well the past 2 days my temperature gage has been going from half to
3/4 then dropping back to normal... i thought was my thermostate
changed it last night... its still jumping in temperature i check my
anit freez was a lil low but noticed a almost goop/sludge.. im not
blowing smoke or dont seem to be burning anything no leaks so im
wondering either do i have a bad head gasket or should i flush the
system??? please any suggestions would help   thank you