No need to apologize my feelings were not hurt. I am from Oklahoma so I have thick skin.

There is no doubt that the OEM mechanical fan can move much more air than the Procomp electric. That is true when the engine is at intermediate RPMs and at the cost of probably 25 hp and when the fan clutch is fully engaged.

The OEM A/C electric fan is intended to provide minimal air flow for the A/C condenser when the engine is at idle or the vehicle is moving at low speed. The new electric fan provides more than ample air flow ( 2750 cu-ft/sec ) at any speed.

After I did my installation I descovered that the engine had a hard time staying a operating tempature because the new fan was running at 50% when the engine reached 160 F. I descovered I had a theromastat that was failing but the stock cooling system did not provide enough air-flow at low speed to discover this problem.

The new electric fan set up almost always runs at the 50% level because it provides enough air flow to cool the engine at idle and slow speed even in hot weather, the two exceptions are:

1. When the A/C is switched on the fan runs at 100%

2. If the engine tempature reaches 200 F the fan will switch to 100% this usually happens only when the engine is shut off and I have the ACCY switch on.

If you want a verifiable test, insert a therometer in the A/C duct and let it idle for 15 mins with the stock setup and then do the same test with the new electric fan only. Just make sure the Outside Temp. is coose to the same in both test and that the new fan is running at full speed.