Climate Control Only - Blower Stays On - Chevy Impala SS Forum
 1Likes
  • 1 Post By 96 Black
 
LinkBack Thread Tools Display Modes
post #1 of 1 (permalink) Old 09-14-2018, 09:37 AM Thread Starter
Senior Member
 
Join Date: Jan 2001
Location: St. Louis
Posts: 7,705
 
Climate Control Only - Blower Stays On

Just for Search in this section, based on recent thread in Parts For Sale / Wanted I'm bringing over diagnostics uncovered myself and intel gathered from others on this problem. https://www.impalassforum.com/vBulle...ply&p=12090720

Since this a combo age and temperature type failure it seems will become more and more evident in our rigs. The story starts when noticing after 5 minutes on the interstate that the A/C switched from 'normal 65 high' sounding blower up to the '60 supermax' speed - all on its own. It had never done that before (nor in my last FWB for 16 years) but did not see a big deal at the time. When parking and jumping out I just happened to halfway notice that the blower remained on after turning off the engine.

Recalling the strangeness earlier on the highway I figured it had to be a welded closed relay (with Climate Control it's called a module) so to keep from a dead battery after an hour I tried pulling all the IP HVAC related fuses but it kept running strong. I wasn't going to start yanking fuses under the hood so ran back home and got out the Impala SS and resumed plans. I got to hunting for a used 16173860 Blower Control Module based on FSM:







Tearing the old part apart I noticed the (scant and dried up) thermal paste and glad it lasted over 20 years in the first place:






I snagged one used from a Vette ($38) off ebay and *$%# - rats didn't work. I ran the diagnostic (20 more times), checked a bunch of grounds and even did extra testing from here:

https://troubleshootmyvehicle.com/gm...esistor-test-1

So, I admitted defeat and ordered a new one, but opted for the "not $110 ACDelco branded unit but instead the $35 Jeep Cherokee unit" option.

Plugged in and VOILA! But there's a catch. Or two. 1.) The bracket and bolt mount is different. No big deal, just 2 screws and switch them:





2.) The heatsink is different. Even with the original mount I had difficulty lining up the screws and tightening. The fins on the Jeep heatsink are interference with the side of the plenum. With thermal paste left over from a computer repair I could have easily switched heatsinks:





But, I decided smarter to leave stuff alone and simply double up part of the foam seal from the old housing to tilt the whole unit a few degrees away from interference and still retain a decent seal (think "doubling the back part of the exhaust manifold gasket to seal a No. 7 or 8 broke off bolt...")

That's about it. Any time I'm near the blower motor on these cars I just drop it to remove junk that is guaranteed to be in the cage and add 2 drops of 3-in-1 to the motor. Blower speed ALWAYS improves:

gbhs72 likes this.

\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear). Finally, wait for it... LT-4 knock module!
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, yes again... LT-4 knock module!
96 Black is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevy Impala SS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome