2.8l V6 AHA Engine Differences

[Pbadore at aol.com]

I am currently doing an AHA engine swap between a late 99 A4 AHA to a 98 A4 
AHA.
So far I have found that the 99 AHA uses an electronic cooling fan control 
module which the 98 does not. The 98 AHA has a simpler 2 post fan resistor.   
The 99 AHA has an electric coolant pump mounted between the thermostat cover 
small diameter nipple and the horizontal cooling pipe instead of a one piece 
coolant hose on the 98 AHA. The 99 engine has an added coolant temperature switch 
and different a connector for the electric radiator fan. These changes may not 
be applicable to the A6 as earlier A6 cars use ddual electric radiator fans 
and the A4 had one mechanical drive fan. My swap is just at the point of 
removing the 98 AHA engine with the 99 engine already out of the crashed A4.       



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