Search results

I would get the damper replaced. They recommend changing it out at around 350,000 miles. I had mine done and it ran much smoother. If it goes it can mess alot of stuff up.

Yeh it idles cool at 30 degrees. I had one thermostat replaced last spring but I did not know there are two. Maybe that is it. Fluids are fine there is no mixing of oil and what not. Fan does not stick and I had a pressure test done also in the spring and everything tested fine. I am thinking it...

Yeh I tried that as well still nothing.

First off thanks again to Greg and Dave for the advice on my sensor. I just replaced it I haven't checked to see if it works yet. I wanted to find out if it is normal for my engine to idle at 120 degrees and below. The problem is I have no heat in cold weather unless I am moving. As soon as I...

I have used the oil treatment and the injector cleaner and both have worked well. The injector cleaner does help with increased mileage, but that may be due to the fuel running more rich. I also talked with a Landstar O/O who spoke highly of it. We both have straights, Cummins and CAT.

So how do I bypass the sensor? Just unplug it? Also I filled up on fuel yesterday and noticed the light came on very little then as the fuel level dropped the light came on more. Coincidence?

How do I bypass the sensor?

Thanks again for the info

Okay vertical is open so the mechanic opened it back up. I still don't know why there was pressure if the engine was cold. Could it be my sensor is just bad?

I checked the wiring and as far as I can see it is fine. The coolant level is good but when I removed the cap there was a small amount of pressure released. I usually do my own PM's but had a shop do the last one. It looks like the coolant filter valve was not opened back up after the filter was...

The code is a 422.

Sorry for the delay in reply I spent some quality time with my family last week. I am going to eat lunch then head out to the truck to test all of the input I received.

I did a search in this forum and checked the wires and fluids all seem fine.

I have my check engine light coming on sporatically. It may be a coincidence but on my last trip as I would go down a hill then back up it would come on then go off. It's as if something is loose or a fluid is low. I checked the oil and the level is fine. Any thoughts???

the air pressure gauge fitting. It would leak more in cold weather.

Ok I am pretty sure this will be my last reply on this thread. I wanted to give a plug for a great mechanic. I got a load up here to Minnesota and had the money to fix the air problem. It was the governor as well as a leaking fitting behind the dash. I took the truck to Independant Diesel Repair...

Thanks Greg, from what everyone says when I get the governor in hand it should be self explanatory as to where it goes on the compressor. One dealer did say the dryer could have been left off of the build sheet so I came here. Even if I had the money to send it to the mechanic I want to know...

I spoke with two Freightliner dealers and both of them said there is no dryer on this model. Unless it was not included in the original spec sheet.

It appears draining the tank is not the only problem. The brake system worked fine coming back from Ohio, but this morning the system would not build pressure. I intended to replace the governor anyway. Two questions 1) Where is the governor? 2) How do you diagnose the dryer to find out if it...

I appreciate all the info and while pleased I am a little embarassed to say the problem was water in the service tank. I changed the tank last spring because the previous tank had a pinhole leak and never held water. Needless to say it had plenty of water, but when drained the dryer valve...