Lincoln ls cold air on drivers WARM on passenger

[dylanw94]

Hi. the title says it. Its not hot airjust warm. But after drivin 20 miles the air wuth finally be col. Whats going on?

 

[LS4me]

Hi. the title says it. Its not hot airjust warm. But after drivin 20 miles the air wuth finally be col. Whats going on?

Did you search at all? There must be a hundred threads on the DCCV (hint, hint) and it's symptoms when failing.

 

[dylanw94]

Uhm yeah. None of them say anything about it getting better as you drive awhile.

 

[marcredd]

Change the DCCV, bleed the system according to the manufacturer's guidelines and report back if the symptoms persist.

As long as the system gets bled properly, your issue should be remedied.

 

[dylanw94]

Alright. Thanks. I will buy the part tomorrow and try to maker progress on this

 

[joegr]

I'll go against the flow here. It sounds more like your R-134a (refrigerant) is low than your DCCV failing.

The key points are: (1) gets better while driving, and (2) passenger side warm but not hot.

 

[Telco]

I'll go against the flow here. It sounds more like your R-134a (refrigerant) is low than your DCCV failing.

The key points are: (1) gets better while driving, and (2) passenger side warm but not hot.

I would think that an R134a problem would hit the entire system, not just one side. Can you explain how this would be a refrigerant issue?

 

[joegr]

I would think that an R134a problem would hit the entire system, not just one side. Can you explain how this would be a refrigerant issue?

Due to the design of the evaporator and the thermal expansion valve, when the refrigerant level gets low, the cooling stops at the far side (passenger side) of the evaporator. As the level goes down, eventually, there will be no cooling at the driver's side either.

 

[marcredd]

Good info. So in your opinion if the refrigerant is not the culprit, the dccv is next in line as the root cause?

 

[G-RELL]

... the dccv is next in line as the root cause?

or coils

 

[joegr]

Good info. So in your opinion if the refrigerant is not the culprit, the dccv is next in line as the root cause?

Yes, followed by temperature sensors, the DATC, wiring, bad expansion valve, bad compressor, ...

 

[Talbotway]

Joe, I love you man! (and not in a homo kinda way) I gotta think that any prob my 04 would throw my way would have been diagnosed and solved here first! Thanks

 

[marcredd]

Joe, one more question now that I am thinking. Would the possibility of low refrigerant perhaps indicate a small leak? Maybe an o ring? I ask because my system worked fine for the 6 years I have owned the car(until the issue we discussed via pm) and never needed any refrigerant added. It simply worked year after year.

 

[joegr]

Joe, one more question now that I am thinking. Would the possibility of low refrigerant perhaps indicate a small leak? Maybe an o ring? I ask because my system worked fine for the 6 years I have owned the car(until the issue we discussed via pm) and never needed any refrigerant added. It simply worked year after year.

Yes, it would normally, but not always, indicate a leak. Some R-134a will out gas through the hoses all the time. The out gas rate should be low enough that you shouldn't have to top it off for about five years.
Generally, you will be over a can low before you notice that it is not cooling as well as it should.

 

[marcredd]

Lesson learned today. Thanks.

 

[Telco]

Due to the design of the evaporator and the thermal expansion valve, when the refrigerant level gets low, the cooling stops at the far side (passenger side) of the evaporator. As the level goes down, eventually, there will be no cooling at the driver's side either.

Weird. Thanks.

 

[dylanw94]

i did find out what was wrong today with my car. it turned out unfortunately to be a combination of several things. first the hydraulic fan is going out so that explains why it doesnt start to cool until driving fast, then the dccv fixed the problem with warm air on the passenger andddd it was a tad low on refrigerant.

 

[marcredd]

That is quite the combination. But glad your issue is resolved.

 

[Hawk03]

i did find out what was wrong today with my car. it turned out unfortunately to be a combination of several things. first the hydraulic fan is going out so that explains why it doesnt start to cool until driving fast, then the dccv fixed the problem with warm air on the passenger andddd it was a tad low on refrigerant.

Is it the fan or the fan actuator?

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