[urq] cooling system

[Ed Kellock]

At 3am last Saturday when I stopped for COFFEE on my way to the Pikes
Peak Hillclimb, my urq sprang a coolant leak right next to the clamp
holding the hose to the thermostat housing.

I replaced the hose last night along with the thermostat and the
thermo-time switch for the cold start valve.  I drove it around the
neighborhood and checked everything, then let it sit and checked
everything.  No leaks.

When I arrive to work this morning, there was a small leak, at a
different place, I think at the bottom of the hose that goes from the
coolant recovery tank down to the bottom of the radiator.

I noticed bubbling/boiling sounds in the upper hose just near the
head.  I carefully loosened the cap to relieve pressure.  Later when I
drove the car home at lunch, I left the cap just barely loose so as
not to build up too much pressure in the system and force the leak
again.  I also opened up the heater valve all the way and made sure
not to use any boost on the way home.  No leaking on the way or when I
arrived.  But I listened again at the upper hose and heard some
boiling/bubbling inside again.

Is this indicative of any particular problem?  Or might it be
considered normal?  Two coolant leaks back-to-back could be
coincidence, I suppose...

Ed