Twice when I've had this problem it's been the rear heater core.  They can
weep enough to smell, but not see until they blow.  You need to slide out
the core. Just remove the screws holding the fan assembly to the floor and
raise it up a bit to get the clearance you need to slide the core out for
inspection.  No need to disconnect anything except maybe the wiring plug.

Stuart

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Roy Nicholl
Sent: Tuesday, September 08, 2015 9:59 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Faint coolant smell

All,

A couple of weeks ago, I replaced the water pump in the Hyena ('88 Westy
WBX).  The past few days, I've thought I smelled a faint trace of coolant in
the van itself.  I checked the hoses, the radiator, the front and rear
heaters (best I could using a camera probe and mirrors without removing all
the plastic) and have found no leaks.    I checked the bleeder on the
radiator, no leak.   I have seen no noticeable drop in coolant level in the
reservoir.

Any ideas on where I should explore next?

I have also noted that my temperature gauge is now running a little lower
(from top half to bottom half of LED ... about a needles width).   I plan to
open both heater cores wide (they are partially shutdown at the moment),
park with the nose in the air, run it for a few moments, then open then
bleed the system again just to ensure I do not have an air bubble.

Roy