Freightliner FL60 questions

Alan Roehrich · 12-09-2012, 11:22 AM

On a Freightliner FL60, (Cat engine and 6 speed automatic) we're looking at some problems that may not be catastrophic, but they are nerve wracking.

First, the fan clutch has a mind of its own, and comes on constantly when it is not needed at all. When it starts doing that, the fan comes on and goes off almost as if it is on some sort of timer. It does not do this when it is fairly hot, nor when it is fairly cold, but rather when the outside temperature is relatively moderate.

Next, the fan and tach are rarely accurate, and work intermittently. Can't be sure if there are problems with the sensors, with the computer, or with the instrument cluster.

Any help would be appreciated.

Perko · 01-05-2014, 07:54 PM

Alan,
You didn't say what year that truck is, but some of the newer units control the fan through the bulkhead module and or the engine module. Either could give you trouble. Start by checking and cleaning every ground connection you can find, engine, frame, batteries, under dash, firewall, etc. Freightliners are very picky about their electrical grounds. Most good Freightliner shops can fix you up without picking your pocket to badly.
Perko

Mike Gardner · 01-06-2014, 02:57 PM

I agree with the grounding problems on the Freightliners. We had an FL112 that was grounding the engine through the braided power steering hose. Obviously that didn't last long. There were no (zero) grounds to the engine from the factory.

All it took was a heavy battery cable type ground wire from the block to the frame and everything worked great.

12-09-2012, 11:22 AM	#1
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,065 Likes: 1,486 Liked 1,630 Times in 378 Posts	Freightliner FL60 questions On a Freightliner FL60, (Cat engine and 6 speed automatic) we're looking at some problems that may not be catastrophic, but they are nerve wracking. First, the fan clutch has a mind of its own, and comes on constantly when it is not needed at all. When it starts doing that, the fan comes on and goes off almost as if it is on some sort of timer. It does not do this when it is fairly hot, nor when it is fairly cold, but rather when the outside temperature is relatively moderate. Next, the fan and tach are rarely accurate, and work intermittently. Can't be sure if there are problems with the sensors, with the computer, or with the instrument cluster. Any help would be appreciated. __________________ Alan Roehrich 212A G/S

01-05-2014, 07:54 PM	#2
Perko Junior Member Join Date: Dec 2013 Location: Wyoming Posts: 6 Likes: 0 Liked 12 Times in 2 Posts	Re: Freightliner FL60 questions Alan, You didn't say what year that truck is, but some of the newer units control the fan through the bulkhead module and or the engine module. Either could give you trouble. Start by checking and cleaning every ground connection you can find, engine, frame, batteries, under dash, firewall, etc. Freightliners are very picky about their electrical grounds. Most good Freightliner shops can fix you up without picking your pocket to badly. Perko

01-06-2014, 02:57 PM	#3
Mike Gardner Member Join Date: Sep 2006 Location: Northern Virginia Posts: 136 Likes: 0 Liked 0 Times in 0 Posts	Re: Freightliner FL60 questions I agree with the grounding problems on the Freightliners. We had an FL112 that was grounding the engine through the braided power steering hose. Obviously that didn't last long. There were no (zero) grounds to the engine from the factory. All it took was a heavy battery cable type ground wire from the block to the frame and everything worked great.