Captain Zeros

The fan will move about 1/3 of a turn when the car is off and cold. When the car is hot and off it will maybe move a blade or two over before stopping. Wouldn't say it was "seized" but its pretty hard to move. I didn't drain the system recently but I could have a bubble in there from the heater core maybe, it has a small leak which could cause air to enter I guess.

Thanks

Jan

If air is entering the system it will get hot.

But that would have showed itself during the pressure test if you had the heater core "open". I think. Now I'm second guessing myself. Long day at work. But I do know for a fact that "air" in the system will make it run hotter.

Edited August 12, 201313 yr by rcb280z

I had the heater closed. I'll keep you guys updated.

Aren't the clutches filled with grease or some type of oil? If it spins less freely when it's hot it's doing the opposite of what it is supposed to do, right?

I knew I'd read this Tech Tip for the fan clutch but had trouble remembering the wording of the site, not atlanticz.com.

240z 260z 280z 280zx Datsun Fan Clutch Rebuild

Edited August 15, 201313 yr by siteunseen

Aren't the clutches filled with grease or some type of oil? If it spins less freely when it's hot it's doing the opposite of what it is supposed to do, right?

It's a little more complicated than that. It is a fluid coupling that is designed to slip when cold, and then stiffen up when hot, but still allows some slip so it doesn't spin at 7000 RPM and explode when you pin the throttle.