that usually is a sign that the radiator is low on water.
But you said you filled it with water, so i am not sure . make sure there
are no air pockets trapped in the engine/radiator.
You wrote on Thu, 17 May 2007 19:35:03 -0500:
T> I noticed that the coolant level in my radiator rises and falls very
T> rhythmically. It seems to be very consistent in it's tidal movements and
T> appears to coincide with a fluctuating temp gauge.
T> This problem (?) first appeared when I had the heater hose fitting on
T> the intake manifold replaced due to corrosion (damn thing fell off!). I
T> tried bleeding any air out of the cooling system and replaced the
T> thermostat, but it didn't help. That's when I noticed the radiator tidal
T> action. The truck (95 K1500 5.7L auto with trans cooler) doesn't
T> overheat. I've never had a vehicle with a constantly moving temp gauge.
T> It goes up and down between 1/4 (guessing 160deg.) and 1/2 (210). When
T> first warmed up, it spikes at something slightly over 210 and then drops
T> down and up and down and.....
T> With the summer heat soon upon us and increased towing (boat), I'm
T> afraid it may overheat or worse.
T> Otherwise, the truck seems to run fine. Thoughts? TIA
With best regards, email@example.com. E-mail: firstname.lastname@example.org