D2 s8 hvac always blowing hot

[replica_rs4]

Saved an s8 that was sitting for a longtime with a dead engine.
Got it up and running great. Hvas always blowing hot air .
Looking at hvac unit in center behind engine firewall found 2 unplugged connectors
One is 3 pin and other is 2 pin, what am I missing here ?
Had some codes that I erased and have not came back yet.
00734 g142
00729 g132
00731 g139

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[replica_rs4]

Got it figured out.
Car has cheap bypass. Missing item from picture .

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[ShelbyM3]

Got it figured out.
Car has cheap bypass. Missing item from picture .

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What is that thing?

I’m becoming a new owner of a D2 S8 and maybe we can bounce ideas and troubleshoot with each other, haha.


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[replica_rs4]

What is that thing?

I’m becoming a new owner of a D2 S8 and maybe we can bounce ideas and troubleshoot with each other, haha.


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Heater core flow valves , without it always hot and aux pump for keeping warm with engine off for up 30 min.
People using wrong antifreeze or shifty sealants make those units clog up and stop working. Previous owner thought it was good idea to delete it. Now I'm stuck sourcing all the missing hoses and pump , valves assembly .
Units are NLA and were around 1500$ usd to replace .
Sourced mine from wrecker in Europe.

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[ShelbyM3]

Heater core flow valves , without it always hot and aux pump for keeping warm with engine off for up 30 min.
People using wrong antifreeze or shifty sealants make those units clog up and stop working. Previous owner thought it was good idea to delete it. Now I'm stuck sourcing all the missing hoses and pump , valves assembly .
Units are NLA and were around 1500$ usd to replace .
Sourced mine from wrecker in Europe.

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Good to know. Thanks for the info! I’m trying to proactively learn about these things before she lands and before I have a bigger issue. So much of these D2’s and C5’s are becoming NLA. I’m all too familiar with my 3 C5 Allroads.


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