You might check to be sure the lower radiator hose isn't collapsing from
time to time. Have the radiator cap checked to be sure it holds correct
pressure. Then consider replacing thermostat. Could also be faulty
coolant temp sensor.
RayB
http://www.dragtruk.com/ENTRIES/20KM1FD2KWBP.html
> -----Original Message-----
> '88 Dakota, V6, 3.9L, auto, 2WD. While driving at highway
> speeds, the temperature
> fluctuates quite noticeably. I don't have any measurements in
> degrees since my gauge is
> only a L/H with a needle somewhere in the middle. But, the
> optimal temp in the past has
> always been just a bit past 1/3 of the way from Low to High on
> the gauge. Now, while
> driving at 55-65, it will sit at optimal for a while, then climb
> to a bit past the halfway
> mark on the gauge, sit there for a while, and then fall back
> down. These temp changes do
> not seem to be related to anything like uphill/downill driving or
> anything like that. I
> don't tow anything. Just drive back and forth from work
> basically. 20 minute drive,
> mainly 60mph. Coolant levels all seem to be in order. Drive
> belts are all tight. Are we
> looking at a bad thermostat here? Don't they usually either
> stick open or closed?
>
> Any thoughts would be appreciated.
>
> Thanks,
>
> Josh Moran
>
>
This archive was generated by hypermail 2b29 : Fri Feb 06 2004 - 11:46:13 EST