Front A/C issue

[04denaliXL]

I Have an 04 Yukon XL with a 5.3L. The front A/C only gets cold after driving, but when you aren't moving it gets really warm. The rear A/C blows super cold non stop though. I've verified the blend doors work properly and the R-134a has proper pressure. Is there a solenoid or some kind of valve that seperates the systems that could be faulty? What could be wrong that would let one system work great, but not the other?

 

[doylee4693]

I Have an 04 Yukon XL with a 5.3L. The front A/C only gets cold after driving, but when you aren't moving it gets really warm. The rear A/C blows super cold non stop though. I've verified the blend doors work properly and the R-134a has proper pressure. Is there a solenoid or some kind of valve that seperates the systems that could be faulty? What could be wrong that would let one system work great, but not the other?

I found out today that im having the same issue!

 

[04denaliXL]

Let me know if you find out what it is. I figure it can't be the compressor, since the rear works so well...but idk. A/C systems have never been my area lol

 

[ForgottenKnight03]

You sir, need the efan swap!

 

[04denaliXL]

You sir, need the efan swap!

Really? So with age does the standard fan just no longer work to cool condenser? Even a new fan clutch wouldn't help? That sucks. Should've kept the higher mileage Denali that had no issues, but stepper motors...lol

 

[ForgottenKnight03]

lol, Im no expert... But AC performance on those hot days was one of the greatest advantages of my efan mod.

 

[04denaliXL]

If it'll help, I'm down... I just want to get technical evidence it'll work before I go through all the trouble. Especially since the rear keeps blowing hella cold. Too bad it's not easy to test first without spending the time and money.

Thanks!

 

[dropmech]

Your evap could need replacing. It happened to another car of mine and I ended up needing a system charge and new evap.

 

[04denaliXL]

I was thinking about having the system evacuated and recharged to see if that helps. I really don't wanna deal with changing the evap right now, it's almost winter...I'll wait till next summer if it comes to that.

 

[Poppy's Denali]

Sorry to bump such an old post, but being it's getting warm out there I'm sure I'm not the only one with this issue. I have having the exact same issue ad the OP. The front blows colder when driving but gets warmer when at idle. The rear is ice cold all the time. Any suggestions?

This is an 06 Denali XL BTW.

 

[01Konvict]

I would guess the 06 denali has electric fans and that the fan for the AC isnt working. I did the efan swap and my AC fan relay was bad. Replaced the relay and fan worked then AC started cooling. I would start with that symptom first then look into AC parts.

 

[angrysam]

Just for something cheap to try-

Hose off your radiator and condensor fins. Hose out between them too. It's good maintenance anyway.

The condensor relies on airflow through its fins to cool properly just like a radiator does. If airflow is reduced by crud then it can't work.

 

[anguyen325]

have the system evacuated and check to see if the orifice tube is clogged up

 

[Poppy's Denali]

I did a search before I resurrected the thread and saw this efan, but have no clue what it is. My next course of action is to hose out the cooler, rad, and condenser as I do know that can inhibit the A/C, but are there 2 condensers on a dual zone equipped vehicle? I know there's only one compressor so...

And the secondary fan kicks on as expected.

 

[anguyen325]

There's only one condenser but 2 evaporator cores