I could agree with the 'still more air in there theory' ..
but more importantly ..
ALWAYS  have the heater valve open when filling and running a freshly
installed engine or cylinder.

making sure coolant is flowing fully through the heater circuit with a
freshly filled cooling system..
that's like 'fundamental' ..
always always always make feeling good heat out of the front defroster
vents part of your 'I'm getting this thing running for the first time ,
cooling system wise'  procedure.

really .  If someone did that ...didn't have the front heater working
fully ( and rear too ) when filling a cooling system, that was working
for me ..
I just wouldn't know what to say.  IMO it's as basic as air in tires.

lol..I'm still shaking my head.
how could someone take a head off, fill the cooling system, and not have
the heater working and fully checked out before heading out somewhere
..?????

live and learn ay !?

On 9/14/2014 2:28 AM, J Stewart wrote:
> 1985 Westy, 1.9 with new right side cylinder head. Driving back from my apartment last night it was actually getting a bit chilly so I turned on the heat. When I did the cylinder head I replaced the water pump, thermostat, and temp sensors. Prior to that the van had always run cool and heater output was on the weak side. Now the temp needle sits just a little north of the LED, still touching the LED, but just a little high. Anyway, last night the heater output was very hot, but for about 10-15 seconds it turned cool then hot again. Does this mean I still have a bit of air in the cooling system? I'm thinking maybe yes.
>
> Jeff Stewart
>