User Tag List

Reply
 
LinkBack Thread Tools
  #1  
Old 01-27-2009, 09:37 PM
jeet's Avatar
Rookie
Thread Starter
Join Date: Jan 2009
Posts: 8
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default Engine fan stays on

Freightliner century class engine fan stays on all the time. When ignition is turned on, the screen in dash will show active fault. " AC Controller No Response 190 s 270 7 ". The ac on this truck does not work ( leak some where in ac condensor ). Any guess what might be causing this ? help is appericiated in advance. Thanks...
Reply With Quote
  #2  
Old 01-27-2009, 11:35 PM
TractorHauler's Avatar
Rookie
Join Date: Jan 2008
Location: Troy, MO
Posts: 33
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default

The engine fan will only stay on for a few reasons. Mosf of the time the fan clutch solenoid is bad. It is an electric solenoid that turns the fan on and off. You can find it by following the air line that comes from the fan clutch hub. In you case, it may be the A/C high or low pressure switch since you are getting an A/C trouble code. There should be a high pressure switch and a low pressuer switch on the A/C lines. Usually the problem is one of these things. Hope this helps.
Reply With Quote
  #3  
Old 01-28-2009, 12:00 AM
RockyMtnProDriver's Avatar
Senior Board Member
Join Date: Jun 2005
Location: Somewhere between Western Canada and Texas/California
Posts: 1,623
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default

Might be a short in the switch itself, always in the on position, even when it is in the off. I am not certain that would explain the code fault though.
Reply With Quote
  #4  
Old 01-28-2009, 09:23 AM
jeet's Avatar
Rookie
Thread Starter
Join Date: Jan 2009
Posts: 8
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default

rockymtnprodriver, is this the switch in the cab, (which is used to turn ac on and off ) are you pointing towards.
Reply With Quote
  #5  
Old 01-28-2009, 11:32 AM
boneebone's Avatar
Board Regular
Join Date: Nov 2004
Location: Somewhere in this World
Posts: 333
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default

Quote:
Originally Posted by jeet View Post
rockymtnprodriver, is this the switch in the cab, (which is used to turn ac on and off ) are you pointing towards.
No, it is in the engine compartment, it is a sensor.
Reply With Quote
  #6  
Old 01-29-2009, 05:25 AM
Larry227's Avatar
Rookie
Join Date: Sep 2008
Location: British Columbia
Posts: 46
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default

A bad fan clutch solenoid is usually the first thing to look for but could be several things. Loss of air to it, the engine temp sensor sending a bad signal to the engine ecm or the engine ecm interpreting the signal wrong, or the engine ecm receiving or thinks it's receiving a signal from the a/c high pressure switch. Could even be as simple as a bad relay.

Since you say you have an a/c fault code it could very well be associated with that. If you have anyone look at it be sure to mention the a/c fault. Depending on the engine they should be able to connect to the engine ecm and turn off the a/c input to see if the problem goes away. If it does you can leave it that way until you get the a/c repaired, just remember to have it turned back on in the ecm when the repairs or done or it will cause more problems when you start using the a/c.
Reply With Quote
  #7  
Old 02-01-2009, 01:18 AM
Windwalker's Avatar
Board Icon
Join Date: Oct 2005
Location: Been there and gone...
Posts: 6,412
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Default

The system is designed "FAIL-SAFE". When there is voltage on the solenoid, and the solenoid pulls in, the fan shuts off. Since it stays on all the time, I would first try turning off all fans, in the bunk, and on the dash. Without the fans on, the A/C will not operate, and the fan should shut off if that's the problem. However, if it does not, I would use a volt-meter and check for voltage at the plug to the solenoid. If you do have voltage at the plug, and the solenoid is not pulling in, I'd go for the solenoid. If the fan shuts off when you turn off both blowers inside, it's going to be an A/C problem.
__________________
( R E T I R E D , and glad of it)
YES ! ! ! There is life after trucking.
a GOOD life

Reply With Quote
  #8  
Old 02-01-2009, 03:10 PM
marcel27208's Avatar
Senior Board Member
Join Date: Aug 2006
Location: salisbury,NC
Posts: 1,045
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default

fan solenoid probably cheapest option.....only takes 5min to replace and i paid $99 dollars for the part at the TA
Reply With Quote
  #9  
Old 02-01-2009, 08:48 PM
bob h's Avatar
Senior Board Member
Join Date: Oct 2006
Location: Nb
Posts: 752
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default

Quote:
Originally Posted by jeet View Post
Freightliner century class engine fan stays on all the time. When ignition is turned on, the screen in dash will show active fault. " AC Controller No Response 190 s 270 7 ". The ac on this truck does not work ( leak some where in ac condensor ). Any guess what might be causing this ? help is appericiated in advance. Thanks...

I would call my dealer and ask for a fault code description. it's possible that the a/c fault is causing a loss of head pressure signal, which might keep the fan on... even if the a/c system is turned off. Or, the a/c hp switch could be bad... keeping the fan on. or, wiring for the switch... if that circuit opens, the fan stays on.

Or, the fan solenoid could be bad... or its ground... or live. Air supply to the solenoid? Engine temp input? Oil temp input? in some, even ambient air input can turn on the fan... dash override switch bypasses fan controls, it could be bad. maybe the fan clutch is seized on... is it a Kysor?

Does the fan spin free when the key switch is off? ...how about when the key is on (engine not running)?
__________________
Bob H
Reply With Quote
  #10  
Old 02-01-2009, 09:21 PM
Kranky's Avatar
Senior Board Member
Join Date: Jun 2006
Location: Wisconsin
Posts: 1,102
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default

Quote:
dash override switch bypasses fan controls, it could be bad.
....or maybe the fan override switch is in the override position and nobody is noticing.

.
__________________
If you can't shift it smoothly, you shouldn't be driving it.
Reply With Quote
Reply





Thread Tools

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



All times are GMT. The time now is 08:55 AM.


User Alert System provided by Advanced User Tagging v3.3.0 (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.