When I did the 383 swap a week ago I found a problem with the secondary fan switch electrical connection. The sensor, which mounts in the passenger side head/block junction area, and is VERY close to the headers on the harness end where the wires come out of the connector. So close, I cannot see how to get the electrical connector onto the sensor without dropping the headers off the passenger side. Looking closer at the connector, it show evidence of getting really hot in the past even with the factory exhaust manifolds (it's all discolored and looks brittle, but not quite hot enough to have melted any).

This connector is not the button-ended kind like is on the other side of the engine that drives the temperature guage. This connector has the rounded pin type connector that requires a male connector on the harness to plug into it (and sticks out a lot farther than the button ended type). There is also a splice in the harness where it looks like this connector has been replaced at least once in the past.

It is my understanding that this sensor's only function is to control when the second electric fan kicks on. That appears true as well since so far all I've seen running is one of the two factory electric fans.

So what are my options? It gets hot enough in Dallas, TX, that I know I'm going to need that second fan running before too much longer.

1. Do the 91 Formula's normally use this type of sensor, or did someone swap to this style in the past?
2. Can a button-ended type sensor be substituted for the plug-in type and still work properly?
3. Should I consider splicing the second fan into the primary fan's circuit so that any time the primary comes on the secondary doea as well?
4. If I do option #3, how would I go about doing this?

Sure hope someone can give me a hand on this....

Have a Great Day!!!

- Vern