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993 Climate Control Unit

MHD993

By MHD993
in 993, 993 TT Series

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MHD993 Member

MHD993

Posted
Posted

The climate control unit on my 95 993 isn't working properly. When either the A/C, max A/C or recirculating buttons are pressed, the fan ceases in the cockpit after about 2 seconds (but a fan noise can still be heard coming from inside the dash). When the A/C or max A/C buttons are depressed (released), the fan begins blowing again and cold air can be felt for a moment or two. Accordingly, it appears that the CCU is shutting down interior (to the dash) vents?? when these buttons are pressed. My local dealer estimates a replacement CCU to be in the neighborhood of $1k + labor. I have noticed a few sites selling remanufactured CCUs, but I'm worried I may be paying for someone else's problem. Does anyone have any advice regarding this type of issue?

Thank you.

  • 10 months later...
Waffen Member

Waffen

Posted
Posted
The climate control unit on my 95 993 isn't working properly. When either the A/C, max A/C or recirculating buttons are pressed, the fan ceases in the cockpit after about 2 seconds (but a fan noise can still be heard coming from inside the dash). When the A/C or max A/C buttons are depressed (released), the fan begins blowing again and cold air can be felt for a moment or two. Accordingly, it appears that the CCU is shutting down interior (to the dash) vents?? when these buttons are pressed. My local dealer estimates a replacement CCU to be in the neighborhood of $1k + labor. I have noticed a few sites selling remanufactured CCUs, but I'm worried I may be paying for someone else's problem. Does anyone have any advice regarding this type of issue?

Thank you.

I'm curious how you resolved this issue. I realize this is an old post but I'm having the same problem in my 993 now and have been debating the merits of buying a $300 used unit instead of a $1000 reconditioned unit.

I'm also curious if this is a common problem on 993s.. Do these things just tend to go bad after a while? If so I'd rather shy away from a used unit. It seems like there are a lot of them for sale out there so there must be a demand for them.

Anyone else have experience with this?

MHD993 Member

MHD993

Posted
  • Author
Posted

I first asked my Porsche shop to verify the problem was with the CCU and not with the relays. Once verified (hooked up a functioning CCU and all was well), I debated the merits of used versus reconditioned. Ultimately, I chose reconditioned (ie. warranty). And it did cost around $1k! If the issue were to occur again, I might try a used unit (as long at I could return it if it didn't work). On a related subject, the winter prior to the failure was the only time I had stored the car with a "battery manager" attached. I'm unsure if the two are related, but the car came out of storage with a non-functional CCU. As for this being a common fault, I agree ... there seem to be a lot of used CCUs on the market. However, I had several "experts" tell me these things are "bullet-proof" ... go figure.

Waffen Member

Waffen

Posted
Posted

I ended up taking mine apart and fixing it. It seems to work fine now. Mostly it looks like there was some residue on some of the components that needed cleaning up. I suspect this might be caused by a damp environment, but it's hard to be sure.

Anyway, I'm a happy camper and saved myself a load of cash..

  • 1 year later...
greyes59 Member

greyes59

Posted
Posted
I ended up taking mine apart and fixing it. It seems to work fine now. Mostly it looks like there was some residue on some of the components that needed cleaning up. I suspect this might be caused by a damp environment, but it's hard to be sure.

Anyway, I'm a happy camper and saved myself a load of cash..

Hi,

I have the same problem with my 993. I would like to know you accessed the aircon CCU and cleaned it.

I would appreciate your help.

best regards,

George

993 coupe 1995

greyes59 Member

greyes59

Posted
Posted
I ended up taking mine apart and fixing it. It seems to work fine now. Mostly it looks like there was some residue on some of the components that needed cleaning up. I suspect this might be caused by a damp environment, but it's hard to be sure.

Anyway, I'm a happy camper and saved myself a load of cash..

I think my CCU is malfunctioning but I do not want to buy a new one since this problem just occured out of the blue. I would appreciate any tips on removal of the aircon CCU and cleaning of the same device.

  • 2 years later...
  • 2 weeks later...
  • 2 months later...
  • 8 years later...
Heidi993 Member

Heidi993

Posted
Posted

I know this is an old topic - but i am having problems, 

My CCU is not working full stop.
It is dead.
I plan to remove it soon to see if I can fix it, but in the meantime, here are a couple of related links:

https://rennlist.com/forums/964-1989-1994-911/687307-ccu-button-replacement.html
https://www.bergvillfx.com/ccurepair

https://rennlist.com/forums/993-forum/950555-hvac-unit-dead-trouble-shooting-check-list.html

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