Chrysler Pacifica Luxury meets versatility in this mid-sized sport utility vehicle

Radiator fans not cycling on

  #1  
Old 05-20-2018, 05:51 PM
Junior Member
Thread Starter
Join Date: Apr 2017
Posts: 15
Default Radiator fans not cycling on

Replaced the radiator with the help of a friend last week. Noticed in the drive through a few days later the temp over 220, then realized I turned the AC off. I turned the AC on and the fans did kick in.

I tested it again, ran the motor with AC off and let it get to 235, fans did not kick on. I checked the connector at the relay, and it seems fine, also the ECTS should be okay since the ECU is getting a temp value. What else should I look for? Fuses and relays seem fine, since the fans do come on with the AC. Any ideas? TIA
 
  #2  
Old 06-03-2018, 12:52 PM
djetelina's Avatar
Member
Join Date: Aug 2010
Posts: 85
Default

Suspect the root cause is your PWM solid state "relay" is dead. This device is located behind the front bumper, about 25 bucks at Rock Auto for aftermarket. Your symptom is no variable speed for your fan, only fan off and full on, see attached PDF. In true Chrysler Pacifica factory manual tradition, the explanation is rather stilted, but still kinda makes sense. Unlike some of Chrysler's other tech explanations which make no sense..
 
Attached Files
File Type: pdf
Pg_230-231.pdf (51.5 KB, 39 views)
  #3  
Old 06-03-2018, 06:27 PM
Junior Member
Thread Starter
Join Date: Apr 2017
Posts: 15
Default

Does make sense, now that you draw it out. Thanks, already ordered the relay. Much appreciated.
 
  #4  
Old 06-08-2018, 11:25 AM
Junior Member
Join Date: Jun 2018
Posts: 3
Default Radiator fans

change coolant sensor and fans will start working again
 
  #5  
Old 06-08-2018, 09:15 PM
Junior Member
Thread Starter
Join Date: Apr 2017
Posts: 15
Default

ETS is fine, temp gauge works as normal. I changed the fan relay behind the bumper and then the car threw a P0480 code. Fans still aren't working like they should with the AC off, but I suspect it's a grounding issue, since I'm having an issue with the horn working intermittently. It's a pretty well documented issue with the IPM on Pacs.

Thanks for the input, though.
 
  #6  
Old 06-15-2018, 09:44 PM
Junior Member
Thread Starter
Join Date: Apr 2017
Posts: 15
Default

So, really odd issue resolved itself, sort of.

Decided to replace the upper motor mount (belt drive side of motor) and after reassembling the air box, the fans now come on at about 220 degrees or so. Also, horn works consistently again. From what I figure, the motor leaning to one side must have been pinching a wire somewhere.

Thanks for all the input, all two of you than replied lol
 
  #7  
Old 06-16-2018, 08:48 AM
djetelina's Avatar
Member
Join Date: Aug 2010
Posts: 85
Default

Thanks for the update regarding resolution! Hopefully your fans also come on when engine is cool, when the A/C pressure starts to ramp up. With fans off and A/C on, the freon pressure is really high, the PCM is programmed to monitor the pressure via the A/C system pressure sensor located on top of the receiver. PCM should kick on fans when pressure hits 250 psig, the condenser pressure then rapidly drops.
 
  #8  
Old 06-16-2018, 03:44 PM
Junior Member
Thread Starter
Join Date: Apr 2017
Posts: 15
Default

Originally Posted by djetelina View Post
Thanks for the update regarding resolution! Hopefully your fans also come on when engine is cool, when the A/C pressure starts to ramp up. With fans off and A/C on, the freon pressure is really high, the PCM is programmed to monitor the pressure via the A/C system pressure sensor located on top of the receiver. PCM should kick on fans when pressure hits 250 psig, the condenser pressure then rapidly drops.
Never had an issue with the fans not kicking on with the AC on... just with them kicking on when they're supposed to when the AC isn't running... just always ran the air lol
 
  #9  
Old 06-19-2018, 06:46 PM
CHRYSLER TECH's Avatar
Super Moderator
Join Date: Mar 2006
Location: Norcross GA
Posts: 8,114
Default

Hey Chris Stephens Coolant temp sensors does what? Tells the pcm what temperature the coolant is. The pcm then tells when to turn the fans on and also tells the cluster what temp the coolant is. So is the coolant temp sensor working correctly?

do a wiggle test with that harness have the fans on ac on see if they cut on or off when you pull on the harness
 
  #10  
Old 06-21-2018, 07:55 AM
Junior Member
Thread Starter
Join Date: Apr 2017
Posts: 15
Default

ETS was not the issue, as the temp gauge worked just fine. Also the issue has been resolved already.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
oldhippie
Chrysler 300, 300C & 300C SRT-8
12
09-30-2017 08:19 AM
Gromit
Chrysler Voyager & Town & Country
19
08-15-2013 04:02 PM
jammozzz
Chrysler Pacifica
9
04-20-2011 09:51 AM
dhhbomb
Chrysler Voyager & Town & Country
0
08-29-2009 07:20 PM
vlsgmc
General Tech
0
04-04-2008 09:26 PM


Thread Tools
Search this Thread
Quick Reply: Radiator fans not cycling on


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.