Intrinsicate

In the duct that takes air to the alternator, there is a probe that looks like a temperature sensor, presumably measuring ambient air? Where is the
temperature reading sent?

Greg86andahalf

It's the OAT (outside air temp.) sensor going to the HVAC system

Jim bailey - 928 International

Correct part number 928 659 021 01 ....outer sensor for automatic air conditioning . Which is NO LONGER MADE , no longer available from Porsche and without which the climate control can not function correctly when the temperature control is any where but full hot , full cold . That 's the one !

tuk_928

Jim,
So, when that part fails....what are we to do?

ps.
Thanks for the PM on the seats.

Garth S

That indeed would be the one - and that's the story ....
Jim, all sorts of Audis, BMW, etc have ambient temp sensors, although I don't know what they use for a climate control reference temp. Do you, or anyone know of the type and characteristics of this NLA (RTD?)sensor or where to find the specs. I would think that adaptable sensors could be sourced if the characteristics were known - or is this a long dead end topic?

Jim bailey - 928 International

Smart a$$ reply ........... be too hot or too cold . What needs to happen is reverse engineer a replacement temperature sensor ....variable resistance based temperature unit to feed the correct signals to the A/C control head . Until then source good used units although I believe we may have one new unit left in stock .

SharkSkin

It's a thermistor, right? With the original and a bit of test equipment the spec could probably be deduced, if not available outright. Shouldn't be rocket science finding an appropriate replacement. Worst case, inside & outside thermistors are run through a comparator and you might have to replace both.

Ed Taylor

GarthS etal,
per the wsm:
0 deg C=933 ohms
20degC=588 ohms
30degC=457 ohms

Chris

Taking Ed's numbers this one would seem to work:

http://www.digikey.com/scripts/dksea...274052&Site=US

Chris

2V4V

Yup, as long as the curve sorta matches, Chris has the answer. It's a simple commonly available part (I'm sure Mouser stocks the same thing if Digikey runs low).

Just have to coat it and attach to the housing.

Greg

murray928

Resurrecting this old thread to enquire if anyone has found a suitable replacement for the temperature sensor in the alternator ducting.

928NOOBIE

I got one on eBay...was in great working order and also purchased all new ducting from a place online that sold airplane air duct...nice heavy duty vinyl with wire wound through it. Has held up extremely well.

http://www.aircraftspruce.com/catalo...p?recfer=15594

Danny Humphreys

Am in same boat, anyone know the part # for the digikey replacement? Link no worky

worf928

FYI, I'm pretty sure the Porsche part is available again. Stupid expensive. But available.

DuncanF

Was certainly available new from Porsche a year ago as I bought one. Didn't realise that there was an alternative.