11 replies to this topic

[Dylan720]

Hi all I recently replaced my engine in my 2004 Subaru liberty it has the h6 3 litre in it it's running very well now I just have to replace my AC condenser as mine is buggered and then get the AC regased asbi also replaced my compressor during the engine swap. My issue I'm having at the moment is when I have my heater on the driver's side vents get warm but the passenger sides stey cold just wondering what are some things that can cause that issue ? If there's still any air in the cooling system can that cause it or would it be something else to look for ? Any help would be great thanks.

[Barbbachello]

Sounds more like a failed blend door or something in the fan box

[duncanm]

yeh - does air even come out of the passenger side vents?  Try flicking the mode (face/foot/screen etc) and note what happens.

 

Note that:

• All the hot/cold air comes from the same fan and box
• All the zone face/defrost/foot selection is common to both sides of the car

 

So its some problem with the distribution of that air afterwards - ducts and vents from the heater/ac box onwards.

 

Have you had the dash out? Did a duct get blocked or not hooked up properly? Is there a dead mouse or nest in the passenger side vent?

[Dylan720]

Air comes out of the passenger side vents both vents but it's cold air only no hot air comes out of them where as the driver's side vents get both cold and hot air depending on what temperature it's on

[allpaw4]

Definitely sounds like the zone motor has failed, or something is blocking it. Can you still switch between demist/feet/head?

[Dylan720]

Yeah all that works everything seems to work fine fan speed and all the different vents Feet face windscreen.

[allpaw4]

Not much you can really do besides either pull it to bits, run through the diagnostics section of the FSM, or start replacing bits. As Nick has said, possible failed blend motor, or one of the other various motorised doors in the system. Ive found the diagnostics part of the manuals pretty easy to pin point issues.

Is this a dual zone system or single zone? If its dual zone, imma put money on the passenger side blend motor.
Also, if you've replaced components with dual zone bits, that will do it, the single zone controller wont know what to do with the extra blend motor.

[Dylan720]

Not it is single Zoe unit and haven't replaced anything like that only the engine as it had a blown head gasket.

[Beckers]

Not it is single Zoe unit and haven't replaced anything like that only the engine as it had a blown head gasket.

It's very common on gen4 for these blend motors to fall.

As above check these for correct operation.

[duncanm]

ah - gen4 zones.. there you go.

[Dylan720]

Ok thanks where abouts is it located I've done a research online but can't seem to find much about it and is there a way to test them ?

[allpaw4]

Find a copy of the FSM and use that to fault find. Last gen3 one I got from Subaru was 78 bucks, was a PDF file on a CD, or you can find them on a few different places online if you search.

Cheers,
Ben