Heater - AC fan comes on full for 2 seconds; An indication of a dying battery - Jeep Commander Forums: Jeep Commander Forum
Regular Service / Maintenance This section contains discussion about regular service and maintenance (upkeep) of your Jeep Commander

 
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 10-19-2018, 12:47 PM Thread Starter
Senior Member
Points: 32,379, Level: 100 Points: 32,379, Level: 100 Points: 32,379, Level: 100
Level up: 0% Level up: 0% Level up: 0%
Activity: 4% Activity: 4% Activity: 4%
 
rblapham's Avatar
 
Join Date: May 2009
Location: Cleveland TN
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 103,000
Posts: 617
Garage
Heater - AC fan comes on full for 2 seconds; An indication of a dying battery

Yesterday everytime I started the Commander the Heat/AC fan would come on full speed for about 2 seconds and then normal speed. I have the dual zone system and always set to auto everything. Then this morning the commander had a hard time cranking but started - fan still on full for 2 seconds. This afternoon the hemi would not crank. Had to jump. Battery 3 years old so I got it replaced. Fan working normal again, starting fine. Built in alert for a dying battery???

06 Commander Limited Hemi - QDII,
Past -89 Comanche, 98 Grand Cherokee (2WD), 2000 Cherokee, 05 Grand Cherokee Limited 4.7
Had to replace the brakes - they opened more gas stations in town
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Last edited by Big Blue; 01-05-2019 at 06:54 AM.
rblapham is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old 01-04-2019, 04:49 PM
Junior Member
Points: 23, Level: 1 Points: 23, Level: 1 Points: 23, Level: 1
Level up: 45% Level up: 45% Level up: 45%
Activity: 0% Activity: 0% Activity: 0%
 
Biggs's Avatar
 
Join Date: Dec 2018
Location: New Jersey
Own a Commander?: Yes
Model year: 2007
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 145k
Posts: 4
I assume you're talking about the fans that propel air into the cabin of the vehicle? And not the large cooling fan located behind your radiator?

I know if you use the remote start during cold weather, the vent fans will blow full speed until you enter the key into the vehicle.

I'm never experienced any other anomalies with the interior vent fans.


your external cooling fan is actually powered via hydraulics, in junction with your power steering system, god that was a nightmare for a novice to repair.
Biggs is offline  
post #3 of 4 (permalink) Old 01-05-2019, 05:20 AM Thread Starter
Senior Member
Points: 32,379, Level: 100 Points: 32,379, Level: 100 Points: 32,379, Level: 100
Level up: 0% Level up: 0% Level up: 0%
Activity: 4% Activity: 4% Activity: 4%
 
rblapham's Avatar
 
Join Date: May 2009
Location: Cleveland TN
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 103,000
Posts: 617
Garage
Quote:
Originally Posted by Biggs View Post
I assume you're talking about the fans that propel air into the cabin of the vehicle? And not the large cooling fan located behind your radiator?

I know if you use the remote start during cold weather, the vent fans will blow full speed until you enter the key into the vehicle.

I'm never experienced any other anomalies with the interior vent fans.


your external cooling fan is actually powered via hydraulics, in junction with your power steering system, god that was a nightmare for a novice to repair.
Yes as I said "Heat/AC fan" which would be the cabin air, not the engine cooling fan. Yes I know all about the hydraulic Engine cooling fan on the Hemi. Think the crazy electronics running low voltage was probably why the fan acted weird.

06 Commander Limited Hemi - QDII,
Past -89 Comanche, 98 Grand Cherokee (2WD), 2000 Cherokee, 05 Grand Cherokee Limited 4.7
Had to replace the brakes - they opened more gas stations in town
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
rblapham is offline  
 
post #4 of 4 (permalink) Old 01-05-2019, 06:45 AM
Super Moderator
Points: 23,412, Level: 94 Points: 23,412, Level: 94 Points: 23,412, Level: 94
Level up: 7% Level up: 7% Level up: 7%
Activity: 100% Activity: 100% Activity: 100%
 
Big Blue's Avatar
 
Join Date: Oct 2015
Location: East Coast of Florida
Own a Commander?: Yes
Model year: 2008
Trim Package: Sport
Power-Train: 4.7L V-8
4WD
If 4WD - system: QT-II
Current Mileage: 101,200
Posts: 5,335
Garage
Quote:
Originally Posted by rblapham View Post
Yesterday everytime I started the Commander the Heat/AC fan would come on full speed for about 2 seconds and then normal speed. I have the dual zone system and always set to auto everything. Then this morning the commander had a hard time cranking but started - fan still on full for 2 seconds. This afternoon the hemi would not crank. Had to jump. Battery 3 years old so I got it replaced. Fan working normal again, starting fine. Built in alert for a dying battery???
@rblapham;

I don't know if that was a built in, intentional alert for a dying battery per say, but clearly your Heat/AC fan coming on full speed for about 2 seconds and then normal speed, was an indication of exactly that. You were somewhat lucky, I had a battery in my XK die on me when I was out in the middle of a National Forest camping, with no warning signs at all.

Commanders have definitely proven to be very particular about needing a good battery putting out the proper voltage for everything to function properly. I've heard of XK's doing some pretty strange things that were ultimately proven to be caused by a dying battery putting out less than normal/optimal voltage.

3 years is about all you can expect out of a battery these days for the most part.

That's good information, thanks for sharing.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Last edited by Big Blue; 01-05-2019 at 06:56 AM.
Big Blue is online now  
Sponsored Links
Advertisement
 
Reply

  Jeep Commander Forums: Jeep Commander Forum > Jeep Commander Discussion > Regular Service / Maintenance

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Jeep Commander Forums: Jeep Commander 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











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not 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