Blower Fan won't stop - replaced resistor pack already

joanywhere · Mar 9, 2013

All,
I've got a 1999 Saab 9-3 with single zone electronic climate control.

The climate control refuses to shut off after the car is turned off, and while it is running the fan speed is almost always on high (every so often it dips down to the actual fan setting).

I've actually had the climate control disconnected for a year or so as it took me that long to track down a resistor pack (as I'd read this was a common problem), and this has now been replaced. It seemed OK for a while (maybe wishful thinking?), but then the original fault came back.

Is it feasible that the resistor pack has gone faulty that quickly (i.e. in two months), or should I be looking elsewhere? Does the control unit itself ever go wonky?

Any help and thoughts appreciated.

Regards
Jo

Steph · Mar 9, 2013

http://www.saabwiki.info/index.php?title=NG_900/9-3_Radiator_Fan_Test

Hi,

Perhaps the above link, can throw some more light, on this for you.

Steph

boris · Mar 9, 2013

Information on given link is for the radiator fan. Thread author has problems with AC fan, at least I understand it in that way. Sounds like a short circuit to me. Are you familiar with car electrics?

joanywhere · Mar 9, 2013

Boris, it is indeed the AC fan that is the problem.

Moderately familiar and I can follow instructions

I know what a common ground is, and am handy-ish with a multi meter

boris · Mar 10, 2013

ACC can be tricky to diagnose. You have allready calibrated the ACC and got no errors, right?

The blower motor has permanent +12V and is grounded by the fan control module (also referred as 'resistor pack', though it is far more functional than that). This module is again controlled by the main ACC control module.

SO the first step should be recalibrating the ACC. Then it gets more complicated with (DIY-able) measurements under the dash. Are you willing to do that?

joanywhere · Mar 10, 2013

boris said:
ACC can be tricky to diagnose. You have allready calibrated the ACC and got no errors, right?

Boris,
Thanks for all the help. I'll start with step one of your response

Nope - I've not calibrated the ACC.

From some quick googling, it looks like I do that by disconnecting the climate control unit.. re-connecting it, and pressing 'AUTO' and 'OFF' simultaneously. Presumably I do this (the button pressing step) with the ignition on?

Regards
Jo

boris · Mar 10, 2013

Never mind the disconnecting. Just press auto + off, of course with ignition on. The ACC will do some weird behaviour and then display error number(s) - preferrably 0.

joanywhere · Apr 28, 2013

Boris,
I've finally had a chance to do this, and get online to post the results. Your lotto numbers are (or at least, my ACC error codes are).... 02, 04, 22

Regards
Jo

joanywhere · May 14, 2013

Just trying to get this back to the top of the pile

. I'd love to work out the next steps in diagnosing/repairing this

aerojon · May 15, 2013

is it the a/c fan or the cabin fan that staying on

Blower Fan won't stop - replaced resistor pack already

Our Vendors

Top Contributors this Month

Recommended Communities