parttimefarmer
Active Member
when driving at high speed over 2000 RPM like 2300 RPM the temp gauge goes to the high end of gauge range; if driving at 2000 RPM it stays in center of gauge.
even with no load on truck at 60 MPH on blacktop the temp gauge goes to high end that is at 2300 RPM; if at 55 MPH on blacktop at 2000 RPM it goes to center of gauge or little bit above center of gauge.
If with a load on and traveling on gravel road slow speed 10 to 15 MPH and going over 2000 RPM up to 2300 RPM the temp gauge goes high end of range, but if I keep the RPM under 2000 the temp gauge stays in the center.
Any ideas what is happening did not do this until recently.
engine is Ford 7.8 litter diesel 225 HP at 2300 RPM. Truck Ford F900 year 1982. miles 260,481.
More then likely has original engine temp gauge in coolant system.
even with no load on truck at 60 MPH on blacktop the temp gauge goes to high end that is at 2300 RPM; if at 55 MPH on blacktop at 2000 RPM it goes to center of gauge or little bit above center of gauge.
If with a load on and traveling on gravel road slow speed 10 to 15 MPH and going over 2000 RPM up to 2300 RPM the temp gauge goes high end of range, but if I keep the RPM under 2000 the temp gauge stays in the center.
Any ideas what is happening did not do this until recently.
engine is Ford 7.8 litter diesel 225 HP at 2300 RPM. Truck Ford F900 year 1982. miles 260,481.
More then likely has original engine temp gauge in coolant system.