93 Overheating

Have you confirmed that the electric fan is working?

When you speed up so that there's enough air going across the rad to cool the car, does the temp drop?

You haven't provided enough info for us to rule some things out. If it heats up in traffic, and cools down on the road -- there's almost certainly something wrong with the fan. If it heats up quickly no matter what you do, my guess is that the t'stat has stopped opening.

What kind of fan is on the car? When you drive it, do you flip the fan on and leave it on all the time? Many of the $79 Speed Shop specials don't have enough capacity to keep a 5.0L cool. Of course that depends on accessories, where you live (climate), how you drive (stop and go vs. cruising), etc.

In any event -- diagnosing a problem like this is easier if you have a real temp gauge -- the stockers aren't the most accurate or reliable. If you crank it up, and it gradually heats up and goes right past the t'stat temp, then the t'stat's probably stuck closed. You can usually tell this because the engine will heat up, but the upper radiator hose stays relatively cool -- because virtually no heated coolant can flow through it when the t'stat is stuck.

Sounds to me like you might not have enough fan. I run a SPAL fully shrouded dual 11" unit and it's controlled with a Delta Current Control variable speed controller.

I'd strongly suggest you look at another way to control the fan. One of the real benefits of an electric is that it DOESN'T need to run all the time -- but only if you have it set up to sense temps and come on/off automatically.

Go to www.dccontrol.com --- absolutely the best fan controller out there. The Mark VIII fans, Taurus 3.8L fans and SN95 fans are some of the most popular conversions -- all have enough capacity to cool the car. And all will likely overwhelm your stock 65A alternator. I upgraded to a 130A on mine.

Here's some info/pics on the variable speed controller on mine: http://www.etnracing.com/pages/Tech/FanControl.htm