It sounds like the brushes inside of the fan are not making proper contact. I have the same exact problem on my car with the same exact fan. After almost 20 years though, it's something I would almost expect. Symptoms will include intermidant fan operation and slower fan speed. Try this test: 1. Verify that all wire connections are secure and are getting proper power. Fan motor electrical plug, and the fan fail bypass if installed. Also check the fuses on the fail fail bypass. 2. Remove the brake master cylinder access panel. 3. Turn the key to "ON" position, and the A/C controls to the on position (leave both the engine and the blower fan off). 4. If you feel brave enough you can tap the fan blades with your hand. But to be safe, rapp the side of the motor housing with something like a wrench. If the brushes are bad, most time the fan will start to spin. If not, make sure that you check ALL electrical connections. Once the fan is at full speed, you WILL feel a good amount of air displaced from the fan. Once the fans are plugged in, they won't cool the engine instantly, but it will be pretty quick. Your cooling system may also vary depending upon individual factors: Condition/mixture of coolant, amount of air in the system, pump, thermostat, and type of radiator installed (I run the heavy duty brass one). You can also do this test laying on the ground, but untill you used to it, the danger of sticking a finger into the path of the blades is just too great. An overhead view is best. On a side note, I run neither FanZilla?, nor the Fan Fix® and my car is just fine. I'm not knocking either product, I just have other items on the car that require more attention at the moment. -Robert vin 6585 --- In dmcnews@xxxx, "Jim" <ultra@xxxx> wrote: <SNIP> >one fan kicked > in on its own, and while I do admit it didn't cool down the engine > real fast, it DEFINATELY kept it from heating any hotter. <SNIP>