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Big Trucks

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Sonny Heath

01-06-2002 07:10:03




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Can anyone tell me if there is a site that discusses problems with big trucks? I have a 96 Freightliner with a Detroit engine that has a temperature gage problem. The engine is getting up to operating temperature by feeling the radiator and water jackets but the gage won't go up. It'll go up about an eigth of an inch, then immediately go back down and it keeps doins this nonstop. I have it in a truck shop and he has replaced the electric/air switch that operates the fan (in front of the engine), the controller box under the dash (that controls the fan as well), the temperature sending unit on the water jacket and it still does the same thing. The electric control box made the fan operate properly but I still have this problem with the gage and I'm afraid to go on the road to tractor shows with a gage not working in case I were to lose coolent and run it hot not knowing it. Any advice would be highly appreciated.

Sonny

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Tim McCollum

01-08-2002 08:24:17




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 Re: Big Trucks in reply to Sonny Heath, 01-06-2002 07:10:03  
I don't know if this will help or not,but it won't cost you $500.00 :easy test, hook a set of jumper cables from eng. block to the breaker panel base & the other cable from breaker panel base to the frame. start the eng. & check results;if this does the trick you can check which ground is bad by unhooking one cable at a time. Freightliner has always skimped on grounding all three comp.-eng. frame cab ,this was only a minor inconvenience with a mech. eng.,but can be an expensive & total emotional upset to an electronic eng..One word of encouragement though, if this doesn't work I wouldn't worry about the guage .Your ecm will shut the engine down in the event it does overheat.I presently run a 84 fl. c/o with a mech. cummins & since new I occ. get corrosion on the ground from the starter to the frame at which time the engine goes dead, if restarted at this time the starter is drawing its ground from the eng.-cab connection which includes all sending unit-guages,with resulting guage burn out! Once is enough ,so I added 2 extra grounds to each unit &2,600,000 miles later same guages & I am presently installing the running gear from a wrecked 96 fl.condo-470 ddec 4 etc. Good luck,Tim McCollum

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Sonny

01-06-2002 20:05:45




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 Re: Big Trucks in reply to Sonny Heath, 01-06-2002 07:10:03  
I made my original post here last night with what the shop owner gave me on the telephone. I went to pick it up today and he said that the fan is still doing the same thing that it was doing when I took it to him. He also put a kit in the clutch fan. All together it cost me over $500.00 and it is in the identical condition that it was when I took it there. On the phone last night he said that the heater now works, but that too turned out to be bovine defication. Now he says I should take it to a Western Star dealer 75 miles up the road for them to check as his computer wouldn't read the problem. H E L P Sonny

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JD790

01-07-2002 19:15:03




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 Re: Re: Big Trucks in reply to Sonny, 01-06-2002 20:05:45  
You stated you went to a Shop! Did you go to a Freightliner dealer? Did you ask for a technician to listen to your concerns directly, so nothing would get lost in translation? I happen to know the Ins and outs of your DDEC onboard engine ecm and have worked with them a bunch on International Harvester (Navistar) trucks. I also have many wiring diagrams for those applications. But I assure you unless you find a technician that knows both DDEC 3 controls and Freightliner chassis wiring, your experience at "THE SHOP" will not be pleasant. If you research a shop and feel they don't have anyone that can help you. Go on down the road till you find one. It sounds to me like you have several problems going on and or some one has made you think you have bigger problems than really exsist. Your DDEC engine ECM should control fan operation but needs to know how warm the engine is via a sensor and then it turns on the fan, A/C operation effects the fan operation and overide is a option. This is typical operation But varies with OEM applications. Good Luck!

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VaTom

01-07-2002 04:53:45




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 Re: Re: Big Trucks in reply to Sonny, 01-06-2002 20:05:45  
Translation: He doesn't have a clue what he's doing but want's $500 anyway. Now that you mention it, I could use $500 if you're getting accustomed to throwing it away. And I'll even spare you the bs. This kind of "professional" help is why I started doing what they do, putting on new parts, IF I couldn't figure out what was actually wrong. Parts are a whole lot cheaper. No real advice here, just sympathy.

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Zeus

01-07-2002 11:36:45




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 Re: Re: Re: Big Trucks in reply to VaTom, 01-07-2002 04:53:45  
VA Tom..!! I agree with you 100%!! Most of these so-called "mechanics" or "technicians" are nothing more than "parts hangers" (i.e., they keep taking off old parts and putting new ones on in their place until they finally come to the right one..and, of course, you're charged not only for the unnecessary new parts, but twice as much for the "labor" involved. And, you're right, they're past masters at looking you right in the eye and spouting out their BS! (they think that John Q. Public doesn't have an inkling of what they're talking about). I taught automotive mechanics for 20 years and the one thing I drilled into the student's head was DIAGNOSE and TEST BEFORE replacing any parts. (But I'll bet very few of them heeded this once they started working at a garage, dealership, etc and wanted to "beat the book"!! About the only two classes of people who occupy a lower position than "mechanics" on my totem pole are politicians and criminals.

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JD790

01-07-2002 18:43:48




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 Re: Re: Re: Re: Big Trucks in reply to Zeus, 01-07-2002 11:36:45  
So Zues! what you are saying here is your teachings were totally inaffective during those twenty years and all your students are morons? But you have really nothing helpful to offer this gentleman from your vast experience.



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Zeus

01-08-2002 15:41:42




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 Re: Re: Re: Re: Re: Big Trucks in reply to JD790, 01-07-2002 18:43:48  
JD790,

It is very hard to make any diagnosis when (1) you are not told what types of equipment the truck has (2) exactly what all the symptoms are (3)the correct terminology is not being used (for ex., I believe he means fan switch temp sensor (which would measure temp of air at radiator) and fan relay (instead of fan controller)etc. If this truck is computer-controlled, as most vehicles nowadays are, he will need a good DMM (digital multimeter) to measure resistances and voltages at various points in the system, even if he does tell me exactly what all the symptoms are and when they occur. All the gentleman has relayed to us thus far is what that dinkey shop owner BS'ed to him (pure nonsense). Furthermore, if you are indeed a mechanic, you should know that it is rather hard to diagnose or correct a problem unless you have the actual vehicle there to work on (and even then the solution is sometimes hard to come by). There ARE a few good mechanics out there, but it has been my lifetime experience that they are few and far between. They're either (1) incompetent and can't correct the problem or (2) very competent, but thinking they have the ignorant customer over a barrel, charge him for some major repair when a simple cheap one would have sufficed (eg: replacing a head gasket when merely replacing a stuck-closed thermostat would have corrected the problem; I personally know of a case like this). As to the students: as the old saying goes "you can lead a horse to water, but you sure can't MAKE him drink!!"

Zeus

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cause and effect

01-08-2002 14:27:09




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 Re: Re: Re: Re: Re: Big Trucks in reply to JD790, 01-07-2002 18:43:48  
fact of life- cause and effect,truck has prob-effect-now the cause?- trouble shooting,takes time thought,changin parts is not trouble shootin.
thats the point, open wire, connection,bad ground,will never be fixed by eyes closed, in the dark thinking



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VaTom

01-07-2002 12:42:02




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 Re: Re: Re: Re: Big Trucks in reply to Zeus, 01-07-2002 11:36:45  
Zeus, are you Mr. Staats or Mr. Crow? (Former teachers at CGUHS.) This sure sounds familiar.



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Zeus

01-07-2002 14:33:58




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 Re: Re: Re: Re: Re: Big Trucks in reply to VaTom, 01-07-2002 12:42:02  

Nope. VaTom, I'm neither Mr. Staats nor Mr. Crow; I'm all alone up here on Mount Olympus :<) But I'm glad that some mortals think like me!! :<)



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Sonny Heath

01-08-2002 20:27:28




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 Re: Re: Re: Re: Re: Re: Big Trucks in reply to Zeus, 01-07-2002 14:33:58  
Heeeey Boys,

I didn't mean to start a war. lol Seriously, I have truly enjoyed all the responses. Maybe I can help one of you, in some small way, one day. Heres the rest of the story: I took my truck to the Western Star Dealer about 75 miles up the road yesterday and it took the mechanic about two minutes to spot the problem, 15 or 20 minutes to fix it and then by the time the service manager got around to road testing it (not sure why that was needed, please comment) I wound up paying for an hour and a half which cost me with some terminal connectors, shop supplies, (didn't see any though) and sales tax it cost me $113.00 which I didn't mind paying to get the problem fixed. Matter of fact, I shoved a five spot in the mechanics pocket for a drink. I explained the problem to the mechanic, he picked up his computer meter (sorry if the terminology is improper) walked out to the truck, unscrewed the cap on a receptical, plugged meter in, got no reading, unplugged it, looked up in to receptical, said "Problem with terminal" took out a couple of screws, dropped panel down and saw about five wires pinched in two, put in wire splicers, checked reading, everything fine, watched temp gage start going up, cab getting toasty warm and reported to service manager. The local big truck shop (to my knowledge and belief)didn't try a meter until he had finished the musical chairs with parts replacing, then said I would have to take it to a dealer cause he can't get a reading on his meter. I called him today and told him that I was extremely uncomfortable with how I had been treated and charged and that my wife was urging me to go to small claims court if he wasn't willing to do something to relieve some of the loss. He thought a minute, then said that if I bring it back he will take the new box back out, put my old one back in and also put my old temp sending unit back in and refund the cost of those two parts which will be roughly a hundred and fifty of my $500.00 bux back. Whatayathink I should do? Again, Many Thanks fellers, Sonny

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Tim McCollum

01-08-2002 21:49:01




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 Re: Re: Re: Re: Re: Re: Re: Big Trucks in reply to Sonny Heath, 01-08-2002 20:27:28  
So he refunds $150.00+or- & then hits you for another $350.00 labor? Thats why my 84 is only touched by my hands since new.Being a cross country trucker& diesel mechanic for 32 years,I hear a lot of horror stories about shops & I can tell you truthfully:If a shop can't fix a problem & only relieved the swelling in my wallet there's no way there getting back under my hood! Just get your old parts back for spares & advertise their good deeds on the mens room wall.(not at home though )

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Sonny Heath

01-09-2002 05:37:12




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 Re: Re: Re: Re: Re: Re: Re: Re: Big Trucks in reply to Tim McCollum, 01-08-2002 21:49:01  
Tim,

I think thats some pretty darn good advice. By the time I stop what I'm doing, got my truck out of the barn, drive to the parts changer shop, wait there a couple of hours for them to get ready to swap parts, get my seats greasy again, sand in my floor again, waste more fuel, time and whatever else might happen to retrieve $150.00 probably wouldn't be worth the dadburned trouble, plus letting others in my area know wouldn,t be as effective as if I just pass the word as it stands now. I don't want to keep harping on this but, at the same time, would love to hear what others think they would do if in my shoes. I don't want to unnecessiarily hurt the guy but he has taken up a lot of my time and cost me well over five hundred dollars. Thanks for the response Tim. Sonny

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Zeus

01-09-2002 09:23:21




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Big Trucks in reply to Sonny Heath, 01-09-2002 05:37:12  
Sonny,

Hurt the guy!!! He didn't give a damn about hurting you!! The only way we can put guys like this out of business and keep them from hurting people is to report them to the local Better Business Bureau, the State's Consumer Affairs and/or attorney general, and most of all, tell every trucker you meet about your lousy experience with him! As I stated in my original post: he's a "parts hanger". Furthermore, I wouldn't let him touch my vehicle again; you may get your $150 back, but he'll probably purposely disconnect something else, cut some line, etc in order to wreak revenge on you. My last piece of advice (which another gentleman above also gave you): in all these newer vehicles that are computer-controlled, the first thing you want to do is look for something electrical: loose connections, corroded or loose grounds, frayed wires that have become so by being in contact either with a sharp corner, a moving part, or heat. But be extremely careful about getting around the "brain" (the engine control unit, read "computer") make sure you touch something metal around you in order to discharge any static electricity present in your body (static electricity will zap your computer). Oddly enough, you will usually find (as you did in this case) that your problem is a minor one and will just entail tightening or cleaning a wire connection or replacing a fuse or small section of wiring. Also, as JD790 suggests, get a good wiring diagram of your truck so you'll know where to look. I'm glad that a competent and honest technician got to your truck the second time. If you find one like that, stick with him! because they're hard to find. Good luck.

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Sonny Heath

01-09-2002 21:19:35




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Big Trucks in reply to Zeus, 01-09-2002 09:23:21  
Many thanks for the advice Zeus. It was actually a cheap education. You may rest assured that he will NEVER touch my truck again. I've decided to not go back to him at all except to pick up my old good sending unit that I paid $55.00 for. I don't need it, but its mine and I intend to use it for a paperweight until I need one if I ever do. Sonny



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Greg D.

01-06-2002 17:47:31




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 Re: Big Trucks in reply to Sonny Heath, 01-06-2002 07:10:03  
I would tend to follow the advice about the problems associated with the wires and the DDEC system. While the mechanical gauge will let you know the temp. The DDEC system won`t know whats going on. And the DDEC system needs to kow what is going on as much as you do!!!!! ! I don`t believe you said what model Detroit you had, but I would get with Detoit as well as Freightliner to get to the bottom of this. Good luck!!!!!

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JD790

01-06-2002 16:03:01




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 Re: Big Trucks in reply to Sonny Heath, 01-06-2002 07:10:03  
Sounds like a problem in the wiring. The DDEC 3
on most detroits put in heavy trucks sneds this information to the gauge via a data link. unless the OEM manufacturer mounted a sensor of there own to monitor temperature.
If you could find all the sensors you may see more than 1 temp sensor for coolant temp.
If you disconnect the wrong sensor and put a manual gauge in it could goof up your engine electronics.
If you add a gauge find a spare water port to install it in.

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jd790

01-06-2002 16:25:01




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 Re: Re: Big Trucks in reply to JD790, 01-06-2002 16:03:01  
maybe this will help.



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marlowe

01-06-2002 10:46:17




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 Re: Big Trucks in reply to Sonny Heath, 01-06-2002 07:10:03  
had the same thing with my MF-66 payloader put in a $8.00 MECHANICAL gage and it was just fine 180 deg. with the electric it would show over heat in 10 min.one day the next it would not show any temp. at all



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the tractor vet

01-06-2002 09:57:08




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 Re: Big Trucks in reply to Sonny Heath, 01-06-2002 07:10:03  
Why don't you just replace the electical gauge with a Stwart and Waner machanical one then you will know just what is going on , Always keep im mind that the OLD ways as far as i am conserned is better and alot simpliar.



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Quasimodo

01-06-2002 07:59:59




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 Re: Big Trucks in reply to Sonny Heath, 01-06-2002 07:10:03  
Have you checked your malfunctioning gauge against one known to be operating properly?



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