I had an 87 GN. when I would park the car hot the cooling fan would come on. Had to sell the car. I now have an 86 GN. When I park the car hot the fan does not come on. The fan will come on when the car is running. Do I have a problem?
I would like to know too. My fans do not run after I shut down... never did. Then again, i don't think I have high speed either. :-)
Dean
It's rare when the delay relay kicks in the fan on shut down. It's controled by a single wire sensor located on the drivers side, center of intake plemum. The switch is set at 95 C. The high and low speeds are controled by the ECM. If you want to check it just unplug the sensor and ground it.
The situation that causes the fan to come on after shut down is called "Heat soak." While the engine is running, the relatively cool air rushing through the plenum cools the plenum/manifold. Then when you shut down, the heat migrates from the hot heads to the intake through the intake bolts, and gaskets. When the heat is excessive, the fan comes on to cool the engine, sometimes five minutes after you have shut off the key. Many of you never experience after-cooling because you run a 150* thermostat and the engine rarely gets hot enough so that heat soak can't raise the temp sufficiently to cause the fan to come on.
On a nice hot day in the deep south, in stop and go traffic on the Xway where the temp is probably 120* on the pavement, a 190* stat will cause your fans to cycle constantly. It's also certain that your fan will run for awhile after shut-down.
The most important point we need to make here is your fan can come on unexpectedly after shut-down. There is a strong possibility of injury, so ALWAYS, before doing anything under the hood, allow the engine to cool down to the point where you can lay your hand on any part of the engine and keep it there. That's about 135*F.
One of your relays might be bad also. You should be able to run a wire from the back of the alternator to one of the wires going into the relay to see if it works. Or I guess you could get the engine warm enough so the low speed turns on, then shut the car off and put a different relay in its spot and restart the car. My low speed relay sounded like a rattle, I opened it up and all the pieces fell out. Good luck.