[thstone]

I track my car extensively and an seriously looking at installing an underdrive pulley but I have two concerns and would like some feedback. Both questions are a result of the 100F+ temps that we've been having here in SoCal recently;

1. Engine Cooling - Does the UD pulley have any noticeable effect on engine temps (since the water pump isn't turning as fast as normal)?

2. Air Conditioning - Does the UD pulley have any noticeable effect on A/C cooling (since the A/C compressor isn't turning as fast as normal)?

Thanks to all.