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Discussion Starter · #1 ·
Hi all,<p>It would appear that the "resistor" has gone bad in my old 850 (which still hangs around my house and gets used by my dad on occasion). I replaced the fan motor, so I know the problem isn't that, but the fan has stopped running. I suspect the "resistor" is now the culprit.<p>Anyway, I searched around and came up rather empty, but does anyone know if there's a way to fix the "resistor" pack for these cars? I'm hoping there's a $5 fix (like for the capacitors for the fuel pump relay and the resistor for the manual climate control), but I could not find any guides or anything. I vaguely remember reading something about how some transistors go bad in the ECC "resistor" module, but couldn't find anything of the sort...<p>So, if anyone happens to know of a fix, I would greatly appreciate it if you could share! Would love to not have to shell out ~$100 for a new module when just a little piece goes bad...<p>Thanks! <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0">
 

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Re: Anyone know if there's a fix for ECC "resistor"? (StarmanDXE)

Simple answer, who knows!<br>No one to my knowledge has ever tried.<p>Buy the new resistor.<p>Didn't you know you're SUPPOSED TO REPLACE <U>BOTH</U> when you have the symptoms of a bad blower motor?
 

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Discussion Starter · #3 ·
Well, here's hoping <i>someone</i> does happen to know!<p>And: meh, maybe I did, maybe I didn't know to replace both. Regardless, the motor was squealin' like a pig, and I'd pulled it out enough times that it really was no big deal for me to do anymore. Also, replacing two components at the same time in order to diagnose a problem is hardly scientific! Kinda hard to keep tabs like that...
 

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Re: Anyone know if there's a fix for ECC "resistor"? (JRL)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>JRL</b> »</i></TD></TR><TR><TD CLASS="quote">Simple answer, who knows!<br>No one to my knowledge has ever tried.<p>Buy the new resistor.<p>Didn't you know you're SUPPOSED TO REPLACE <U>BOTH</U> when you have the symptoms of a bad blower motor?</TD></TR></TABLE><p>So...If you burn out a light bulb that's on a dimmer, do you replace the dimmer as well?<br>Because that's pretty much the deal here. Motors are like light bulbs. They die.<br>Power Stages are the same as a dimmer. It's a variable output power supply that <br>should operate for <I>decades</I> if the motor doesn't kill it when <B>it</B> goes.<p>So - Another short answer is NO - you aren't SUPPOSED to replace them together. Sorry, Jim.<p>That said, which system are we talkng about here? Manual or electronic?
 

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Discussion Starter · #5 ·
Thanks for the reply.<p>This is in reference to the electronic climate control (ECC). I found a repair guide for the manual climate control resistor pack over on <A HREF="http://volvospeed.com/vs_forum/index.php/topic/106427-blower-resistor-repair-guide-850sv70/" TARGET="_blank">VolvoSpeed</A>, and am hoping there's a fix for the ECC resistor pack as well... :-/<p><br><b>Edit:</b><p>Well, I guess I just wasn't looking right yesterday! I thought I had seen info on this fix before... It <i>is</i> a transistor which goes bad. <A HREF="http://www.brickboard.com/AWD/index.htm?id=1202115" TARGET="_blank">Here's the thread talking about the fix.</A> Now I just need to find a source for the transistor... <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/rolleyes.gif" BORDER="0"> <BR><BR>
<i>Modified by StarmanDXE at 3:39 PM 7-27-2009</i>
 

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Re: (StarmanDXE)

I seem to recall someone posting about replacing the final output device<br>on that powerstage. <br>I think it was either at Matthew's or VolvoSpeed...
 

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Re: Anyone know if there's a fix for ECC "resistor"? (BEJinFbk)

<br>No it IS correct.<br>You don't know if the resistor burned up when the motor took a crap....or did a bad resistor burn up a motor? <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/rolleyes.gif" BORDER="0"> <p>It's not always easy to tell which came first, the cart or the horse, so most shops around here just replace both as there's no extra labor to do that!
 

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Discussion Starter · #8 ·
Well, found <A HREF="http://www.brickboard.com/AWD/volvo/1285290/850/blower_power_stage_fix_pics.html" TARGET="_blank">another thread with pictures</A>.<p>Also, I think <A HREF="http://www.fairchildsemi.com/pf/FQ/FQA90N08.html" TARGET="_blank">this transistor</A> would be quite a good replacement, but, regardless of the fact that it's the same dimensions, I have no idea if the TO-3PN is made any differently than the TO-3PB which would cause any problems... (Why must electrical components be so mysterious?!)
 
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