I recently had a great little go around with my cooling system after it my 99 XJ Sport overheated. I ended up completely replacing the radiator, t-stat, t-stat housing, electric fan, and some hoses.
I don't know if this is a huge problem or not, but my temp fluctuates between 210* and back down to the immediately lower hash-mark.
My assumption is that the new radiator is doing its job really well and bringing my 50/50 mix down to a nice, low temp.
But... when I let it idle for a little while, the temp goes up to around half-way past the 210* hash mark. The electric fan takes care of it and keeps it there, but I'm a little concerned that this is happening in the deal middle of a cold winter. I don't want to leave it alone and then end up overheating again come spring.
If anyone has any thoughts on this, I'd love to hear em!
The temperature should stay steady in a very narrow range of 190*-210* with very little fluctuation. You description of the symptoms is a little vague, what temp is a "hash mark" ? Can you estimate your temperature fluctuations ? Do you have full dashboard gauges or just idiot lights.
You should buy or borrow an Infrared Temperature Scanner and confirm you engine temps by testing at the thermostat housing.
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