I checked my van tonight and this one time leak remains
mysterious.  I took the belt off the water pump.  The pulley has very
little play in it.  Almost none in and out along the shaft axis and
just a little click moving the pulley up and down.  That doesn't
really mean anything in terms of measurement, I know.  I will try at
some point to rig up a dial indicator to measure it.  the shaft turns
smoothly by hand with a little resistance.  I pressurized my cold
cooling system and got no leaking anywhere near the location that the
roadside leak occurred.
Puzzled-- Edward

At 07:39 AM 4/6/2010, Ken Wilford wrote:
>I concur with Dennis.  It sounds like a water pump starting to leak
>to me.  They can be intermittent some times.  You need to get this
>checked out and repaired very soon as the pump can lock up and fry
>your engine in less than a couple of minutes.  Let me know if you
>need any parts.
>
>Ken Wilford
>John 3:16
>www.vanagain.com
>
>
>Edward Maglott wrote:
>>I had driven for maybe 100 miles this morning, the last 20 or so on
>>the interstate.  I stopped at a rest area.  I usually let the engine
>>idle at least a minute in that situation because  I know it hates
>>that hard running then engine shut off scenario.  Well, I was in  a
>>hurry and shut off the engine.  I looked underneath to check for the
>>leaking ATF situation I've been having and to my horror there was
>>coolant dripping/running off of the oil filter and the oil
>>cooler.  It was probably a few ounces total.  I came back from the
>>restroom and set about finding what was up.  Looked from the top and
>>saw nothing.  Crawled under with flashlight and still could not see
>>anything in the way of a source of the leak.  started the engine and
>>revved it bit-  still nothing.  Coolant level was fine in both tanks
>>and the hose between them was secure.  I thought I heard what might
>>be water pump noise, but didn't take the belt off to check for play
>>in the shaft.
>>
>>Drove the rest of the way (about 160 miles of interstate, including a
>>mtn climb) home with eagle eye on the gauge and light and frequent
>>stops to check for leaks.  Nothing.  I'm guessing that the temp
>>spiked when I didn't let it idle after the highway running and maybe
>>had a pressure spike.  What in the area above the oil cooler and
>>filter might cause this intermittent leak?  The weird part is that
>>after that one time it didn't continue leaking.
>>
>>Edward