My car has been sitting for about four months. I started it up and found the AC select buttons not working and noticed the radiator fan ramps up to high speed. Blows hot air thru vents when driving down the road. Pulled codes and nothing found! Any suggestions? RCM or Climate control module?

What conditions would cause the radiator fan to ramp up?

Replaced RCM with spare, as M60A3Driver siuggested, but has same ramp up condition! What's a DUO Valve? Any suggestions wherte to go next? What does the fan control module look like and might it be the problem? Thanks

Found it and guess it's a mixing valve for climate control. Don't know if it would have anything to do with the radiator fans ramping up though. What ya think?

 

Hi, Turn the key to the on (right before it starts) and wait about 45 seconds. If the radiator fan ramps up really fast, most likely your RCM is bad.
If you have a spare, or can borrow an RCM swap it out and see if anything changes.
As far as the warm air, I'm having the a similar issue. I've replaced the blower resistor motor, no change. I did what DT Menace suggested: Turn on the car and roll up all the windows.
Set the heat as high as it can go and the fan to the top setting. Then get out of the car shut the door and let it run for 20 to 30 minutes. I did this but I haven't really driven it because it has snowed here and the roads are salted.
I'm also going to rebuild the "Duo Valve". If all else fails it might be a bad potentiometer in the climate control panel.
We'll have to see what happens. Good luck!

 

A bad Duo Valve, coolant flow, can cause this. It may need cleaning / rebuilding.

 

When I get a chance I'll switch out the RCM with a spare that I "think" is good. Have a few chores that need attention before I can get back on the troubleshooting!

CAR **** ALERT!!

 

Hello again! Been having som health issues since my last post in December. Maybe tomorrow I can get back to do some more troubleshooting. I have four cars and three are not running right now. My truck blew a radiator, which I've removed and have new one waiting for installation. My wife's KIA Sorento braking system has issues with related issue and won't start. My "06 Xfire is being used for the past three weeks and if it fails we will be using bicycles to get around! LoL. I've owned my "06 for about three years and wife has refused to ride in it "until now!" Guess she doesn't like walking! Ha Ha Ha! Well enough of this unrelated "pitty party" and I'll give an update on this '05 Xfire when I get a chance. The above suggestions are appreciated and will look into them. Thanks guys!

 

Glad to hear that you're back!

 

Thanks M60A3 Driver for your suggestions. Replaced my RCM with spare ane no difference.

 

[QUOTE=M60A3Driver;994891]Hi, Turn the key to the on (right before it starts) and wait about 45 seconds. If the radiator fan ramps up really fast, most likely your RCM is bad.

Thanks M60A3 Driver for your suggestions. Replaced my RCM with spare ane no difference.

 

The radiator fan is SIMPLE:

FOUND THIS QUOTE FROM PIZZAGUY, MAR 22/2014
The PTCM communicates it's desire for the fan to run over a single wire, bidirectional, Pulse Width Modulated data stream. When the PTCM wants the fan to run, it "tells" the Fan Control Module to speed it up. There is a two-way pulse sent back and forth, the PTCM 'pings' the FCM and the FCM pings back, indicating all is well.
If the communications break down between the FCM and the PTCM, two things happen:

1) The PTCM alerts you to a possible cooling system failure by turning on a small yellow indicator to the side of the instrument panel, it looks like a little radiator.
2) The FCM goes into "emergency mode" and spins the fan at high speed.

If you do NOT have the little light, my guess is that the FCM is bad. The modules run about $140 if I remember right.
If you DO have the light, you have a bad connection between the two modules or a broken wire.

The PTCM COULD be bad, but this would be a "first" that I've heard of in over four years on this forum. FCMs go bad kinda often.

PIZZAGUY: WHERE IS THIS LITTLE LIGHT YOU SPEAK OF? I'm guessing it's the radiator light on the dash panel! I just ordered the FCM cause my light does "not" turn on when fans ramp up high. ( Best hunch right now. )

 

A little additional info, "as I think I remember it," My AC Climate Control Panel" went dead and then the fans ramped up! Hope the new/used FCM I just ordered will correct all my problems!

 

I would trust pizzaguy's advice.
Just for the heck of it replace fuse #15 in the engine fuse box. You can also check to see if you're getting voltage on the center pin on the connector that goes to the duo valve.

 

Ok I'll give those two areas a try as well. Thinking of getting everything that needs attention fixed and selling this one. Just too much to keep up two XFires. Have new plugs, wires and coils to install as well.

BY THE WAY A "GREAT POST" OF YOURS ON "CLIMATE CONTROL REMOVAL AND INSTALLATION!" https://www.crossfireforum.org/forum...tml#post996771 THIS SHOULD BE A STICKY!
MAY HAVE TO BE DONE ON MINE AS WELL. ALL MY PROBLEMS WITH RADIATOR FANS AND CLIMATE CONTROL HAPPENED AT SAME INSTANCE.

 

I hope it works out for you. If there's anything else I can do to help, let me know. I'm not great with the electrical systems, but I'm learning.

 

DO YOU KNOW WHAT FUSE CONTROLS THE CLIMATE CONTROL POWER? The whole Climate Control Panel died at the same time and then the radiator fans ramped up after that. Fuse number 15 checked out good. Haven't checked DUO valve voltage yet.

 

Does anyone know where I can download a printable electrical schematic of the Climate Control Module and it's related sub-systems? I see where I can buy a complete electrical manual on USB from Ebad, but I usually get burnt from poor quality schmatics.


EUREAKA! I JUST FOUND A SITE WITH ALL THE SCHEMATICS AND DIAGRAMS FOR THE ENTIRE CROSSFIRE! YOU MIGHT WANT TO CHECK IT OUT AND BOOK MARK THIS LINK.

REPAIR & DIAGNOSIS
https://charm.li/Chrysler/2007/Cross...al%20Diagrams/

 

PER THE DIAGRAM, FUSES ( 15, 33, 35,36 & 37 ) ARE ALL RELATED TO THE HVAC SYSTEM. Gotta go check them out sometime today.

 

Oh heck, darn, poo poo and stinky! Replaced the fan control unit and same problem is still there. So where do i go from here? Maybe problem is caused by bad climate control unit???? WHO ELSE HAS HAD THIS SAME PROBLEM BEFORE AND WHAT WAS THE CORRECTIVE ACTION TAKEN? Does it have anything to do with that resistor in the Climate Control Unit that's discussed often? Come on Pizzaguy and M60A3driver you gotta know!
(Replaced RCM, Fan Control Unit and checked all the fuses.). Climate Control Unit no fan power and buttons dead!

 

When you say checked the fuses, did you use an ohm meter, or do a visual inspection?
I replaced all of my fuses, because I had 3 random fuses break over a couple of moths time. Two of the three looked good, but when I checked them with a meter they were bad.
I decided to replace all of them, even the spares. The fuses are cheap, they are ATC type fuses. @pizzaguy would know more about the schematics and wiring diagrams.
If you don't have a multi-meter, I would suggest getting one. This way you can check for voltage or resistance to find out what's working and what's not.
Example: You connect one lead to ground set the meter for Volts DC. Pull the fuses that you mentioned and check for voltage by using the probe to connect with the connection in the fuse box.
Write down any voltage found and where you found it. Then check it against the wiring diagram.
Then test the other side of the fuse box for resistance. First with the climate control set to off, you should have little or no resistance. Then switch the control on and see if it changes and you get resistance.
I guess that you've replaced the blower motor resistor as well? Also, when you turn the headlights on, does the climate unit light up, like if you were driving at night?
If it does, then you're getting power to the unit. If not, maybe the wiring harness got disconnected from the control unit.

 

Noooo! I will go back and re-check the fuses with a multimeter. Finding one that looked good but was bad would be a first for me but am sure it happens.

 

Let me know what you find out.