As Mark indicates, having power at the fan is only part of the
circuit. It's the ground connection that is important. If there a poor
ground connection no electricity will flow.

On Aug 30, 2009, at 1:19 PM, Dave Mcneely wrote:

> In the continuing saga of my '91 camper cooling matters:
>
> I reported earlier that I was getting a new radiator, and that I hoped
> this would resolve the cooling, keep the temp gage needle more
> nearly on
> the warning led.  this is after the replacement of the radiator
> temperature switch by one that clicks on at slightly lower
> temperatures
> for both speeds.
>
> So, I took the van to a radiator shop, where the tech said he thought
> the radiator needed cleaning (rodded out), rather than replaced.
> however, we discovered that it had some pinhole leaks, and so replaced
> it with a new Behr radiator.
>
> But, the tech then called me, and said he could not get the fan to
> come
> on.  The fan was working, both low and high speeds, when I took it to
> him.  He now claims that he doesn't know if it was working, but that
> there is power to the fan motor, and the fan won't come on.  he claims
> that there is no point in doing any further checks, that there
> definitely is power, and that the fan definitely does not work.
>
> I am at a loss as to why a perfectly operable fan would just stop with
> no warning when disconnected and reconnected.  I tried to get him to
> run
> through jumping the temp switch.  He just thinks I'm nuts.
>
> The fan has factory air conditioning, and he says the fan won't
> operate
> with the air conditioning on (should be full time then), nor will it
> operate when the van is warmed to the led position on the gage, though
> he can show power to the fan motor.  He says the only thing to do is
> replace the fan motor or fan assembly.
>
> What to do?  I think he has it connected improperly some way, but I
> can't seem to get him to consider that possibility.   Or, the leads
> and
> contacts may just be old and need cleaning -- sometimes when contacts
> are disconnected, they are put back together with dirty sides touching
> and therefore not making good contact.  Can't get him even to consider
> that.
>
> There are only two wires to the motor as he has it wired, and I
> believe
> there should be four (one for each of the two speeds, one separate
> from
> the air conditioner, and ground).  Is this incorrect?
>
> David McNeely