Dual climate control blowing heat on AC (DCCV removal instructions in post #107)

[shorod]

If you send me a private message with an e-mail address for you I can send you some PDF's from the Factory Service Manual.

-Rod

[joegr]

Originally Posted by 34Ford

Holy smoke. I have a mess.

But after taking out the instrument cluster I can see two more flap motors behind some of the ducts that is impossible to get out of the way short of removing the entire dash.
Could they not be opening, or stuck and letting the air from the heater core enter and not the air from the ac core?

All in total I know of 3 of these motors on the drivers side and the one up way high on the passenger side with a long rod that I cant really see what it looks like. It works.
And the lower one on the drivers side works too.

If I only had some idea how all this looked exploded and the air flowed.

All of those motors/flaps control where the air goes and where it comes from. In all cases, the air always passes through the AC evaporator. If you have a gen I, then there is a bypass door to bypass flow through the heater core for maximum cooling. If your problem is that the heat never works on either side, then it could be this door. If your problem is that you have heating when you want cooling then your problem could only be:
1. The DCCV.
2. The DATC not powering and therefore closing the DCCV.
3. A temperature sensor fault.

You won't believe me, but you are wasting your time and money looking at the air doors.

[34Ford]

Originally Posted by joegr

You won't believe me, but you are wasting your time and money looking at the air doors.

Well see you probably know how the system is built and works.
I have nuten to look at, but to tear out and learn as I go.

Will look at the posts on this valve.
[EDIT] After reading earlier posts I will unplug it to see if it closes.

[joegr]

Originally Posted by 34Ford

Well see you probably know how the system is built and works.
I have nuten to look at, but to tear out and learn as I go.

Will look at the posts on this valve.
[EDIT] After reading earlier posts I will unplug it to see if it closes.

It opens (full heat) when you unplug it. It closes if you connect +12V and ground to each of the two solenoid coils (if it's working).

[34Ford]

I thought I read on a earlier post it was the opposite.
So it want do me any good to disconnect it.

I know, I will find a place to clamp off the hoses just to see. I bet that will stop that hot water.

[34Ford]

Well from what I see Amazon wants $135 for the DCCV unless someone knows of a better price. I figure if Im going to tear out the old one might as well have the new one here.

[shorod]

Joegr is right, when there is no voltage or the DCCV is unplugged, the valves default to wide open if they are not stuck. So, if you problem is heat when their shouldn't be heat, clamping off the coolant lines won't tell you if the problem is due to valves that are stuck open, a DCCV that isn't working, or no signal from the DATC to close the valves. Changing out the DCCV without diagnosing it could cost you a lot of money and a headache at the same time, without actually fixing anything.

-Rod

[34Ford]

I went ahead and ordered one last night. I figured if Im gonna tear into looking at the old one I just as well replace it while Im at it.

[joegr]

There's a three-pin connector to the DCCV, at the DCCV. Find it. With the connector still plugged in, measure the voltage between the center pin and one of the outer pins. Do this with the engine running and the climate control set to 60 degrees. You should get close to 13V. Now measure from the center pin to the other outer pin. You should get the same voltage. If you do, and you are getting hot air out (not just uncooled air), then you have a bad DCCV. If either voltage is zero or very low, then you have a bad DATC, wiring, or temperature sensors.

[shorod]

On my wife's 2002 LS V6 there was another DCCV connector located on the passenger side top end of the radiator which made it very easy to get to the connector to perform the measurements suggested above.

-Rod

[34Ford]

Well.......finally. It appears the new dccv fixed it.

And for those who dont have a clue what it looks like.
A pic of the new one. The old one with hoses, and a idea where this bastard is located.

[rollyg]

Help! Its hot... I have an 03 ls v6. Blowing heat on a/c. Read some posts and did some poking around under the hood. I was gonna diconnect and reconnect the dccv from the plug that's pinned between the fan and dryer but the blck/orange wire snapped too close to the connection to just retape it. It snapped pretty easily so i hope its just a corroded wire. Anywho... I held the snapped wire together while my friend got the dtc 12 42... I know I need to fix the pigtail before anything else but any help with the code after I fix the wire.

[joegr]

Originally Posted by rollyg

Help! Its hot... I have an 03 ls v6. Blowing heat on a/c. Read some posts and did some poking around under the hood. I was gonna diconnect and reconnect the dccv from the plug that's pinned between the fan and dryer but the blck/orange wire snapped too close to the connection to just retape it. It snapped pretty easily so i hope its just a corroded wire. Anywho... I held the snapped wire together while my friend got the dtc 12 42... I know I need to fix the pigtail before anything else but any help with the code after I fix the wire.

B1242 1242 Air Inlet Door Actuator Circuit Failure
http://deneau.info/ls/s6x~us~en~file...~ref.htm#PS2-C

I would correct the DCCV problem first. I have scanned a few LSes with failing DCCVs and one of them had a 1242 code too. The 1242 code went away after the DCCV was replaced. Maybe the short circuit in the DCCV was overloading the DATC. In any event, the air inlet door wouldn't have much effect on the outlet air temperature.

[rollyg]

Thanks a lot 34ford. Not just for the advice but for replying so quickly. I replaced the dccv and problem solved.

[joegr]

Originally Posted by rollyg

Thanks a lot 34ford. Not just for the advice but for replying so quickly. I replaced the dccv and problem solved.

You're welcome shorod.