HVAC unit

4.2 V8 40v biturbo - 450 bhp
4.2 V8 40v biturbo - 480 bhp (plus)
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steve2003rs6
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HVAC unit

Post by steve2003rs6 » Fri Jul 04, 2025 1:08 pm

Hi all.
Did a scan today. Looks like the HVAC unit interior cooling fan has packed up.
Has anyone managed to gain access to the internals or are they a sealed unit.
Really don’t want to replace it for another used unit. As this one is in great condition. I replaced the buttons some years ago. TIA

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srichards
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Re: HVAC unit

Post by srichards » Fri Jul 04, 2025 1:42 pm

Isn't it the temp sensor / connection to temp sensor for the fan that has packed in not the fan itself? If it wasn't making any weird noises in the last weeks I'd think it could be that. Also with the pollution sensor also not working maybe it's locked out ventilation?

I'd check the fuses for it first in case it's died of old age or spite.
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steve2003rs6
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Re: HVAC unit

Post by steve2003rs6 » Fri Jul 04, 2025 2:07 pm

Hi Suz.
Every thing is working fine Suz. Air con ok fan blasting cool air out in this hot weather.

It’s the tiny fan inside the hvac unit for cooling the HVAC unit internal components. I did hear a slight squeaking noise some weeks ago. But it stopped.
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srichards
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Re: HVAC unit

Post by srichards » Fri Jul 04, 2025 2:43 pm

If you pop the ash tray open can you see up inside the HVAC front panel?
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steve2003rs6
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Re: HVAC unit

Post by steve2003rs6 » Fri Jul 04, 2025 3:11 pm

No. But just watched a total technic video on how to remove it.
Just remembered I have a spare hvac somewhere. I just need to find it. Bought that one for the buttons.
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srichards
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Re: HVAC unit

Post by srichards » Fri Jul 04, 2025 4:39 pm

steve2003rs6 wrote: ↑
Fri Jul 04, 2025 3:11 pm
Just remembered I have a spare hvac somewhere. I just need to find it. Bought that one for the buttons.
Seriously organised!
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steve2003rs6
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Re: HVAC unit

Post by steve2003rs6 » Sat Jul 05, 2025 11:34 am

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Hi Suz. In my toolbox of all places.
Front panel can be removed. The spare hvac unit is in better condition than I remembered. Just need to replace some buttons. That’s quick and easy with feeler gauges.

Topman (Craig) is checking the compatibility for me.
If that’s ok. I will do straight swop.

However might just strip the front cover off just for a look.

If you zoom in on the vent in the last photo. Top middle of the unit. You can see the small fan.
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Shoppinit
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Re: HVAC unit

Post by Shoppinit » Sun Jul 06, 2025 9:00 am

Can't you just swap the fan out?
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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Shoppinit
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Re: HVAC unit

Post by Shoppinit » Sun Jul 06, 2025 9:34 am

What makes you think this fan is internal to the climatronic unit? I'm not convinced it is.

/Looks like it probably is. I can't find a separate fan in the parts catalogue.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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steve2003rs6
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Re: HVAC unit

Post by steve2003rs6 » Sun Jul 06, 2025 10:32 am

Hi Ben
I googled error code 00796 v42.
Led me to the fan in the hvac unit.
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