[Nooby]

had that happen on my van, did you ever pull off the knob, and you put it on wrong?

 

[adamal]

Nope. Knob is on the correct way and can only go on the correct way.

 

[journeyjim]

I was under standing that the hot cold blend was electric door, and the vents were vacuum. I would check a FSM for sure.

 

[tjkj2002]

The Blend door(hot or cold selection) is controlled by a electric motor,the mode doors(where the air exits) are vacuum controlled in a KJ.

 

[adamal]

Thanks for the info, fellas. I realized that after I just ended up taking out the control switches. The switches work fine. Time to dig into the blend box/motor!

P.S. Do you gentlemen know if the motor controlling the heat/cold blend box uses a relay?

Thanks again, all of your help is greatly appreciated.

 

[Marlon_JB2]

We won't hate you for working on Hondas. Now had you said Toyotas, this would probably be an entirely different story.

 

[adamal]

We won't hate you for working on Hondas. Now had you said Toyotas, this would probably be an entirely different story.

DETROIT, What's up?

And yes, Toyota is the worst. Glad to see ya'll know what's up.