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Date:         Sun, 14 Sep 2014 10:08:11 -0400
Reply-To:     Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject:      Re: Air Bubble?
Comments: To: J Stewart <fonman4277@COMCAST.NET>
In-Reply-To:  <1462375688.18044583.1410697688839.JavaMail.root@comcast.net>
Content-Type: text/plain; charset="UTF-8"

If all is well once the cooling system is working it will finish bleeding itself after number of heating and cooling cycles. You want to test the pressure cap to make sure it is working. As this is very important for the system to work.

Since the was working the heater(s) was bled at some point. Was there any change in engine speed or load associated with this? For example coasting down a long hill with throttle closed or maybe idling at a light?

The 1.9 cooling system is a bit challenged in that the coolant flow in and out of the engine is only at the rear. The heater only gets its supply from the right head. Intermittent heater operation is one of the symptoms that you are still getting combustion gasses into the cooling system. Loos of heat at low-idle speeds is a symptom of poor water pump performance often caused by the case being damaged from a previous water pump failure. It is actually possible to get a normal gauge indication and not have proper cooling flow on one side of the engine due to air-vapor bound condition. If it happens again you need to do some investigating.

Dennis

-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of J Stewart Sent: Sunday, September 14, 2014 8:28 AM To: vanagon@GERRY.VANAGON.COM Subject: Air Bubble?

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


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