Posted by rexhellwig on May 15, 2011 at 18:55:52 from (138.210.244.4):
In Reply to: Re: viscous fan drive posted by Bob Bancroft on May 15, 2011 at 18:31:11:
There is nothing fancy about this fan drive. The radiator fins in front of the drive must be clean so that heat from the radiator can impinge onto the heat sensor on the front of the drive. This will make the drive spin a little faster - IF the fluid hasn't leaked out.
The next time you shut down the engine while it is hot, see if the fan wants to spin for a few seconds longer. If it does, this might mean the fan drive has seen its better days.
With the engine cold, drain down a couple gallons of coolant and remove the upper hose from the radiator. Take a look inside with a good light. Is there white looking junk built up on the tubes restricting flow through the core?
Maybe you're luckier. Maybe the gauge simply isn't reading right.
Before you go modifying this or that, remember: It did not always "run hot".
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