No power to heater control/dual climate unit when its HOT outside!?

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Lankywardy

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Hi all, hoping I can get some advice on where to even start with this issue.

I have the dual climate system in my A3 8P, when it is really hot outside (like the last week) my heating system just doesn't work. There are no lights on the unit, controls do not work and the blowers don't work. I've had this issue for a while but have always ignored it as usually after a while it decides it wants to come back on, on its own.

If I was to then go out later on in the day, when its cooler, the dual climate system works fine, no issues whatsoever.

Anyone seen this before or have any ideas on what might be causing this issue? It's not ideal when you need the aircon in these temperatures lol.

TIA
 
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Best to have the car scanned where u might find some faults which could give to a heads up where to start looking

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Tbh if the whole unit goes of, then either its a power issue or the unit has a fault, does it have heated seats or not?
 
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ch1z64 said:
Best to have the car scanned where u might find some faults which could give to a heads up where to start looking

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So I have had it plugged in but nothing comes up, but I will take another look when its not working, thanks.

NHN said:
Tbh if the whole unit goes of, then either its a power issue or the unit has a fault, does it have heated seats or not?
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No heated seats unfortunately. I get power to everything else, fuses are fine, its baffling me. I am hesitant to replace the unit in case it is something to do with the heat causing something to expand elsewhere which is shorting it out or something..
 
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Regardless usually if the heater unit goes dead, its either electrical or the unit, the fact it does it after a period of time, well I'd try a different unit tbh as its cheaper overall & proves allot, could spend hours on this ******* in the wind, big thing to discount is the unit itself.
 
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NHN said:
Regardless usually if the heater unit goes dead, its either electrical or the unit, the fact it does it after a period of time, well I'd try a different unit tbh as its cheaper overall & proves allot, could spend hours on this ******* in the wind, big thing to discount is the unit itself.
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Thanks mate, I just had a look on eBay and didn't realise how cheap the units were, I'll go down that route and report back if I still have issue. Thanks for your reply!
 
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Here in Greece during the summer months after parking the car for 8 hours at work, the temperature might be up to 40 or 45 degrees.
The unit never failed to power.
Good for you to test a different unit.
Are you going to replace the unit and hope that you won't face the problem again, or keep the old one and swap it when the problem happens again?
 
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George Kost said:
Here in Greece during the summer months after parking the car for 8 hours at work, the temperature might be up to 40 or 45 degrees.
The unit never failed to power.
Good for you to test a different unit.
Are you going to replace the unit and hope that you won't face the problem again, or keep the old one and swap it when the problem happens again?
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Not 100% sure George, reassuring to know that it doesn't happen for you in those temps. I'll replace it and see what happens I guess, hopefully it solves it!
 
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I have a spare CC unit you can have for just postage cost. It’s the one with the ECO button. I never actually tested it in my earlier A3 2006 as I sold the car. PM me if you want it.
 
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SootySport said:
I have a spare CC unit you can have for just postage cost. It’s the one with the ECO button. I never actually tested it in my earlier A3 2006 as I sold the car. PM me if you want it.
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Thanks for the comment, I have literally (10 minutes a go) just put the replacement in so now it's just a case of seeing if it's resolved the issue when it's hot.
 
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