Rad Fan Booster

[Mitch Loescher <Loescher@tamu.edu>]

I made a minor modification I thought I'd share...

I noticed that my '87 5000SQ rad fan has 3 speeds...low, mediun, and
hurricane. When I start the car with the a/c on, it goes on to low.  As the
a/c discharge pressure gets high, it goes to medium.  The problem is...the
high setting is not triggered until the radiator starts overheating.  

I found that the a/c would cool off dramatically when I was moving versus
when I was in traffic.  This is regardless of whether I held a bit (like
1500 RPM) of throttle on.  I figured it was the condensor limiting the
system.  So I loacted the relay that engages high and installed a switch
that engages the relay.  I have noticed that it does help on idle in traffic
a bit.  It also helps when the car had been sitting for a couple hours and
the condensor has soaked the heat of the radiator...i.e. it cools down much
faster if I put it on high for about a minute or two after starting it.  I
don't run it like this all the time, just when there's low airflow and the
air is 95+F which we've had alot of lately.  I let you know if I destroy the
fan by running it on high more than normal.

 - Mitch