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rickf · 08-11-2008, 12:45 PM

200 degrees is not particularly hot. For the truck sitting in hot sun idling for a long time, that's actually pretty good. In that situation you've got minimal air flow through the rad, engine is running slow, so the fan is too.

I'm not sure what stock thermostat is for the L6, but on a 71 gmc 350 it is 192. Getting to 200 would be well within normal operating range.

If you have 50/50 antifreeze/water, then boiling point is something like 250 degrees.

You could get to 210 and still be considered normal, though the hot side of normal. At around 220 it is time to start worrying, if you get to 230 shut it off, especially if it is still climbing.

But at 200, especially if it gets to 200 and stays at 200 no matter how long it sits running, you should be pleased.

08-11-2008, 12:45 PM	#2
rickf Registered User Join Date: Dec 2005 Location: Lake Oswego, OR Posts: 318	Re: 65 6 cycl running hot 200 degrees is not particularly hot. For the truck sitting in hot sun idling for a long time, that's actually pretty good. In that situation you've got minimal air flow through the rad, engine is running slow, so the fan is too. I'm not sure what stock thermostat is for the L6, but on a 71 gmc 350 it is 192. Getting to 200 would be well within normal operating range. If you have 50/50 antifreeze/water, then boiling point is something like 250 degrees. You could get to 210 and still be considered normal, though the hot side of normal. At around 220 it is time to start worrying, if you get to 230 shut it off, especially if it is still climbing. But at 200, especially if it gets to 200 and stays at 200 no matter how long it sits running, you should be pleased.