Wiring Fan Override in SPF

MidOHasp · #1 (**permalink**) 05-21-2004, 08:56 AM

I am looking for the procedure to install a fan override switch in my SPF 1670. Every now and then, the needle is going over 100 and it always happens when I'm running hard and then get stuck in traffic or something. My thoughts are that I'm getting some heat built up, but while I'm at speed, it has no problem keeping up. Then, when I stop, the fans just aren't kicking in early enough to keep the temp down.

Sitting at an idle in the driveway, over the course of 10-15 minutes, the water will get right to 90 and the fans will cycle on and off normally. After hard driving, the temp will start climbing slowly as I'm standing still, but the fans won't always kick right on at 90. Maybe 94 or 98. My thought is that the water is getting hot in the motor and as it passes over the sending unit in the intake manifold, it's showing me that it's getting hot. But by the time water gets to the radiator (takes longer in my car than in most due to some creative custom plumbing), it's been a while, and the water that is NOW getting to the sending unit is REALLY hot. By the time the fans kick on, there's water in the system that is much hotter than it should be, and even with the fans, it has a hard time cooling off a slow rolling boil.

My thinking is that if I hide an override switch, and I'm running hard, I can flip it on as I slow down or get stuck in a parade. It will keep the water about where it should be.

So 2 things...

1) Is my logic somewhat sound? Does my explanation sound like a reasonable one for why I'm having the problem?
2) How do I wire the override on a newer SPF? I want to keep the thermostatic control on them, as well. Seems like a fair number of you have done this.

Thanks, in advance, as always, for all your help.

PS - for those of you following my overheating woes of last summer/fall, this is not that.

Thank God. This is nice gradual minor overheating. A welcome change from where I was almost a year ago.

PPS - running a 160 stat, will be switching to 180. Since all of my woes happen after 160, my thoughts are that 180 being the so-called "right choice" will not exacerbate my problem.