CQ HVAC delete

General automotive discussion

CQ HVAC delete

Postby MikeB25 » Sun Sep 01, 2019 7:29 pm

I'm AAN swapping a '90 CQ and converting to primarily track use so I will be removing the A/C. If I remove this harness altogether (the bottom part):
https://audi.7zap.com/en/usa/audi+coupe ... 71-972065/
will there be any unintended consequences?

Secondly, I want to simplify the HVAC module as much as possible, starting with removing the evaporator, possibly even removing the automatic control. Has anybody ever adapted a different type of actuator to the various flapper doors on the HVAC module, like a stepper motor or simple electric actuator so I could get rid of most of the other harness?
'90 Coupe Quattro (AAN swap underway)
'93 UrS4 (organ donor)
'02 A4 1.8T Quattro (bone stock daily)
'08 Q7 (lemon)
'12 S4 (Stage 1...for now)
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Re: CQ HVAC delete

Postby alxdgr8 » Wed Sep 04, 2019 12:35 pm

How about removing all of the factory stuff and then running a universal heater box for defrost?
https://www.summitracing.com/parts/sum-991102-1/

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Re: CQ HVAC delete

Postby MikeB25 » Wed Sep 04, 2019 12:51 pm

I'm also considering that option. I'm not sure if it will fit as nicely as the factory unit but it looks pretty compact. I need to decide if I want to fabricate ducting or fabricate control cables/mounts.
'90 Coupe Quattro (AAN swap underway)
'93 UrS4 (organ donor)
'02 A4 1.8T Quattro (bone stock daily)
'08 Q7 (lemon)
'12 S4 (Stage 1...for now)
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Posts: 50
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Re: CQ HVAC delete

Postby Berserker » Wed Sep 04, 2019 1:51 pm

I've done what I think was later b4 90 manual climate control/heater box swap into a CQ in the past with a friend. Is that not an option? I don't remember how that affected wiring harnesses, but it makes vent actuation simple.
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Re: CQ HVAC delete

Postby MikeB25 » Wed Sep 04, 2019 2:02 pm

Definitely an option. If I can find someone that is selling the manual control and heater box, or wants to trade for an automatic unit, that is the route I would go. It would be ideal if the manual controls could be adapted to my auto heater box but it's not clear if that would work.
'90 Coupe Quattro (AAN swap underway)
'93 UrS4 (organ donor)
'02 A4 1.8T Quattro (bone stock daily)
'08 Q7 (lemon)
'12 S4 (Stage 1...for now)
MikeB25
 
Posts: 50
Joined: Aug 21, 2018

Re: CQ HVAC delete

Postby pete82 » Wed Sep 04, 2019 6:06 pm

Hi Mike

I think I responded to this on facebook the other day.

This is the thread for the guy who used a cabriolet rear window demister on the front screen in his track car, well worth a read.

https://www.s2forum.com/forum/general/open-topic-new/50172-audi-80-saloon-s2-nearly-finished
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