Oh no, HVAC issues...

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08-18-2014 | 10:11 AM

#46

STUARTQ

Three Wheelin'

Joined: May 2012

Posts: 1,595

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From: Switzerland

Quote:

Originally Posted by pi5tolpete

For stepper and 12v type servos, RC does provide. Have a look here. No affil

no link

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08-18-2014 | 12:45 PM

#47

wwest

Drifting

Joined: Sep 2001

Posts: 2,467

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From: redmond wa

Sounds as if it's the small blower that sucks/blows cabin atmosphere over the IAT sensor.

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08-18-2014 | 04:11 PM

#48

Henriks 964

Instructor

Joined: Jul 2004

Posts: 234

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From: The Netherlands

Quote:

Originally Posted by ToreB

The CCU fan runs constantly at ignition on, and up to 20 minutes after ignition off. There is no connection between this fan and the others in the car other than the above.

On all (not the very latest) 964 models, the minimum main blower fan speed is "1", even if the dial is set at 0.
Cheers,
Tore

Tore and Stuartq thanks for the information.

Last edited by Henriks 964; 08-18-2014 at 04:11 PM. Reason: typo

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02-20-2016 | 01:39 PM

#49

TYPE911

Rennlist Member

Joined: Jun 2001

Posts: 1,048

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From: Colorado

Quote:

Originally Posted by STUARTQ

no link

Where/what is the link. I am in need on my 964...

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05-22-2017 | 04:56 PM

#50

Beezztie

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Joined: Feb 2017

Posts: 108

Likes: 42

From: Rotterdam, Netherlands

Quote:

Originally Posted by ToreB

The mixing chamber temperature sensor is a NTC for sure, not a thermocouple sensor. However, I am unsure of the NTC value, I expect it to be a normal 12,5kOhm type based on the car schematics information (12,5k @20 degC) and on the other sensors used in the HVAC system.
Cheers,
Tore

I have a broken sensor at the right mixing chamber, taking it out there was no resistor present anymore, only the two wires that held it

Did anyone find out it it is indeed a NTC, and what value?
I found this one:
B57164K0103J000
2904
B25/100 =4300K, R25 =10000Ω, TR =25°C, ∆RR/RR =±5%

@20dgr. Celcius:
Rnom[Ω] 12683ohm
Rmin[Ω] 11949
Rmax[Ω] 13418
https://www.conrad.nl/nl/epcos-b5716...ks-500622.html
That might do the trick?
Seems silly buying a new sensor for approx. € 160,- while it really is only a € 0,50 component that failed?

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05-22-2017 | 08:29 PM

#51

mojorizing

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Joined: Mar 2002

Posts: 1,295

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From: Kauai

I'd say that's the one. I have a spare HVAC harness with sensors, and I got correct ohms as per the spec. info from your link for the 4300K (0 deg C/ 35K ohm and ambient 27 Deg C/ 9.2K )

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05-23-2017 | 02:52 AM

#52

ToreB

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Joined: Apr 2004

Posts: 2,458

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From: Oslo, Norway

The sensor is indeed an 10k NTC, the above mentioned type will be fine.

You could choose a "water drop"-type sensor instead of the disc type. This is smaller and might have a faster temperature response. It could be easier to place into the plastic tube too. Soldering in a new sensor is done in a few minutes.

Cheers,
Tore

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