picklebill Posted September 12, 2017 Share Posted September 12, 2017 I am in the process of rebuilding the cooling system in my 1982 Sunrader. The fan clutch, when cold, has a small amount of coupling resistance between the shaft and the fan, but when I heat the clutch assemble up with a heat gun (very hot), the shaft resistance does not increase very much. When very hot should the shaft lock to the fan assembly, or at least should the coupling between the two be very stiff? I hate to spent the money for a new one if it is not needed. Thanks for any info, Bill Quote Link to comment Share on other sites More sharing options...
DanAatTheCape Posted October 2, 2017 Share Posted October 2, 2017 I think centrifugal force is part of the equation - I would run it and see how it does. IT is fairly easy to change on the vehicle later if neccessary Quote Link to comment Share on other sites More sharing options...
sls4ak Posted October 2, 2017 Share Posted October 2, 2017 If your engine was overheating, the fan clutch is the cheapest and most likely culprit, my pickup truck (2003 Silverado 2500 257k miles) would only overheat when pulling my boat all test looked like fan was fine, changed it anyway, problem solved. The testing didn't show the fine line between OK and good enough. Quote Link to comment Share on other sites More sharing options...
picklebill Posted October 5, 2017 Author Share Posted October 5, 2017 thanks to you both for the info. I went ahead and changed it since I had changed the thermostat, radiator, radiator cap and hoses. All is well now. Bill Quote Link to comment Share on other sites More sharing options...
Maineah Posted October 5, 2017 Share Posted October 5, 2017 Does it make more noise at speed when the engine is warm? none of them completely lockup some may go as high as 90% but I think the Toy home ones are more in the 70% range. Heating it only opens the valve that controls the fluid flow inside so without a good rotational speed it won't be obvious. Quote Link to comment Share on other sites More sharing options...
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