Temp
 

my radiator temp keeps going from 190 to 200 when im driving, i checked my radiator its filled my, coolant tank is topped off so, i bought a new radiator cap. i dont see any leakes on the driveway, so what gives:argh::argh:why is my temp constanly going from 190-200 and then back down to 190?:argh::argh:

Mine also dances there when it's below freezing with no cover on the grill. I'm thinking it's just barely warm enough to open the thermostat.

its 68 degrees here, its like low 40deg in the mrning and low 70deg at midday, but the temp keeps going up down 190-200 range.

My truck did that for a little bit when I changed out my water pump but it's actin normal now... Did you do anything to your cooling system lately? Maybe it has an air pocket in it somewhere

mine just started doing that to and i didn't touch the cooling system it was about 55 degrees when it started just last weekend but wasn't doing it at all when it was real cold

It never warme dup enough when it ws cold to open the thermostat so they gauge never moves.

A 10 degree swing in the gauage is normal at any time. Remeber these gauges are just dummies responding to what the ECU says to set them at. It ha sits own notions of what the readings should be at any given time. Unless it quits working or consistently goes over 240 its normal.

i did nothing to the cooling system, it started getting warm out now my temp gauge has a 10 degree swing, it just not normal to me. this truck is my first diesel and id rather be safe than sorry.:humm:

Mine is alittle floppy too. I usually get parts from Cummins south. The thermostat I bought last was AAP. It is crap, I wouldnt worry to much. Get another thermostat if it is jumpy

:dang: floppy gauge

It's the thermostat opening and closing, totally normal.

Not always...there was a issue at one time called "tick-tocking" where the temperature would bounce up and down, and it was caused by a faulty/failing thermostat.

I know what they are talking about as I had a truck do this. Normally, I see a swing of three degrees and that doesn't even register on the in-dash guage. On one that is tick-tocking, you will see a 10 to 15 degree swing, and it does register on the in-dash guage. A new thermostat (from Cummins) fixed my problem.

Well my 12v did this from day one and still did it when i sold it @475k with stock thermostat, my 05 does it when it gets hot out and since the temp probe in right next to the thermostat it just makes sence for the temps to flucituate while it's opening and closing. JMO
http://i249.photobucket.com/albums/g...oled05/003.jpg

Just because it did it, doesn't mean it was right...

Well when the therm. is shut the temp is gonna go up and when it opens its gonna go down, right? w/ the temp sender right there its gonna have a change in temp when it opens and shuts,pretty simple. If you dont belive me put a new thermostat in and put a mechanical guage in and tell me the outcome.

I have a mechanical guage, and a thermostat should open/close smoothly, not "jerky"...already been down this road. Have seen several trucks this way, and its always been the thermostat.

A fluctuation of a couple degrees is normal, a fluctuation of ten plus degrees is NOT normal. A fluctuation of a couple degrees WILL NOT REGISTER on the factory guage, however; ten plus degrees will.

:humm:so my thermostat may need to be change, i currently have a fluctuation of about 10 degrees