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I'm using the black boot (standard ) sender with the standard gauge. Just finished another test. Fan turned on about 230-235. Stayed on 50 seconds. Temp didn't come down at all on the gauge. Shut the engine off and then restarted immediately. Temp was 215. How can it go down with the...

Spare gauge...Haven't tried this one yet. Sending unit is new and black. Replaced it yesterday

Current gauge

I've checked the cap, it went to about 15psi before releasing. Would having the cap off have any bearing on the actual cooling? My understanding is that the pressure only raises the boiling point of the liquid.

I'll check when back home tonight. The one that's in there is just a new "normal" style one. I have an LED laying around. I'll post a photo of both of them in a few hours.

I thought it's only the newest (LED indicator) gauge that requires the Grey boot sensor. This is the standard gauge. Maybe because it's new, it may require the new sensor. I have a new LED indicator gauge, I'll slip that in and see if it changes anything. If the pure water coolant (no...

1993 m998 with a rebuild in '07. Engine is a GEP 6.5. Temp shows 240 (after a proper warm up.) Fan comes on. Less than a minute later, the fan shuts off. Then about 2 minutes or 3 minutes later, the fan comes on again. Tsu for fan seems to be sensing the heat and also the cooldown from...