[clf]

Originally Posted by 75driver

The latest auto diesel was only getting up to 70 deg, so installed a specialist components housing and an 88 deg stat from motaquip, FTS104.88 / VTK169, in the top hose.
From cold, and monitoring temperature via obd, it initially reaches 98 deg, before dropping.
After initial cycle, it generally reaches 93-95 before dropping.
Also, if it was steady state at say 89, and I put some load on the engine (going up a hill), I’ve seen it go to 98, and expect it would go higher on a longer hill.
But, I have also noticed it dropping after 91 has been maintained for say 2 minutes.
This makes me think that the stat opens very slowly.
I know the slow speed fan kicks in at 100, but what is the consensus on running at these temperatures on a diesel?
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As it sits, I wouldnt be overly concerned. But I would keep an eye on it in case it is a faulty stat. More because it is new. If it maintained this function consistently, I would then I would not be concerned. Remember, BMW struggled with getting the temperature up to high 80's. Any I have had fitted (just in the hose) has always displayed 1 or 2 degrees less than the rating of the stat fitted - coming to the conclusion that there is a 1-2 degree discrepancy between the standard location, and the location in the top hose. I would question if it was an 88 degree stat. and not perhaps a 92-94. I did try to find a 92 in hose stat for my car (which I was hoping to get 90 degrees from), but they were silly money, and coming from eastern europe, so settled on the 89.