Menu toggle

heater/temp control

silver7

silver7

PCGB Member
Hi - can someone please advise of what this could be. When you set the temp control at a certain level (say warm, it will then start to blow cold after a while. The car has a/c which works (i.e blows very cold) but it only seems to like to hold very cold or very hot. The temp sensor does not have any fluff blocking it and the little fan behind it works - All ideas appreciated. Slowly going mad!
 
I had the same problem a few years ago. Turned out to be a faulty temperature sensor. Replaced it and works fine now.
 
i think it is the one within the cc - I cant see it on the PET though to order one, anyone help?
 
The interior sensor is indeed in front of the little fan inside the HVAC unit.
The sensor is not available separately.
With a Bosch hammer or the PST2, you can find the problem in no time.
Sometimes it is far easier that way than to search yourself for 3 weeks.[&o]
 
If you can't find someone to repair it, you can get a new (£££) unit from Porsche, but also an exchange unit.
Still, you better do some tests first, just to be sure what the cause is.
 
I have to turn mine up full to get any warmth then when I can feel the heat turn it down to the setting required. I'm not sure why either!

Graham
 
Just before anyone goes off ordering new heater control units, isn't there another temperature sensor, in the plastic down pipe which leads from the heater fan in the engine bay ? Might be worth checking that too, although I agree it's more likely to be the one in the cabin. When mine died it made the fan pulse annoyingly. It's only a couple of quid for a new one though, so might be worth replacing it anyway.
 
There is definitely one in the plastic pipe which connects the engine bay heater fan to the heat exchangers. Mine died a couple of years ago - replacement was easy and relatvely cheap.
 
thats good news, I think. Any info on part number would be appreciated. Did this cause the same issues (unstable temp?)
 
No not really. The engine heater fan used to pulse on and off- that was about it. There was no shortage of hot air in the cabin. You need to take it to a specialist near you who you can trust. I took mine to Steve Bull - there's not much they don't know about 911 heating systems. They will test it and give you the definitive answer - could save you £££s in the long run. Is there a specialist near you ?
 
ok thanks, will do. I have managed to pick up a secondhand CC unit, which I may try first. As it was for my car (LHD) I could not resist
 
The symptoms you describe sound remarkably normal. Are you sure that there is actually something wrong with your system? The system is well known for not being able to maintain a constant temperature. I constantly have to readjust the temp control to remain comfortable, and as you describe it will automatically switch from blowing hot to cold.

I have heard of people relocating the temperature sensor outside of the dashboard control unit. Can't remember where i saw the reference, may have been on Rennlist.

pp
 
no I am not sure to be honest but on a long trip the other day it seemed v odd, always turning it up and down. I probably need to take it to a specialist to look at, they are all a distance from me and the whole dropping it off, picking it up thing just drives me crazy. The car does adjust hot and cold but sometimes the middle setting is cold, sometimes warm. Another weird thing is if you use both snowflakes then it blows very hard.
 
You must log in or register to reply here.

Posts made and opinions expressed are those of the individual forum members

Use of the Forum is subject to the Terms and Conditions

Disclaimer

The opinions expressed on this site are not necessarily those of the Club, who shall have no liability in respect of them or the accuracy of the content. The Club assumes no responsibility for any effects arising from errors or omissions.

Porsche Club Great Britain gives no warranties, guarantees or assurances and makes no representations or recommendations regarding any goods or services advertised on this site. It is the responsibility of visitors to satisfy themselves that goods and/or services supplied by any advertiser are bona fide and in no instance can the Porsche Club Great Britain be held responsible.

When responding to advertisements please ensure that you satisfy yourself of any applicable call charges on numbers not prefixed by usual "landline" STD Codes. Information can be obtained from the operator or the white pages. Before giving out ANY information regarding cars, or any other items for sale, please satisfy yourself that any potential purchaser is bona fide.

Directors of the Board of Porsche Club GB, Club Office Staff, Register Secretaries and Regional Organisers are often requested by Club members to provide information on matters connected with their cars and other matters referred to in the Club Rules. Such information, advice and assistance provided by such persons is given in good faith and is based on the personal experience and knowledge of the individual concerned.

Neither Porsche Club GB, nor any of the aforementioned, shall be under any liability in respect of any such information, advice or assistance given to members. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times.

Porsche
Lockton
Pirelli
Officially approved
Oracle Finance
WEX Esso
Collecting Cars
Archant Dialogue
Back
Top