Heater fan problems

[Alex Kowalski]

Scott Mockry has an article about testing/replacing the blower motor on his website, and some discussion of the how the system operates, and diagnostics:

http://www.sjmautotechnik.com/trouble_shooting/ac.html

Also, please feel free to correct me, but I thought that in cold weather the fan did not run at all until the coolant had reached at least lukewarm temperature.  At least on my car, that's the way it works.  From a cold start, it takes about two minutes for the motor to switch on regardless of the settings on the climate control panel.

HTH,
Alex


> Message: 7
> Date: Sun, 26 Dec 2004 17:32:44 -0700
> From: Zsolt <zsolt1 at telusplanet.net>
> Subject: Heater fan problems
> To: <quattro at audifans.com>
> Message-ID: <6.0.1.1.2.20041226172431.02866d40 at pop.telus.net>
> Content-Type: text/plain; charset="us-ascii"; format=flowed
>
> My heater fan has started acting up recently. It is also pretty cold right
> now, so it's not pleasant. The car is an '88 5ktq, and the symptoms as
follow:
>
> - the fan seem to come on by itself in ECO mode when the car is first
> started up
> - in DEFROST mode it doesn't start until it starts blowing by itself (it
> used to start blowing immediately when it's pressed even cold engine)
> - when the engine is re-started, the fan doesn't come on for a looooong
> time, or at all.
>
> I am guessing it's the digital controller unit. Any BTDT?
>
> Thanks, and Happy Holidays everybody!
> ZSolt