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Update: Replaced the actuator a couple of weeks ago and air is ice cold. No over heating and I can hear the difference in fan speeds when the air is on.

Thanks oddball, the simple test I was looking for, now to find an actuator.

Still over heating without much change. I'm down to two possible causes, the hydraulic fan or the thermostat. Is there any way to tell if the fan is not kicking into high?

Checked out post #2 and checked fluid level in reservoir which was low by about an inch below min level. Another question; owner manual says "Mercon" and specifically not to mix "mercon" and "Mercon V". I have a quart of Mercon V that says it replaced "Mercon" - leave it to automotive engineers...

I lurk and glean plenty of good info without having to post superfluous redundant info. Ive fixed the ball joints wheel bearings and plenty of other things thanks to the support on this forum. This problem is a real pain that I need some help with. Just to rant, the design of the cooling system...

Curt, your symptoms sound similar to mine. I've checked the coolant levels - good. l Last month I replaced the DCCV as I determined that was the culprit but is is still happening. I'm leaning toward the fan. My LS is a 2002 so its hydraulic. I do see it turning and it seems to moving a good...