Coolant Temperature 912UL

Do NOT go adding aftermarket additives to the Coolant.

I do not necessarily follow the book to the letter, but that would be taking it too far.

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If this doesn't work, you will need to take it back apart and do it again.

Yeah! I know, It Sucks!  Otherwise, try this...

Try to identify EXACTLY where the leak is.

Drain the coolant from the system.

Redneck a ShopVac to the Coolant cap fitting to form a vacuum on the system.

Dribble some Denatured Alcohol or Brake Cleaner on the leak until you see it get sucked into the leak.

That should clean out the leak for the next step.

Allow the Vac to run another couple of minutes to dry the leak.

Place a drop of Locktite on the spot and as soon as you see it get sucked in shut OFF the VAc.

Add another drop to the spot for good measure.  It should wick itself into the leak.

Now, let it sit overnight before refilling.

If that doesn't work, you will need to do it the hard, but the correct, way.

Good luck!

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Second Answer...

It this with the engine Running or Stopped???

The Oil and Coolant temps should be fairly close.  90 and 190 are NOT close.

90 would be a typical under-cowl temp on an 81-degree day.

190 would be a typical temp for a running engine on any day.

Can you clarify the actual conditions?

90C = 194F

You are probably indicating C on your coolant readout.