Quote:
Originally Posted by Meestahbig
I am getting confused, viscous fan, engine fan and electric fan? I am talking about the giant fan directly in front of the radiator, the one I have to take the blades off and remove the housing to work on things. I think this is the viscous fan/clutch.
My current guess, is that this is going. Rationale is its blowing weak, so if it blows weak cool air, things are stable, if its blowing weak hot air, then the coolant starts to overheat. Or the t-stat is restricting flow and again the warm air is just not sufficient with the weaker.
I'' get to work and report back with the solution.
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The viscous fan clutch is the center part of the spinning fan with blades. As the temp increases the fan spins at a higher rate as the viscous materials tightens the hub. When you first start the car cold the fan sort of lopes along, once the temp rises the clutch “ bites” more and the fan spins higher pulling more air over the radiator and increasing the cooling effect.
These thing fail so that if it doesn’t tighten enough the fan doesn’t spin fast enough. Usually in bumper to bumper traffic. But, never seen one fail to the extent you would get a quick over heat.
To test carefully stick a bit of rolled up newspaper in the fan after its at op temp. Ease it in. If the newspaper causes the fan to stop or even slow significantly the clutch is bad.
Safer way is with the engine hot but off try to spin the fan by hand. If the fan spins then the clutch is bad. If it resists, not your problem.
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