Over heating or no?

I just recently replaced the thermostat in my 1.5 diesel engine. It's now running at 200°f is that to high? There something else wrong? Maybe it wasn't burped all the way?

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Not Burping of filling it properly, that is you fill the radiator from the top hose, then reverse the hose and fill the block, then run it with the res cap off and burp it is one way.

There is also the method that you drill a 1/8 to 1/16 hole in the lip of the t-stat to allow air to escape as you fill it to prevent the bubble.


The other point is which t-stat did you install, most common is 195F or 95C t-stats, and they will show warmer than you are used to if a lower t-stat as in 180F was installed prior. (Some manufacturers stamp the degree on the t-stat.) Also it is a good practice to boil the t-stat on a store to be sure that it opens fully prior to install, I have had ones bad out of the box.

The point of the matter is this, as your car is motivating down the highway the needle of your water gauge should be centered or slightly right of center.  As you stop the temp may climb to 3/4 and the fan kick on. Which is NORMAL.

While you are sitting in the drive running the engine after a change of part, your engine isn't getting the airflow over the radiator, and the temperature of the engine will be hotter than in motion, but once the fan kicks on the needle will be driven back to center.

So when this is happening, were the needle is in respect to center, and the temp of the t-stat are what we need to know.

On a side note, it is a good thing to flush and back flush your cooling system every couple of years,  I usually do the heater core separately as the flush and black flush go so that the calcification and stuff is kept to a minimum.

 

My gauge is reading 3/4 all the time - not sure if the engine is hot or the gauge is wrong
Anyone know the resistance of the sender @ operating temp