"Daniel who wants to know" > wrote in message
...
>
> They aren't relays at all, the rad fan on 3rd generation Chrysler vans are
> all variable speed and what they call a "relay" is actually an electronic
> PWM motor speed controller with a big power MOSFET in it. If it is
> overheating the fan is likely overamping or the "relay" might need to be
> bolted to something that is better at getting rid of heat, like an old
> computer CPU heatsink.
>

I just looked on fleabay and noticed that the ones for the 4th gen vans have
a PGA (pin grid array) heatsink on the back, kind of like, you guessed it, a
CPU (processor) cooler heatsink. It would appear Chrysler learned something
and quietly made a change.