Here is how I test them:
Take a drive down the highway.  Watch the needle on the temp gauge.  Wait
for the van to fully warm up.  Once the van is warmed up, turn on the front
heater and the fan for it full blast.  Watch your gauge needle.  If the van
was running extra warm or hot and now it cools down to about middle, it
means that your radiator is clogged on the inside and you need a new
radiator.  The front heater core is acting as a mini radiator, and cooling
the van down.  The solution is to buy a new radiator and you should be good
to go for many years to come.

Hope this helps, and if you want to buy a radiator from us to say thanks, I
would appreciate that :-)

Ken Wilford
John 3:16
www.vanagain.com

On Thu, Sep 19, 2013 at 12:26 PM, Richard A Jones <Jones@colorado.edu>wrote:

> I'd like to check my radiator with an IR thermometer,
> but with the AC condenser on the front and the fan
> shroud on the back, I don't see how to scan the
> radiator for hot/cold spots.  Any advice?
>
> '87 Westy Syncro.
>
> Richard
> dry and undamaged in Boulder, Colorado
>

--
Thanks,
Ken Wilford
John 3:16
www.vanagain.com