Engine revving noise

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I got the fan clutch replaced a couple of weeks ago. Ever since then the engine likes to revv louder then before. Do the two have anything to do with each other? Should I worry about it? It doesn't always do it and when it does it is only when going from 0 to 15 mph. Please let me know your thoughts.

jonlotz4 in Independence MO

Aug 29, 2011

2 Replies

Popular Answer

user91328on Aug 29, 2011

being as the fan clutch was bad, i assume, it is now working and will roar when operating till it is not needed. it may be normal but get the shop that installed it to verify. Roy

Sci-Techon Sep 1, 2011

The fan clutch is thermostatically controlled. When the air coming off the radiator gets hot enough, a bi-metallic spring unwinds and closes an internal valve inside the fan clutch. This prevents the fluid inside the clutch from moving between internal chambers inside the unit. When that happens the fan clutch stops freewheeling and locks up which drives more air. If the vehicle is stationary this can cause a roaring noise on acceleration. If the noise is present when the radiator is cold, there is a problem with the fan clutch.

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