DCCV Brand Matters?

[nghtshd88]

My LS no longer blows any heat unless I crank it to 90, even at 85 its still cold. Same thing with the AC, it will not blow cold unless I set it to 60. Both sides blow equally though. Would leave me to believe the DCCV is bad.

Is it necessary to get motorcraft, or are other brands sufficient and even used ones?

 

[joegr]

Do I understand this correctly:

You set the control to 90 and you get heat.
Is it good heat output?

You set the control to 60 and you get cold air.
Is it good cooling?

What do you get at other temperature settings?

I suspect the interior temperature sensor or the discharge air temperature sensors are more likely to be your problem.

 

[nghtshd88]

I will not get pure heat unless it is at 90 and 90 only. Same with the AC at 60, not cold until I set it to 60. Other settings are basically one temp not hot nor cold.

 

[joegr]

I will not get pure heat unless it is at 90 and 90 only. Same with the AC at 60, not cold until I set it to 60. Other settings are basically one temp not hot nor cold.

Sounds like temperature sensors to me.

 

[nghtshd88]

Sigh.. Where are these located?

 

[joegr]

Sigh.. Where are these located?

Under/behind the dash, near the center, somewhere...

Air temperature sensor:
http://deneau.info/ls/s6x~us~en~file=s6xc1022.htm~gen~ref.htm

Discharge temperature sensors:
Found on another site: The passenger air discharge temp sensor is located in the center plenum. To get to it you need to remove the passenger footwell trim piece which is held in place with two plastic push rivets. Then remove the one 8mm (IIRC) bolt to drop the floor vent. With that removed, stick your head under the dash and look to the center plenum area behind the radio and HVAC controls. The temp sensor will be an off-white color rectangular piece (all that's visible) with a two wire connector plugged in to the top of it. With a small, long flat pocket screwdriver, unplug the wiring then pry the side nearest the radio/HVAC controls away from the plenum. It will pop out slightly, at which time you can reach in and wiggle the sensor out usings a side-to-side motion. Do not twist/rotate the sensor.

There will be two more sensors just like it on the driver's side mounted in the plenum. Access and remove them in a similar fashion.
I think that the third sensor he is talking about is the evaporator temperature sensor. It shouldn't be your problem since it should only effect cooling and would stop it at any temperature setting.

 

[nghtshd88]

That says there is one for each side basically.

Not sure if the discharge temperature sensors are really the problem then because both sides are behaving exactly the same. That would mean ironically both discharge sensors decided to break at the exact same moment. I guess its either the temperature sensor, where ever that is or the dccv not opening until the extreme.

 

[joegr]

That says there is one for each side basically.

Not sure if the temperature sensors are really the problem then because both sides are behaving exactly the same. That would mean ironically both sensors decided to brake at the exact same moment.

It could be the DATC itself, or it could be the driver's side sensor. The drivers' side gets priority if the two indicate very different temperatures. A good scan tool can display the sensor readings in real time and make it easy to tell.

 

[nghtshd88]

Where is the 3rd sensor you mention? Not the evap sensor.

 

[joegr]

Where is the 3rd sensor you mention? Not the evap sensor.

Air temperature sensor:
http://deneau.info/ls/s6x~us~en~file=s6xc1022.htm~gen~ref.htm