i'm hoping i can get some help solving some issues with a 2000 fld120 daycab with series 60 ddec iv
1) coolant gauge wont read needle just steps up and then sweeps
2) fan is on all the time
3) no check engine light only shutdown engine light
4) no parking lights when headlights are on
2000 fld120 day cab help
Discussion in 'Freightliner Forum' started by truckerbangin, Jan 19, 2015.
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Fan- fan clutch needs air to disengage, so if you have an air leak or a bad cylonid your fan would stay on.
Or it could be possible your engine is running hot and you don't know it because your temp gage is malfunctioning
Temp gage- gage may be bad or loose wire somewhere.
Parking light issue- is an electrical problem obviously. Could be a bad head light/marker light switch, or a wiring problem.
Hope this helps- but without seeing the tuck it is hard o diagnosetruckerbangin Thanks this. -
#1/#2/#3 all related to bad engine temperature sensor/sensor connector/wiring issue.Rear,upper passenger side of engine.Screws into cylinder head.In your power panel,behind center dash panel,you are going to have a marker light relay that is green and corroded.If you have not,you should pull each relay and replace as needed.You will have more than one that is corroded.Good luck.
truckerbangin Thanks this. -
turned out to be the rely for the parking lights was corroded. change the coolant temp sensor and guage and fan still sweeping.
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check right side harness coming out of ECM.Wires from connector to about 10 inches out tend to rub and wear insulation.Probably will have to cut open harness loom to check.Good luck.P.S. don't forget to check every relay for corrosion.You will have more than one.
truckerbangin Thanks this.
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