If the thermostat is working properly, vehicle speed shouldn't affect the
heat as little coolant is flowing through the radiator.  When idling, the
water pump is turning slower, less warmed coolant is flowing through the
heater cores.

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Dave Mcneely
Sent: Wednesday, January 06, 2010 1:32 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: No heat at stoplights.

Someone else suggested the no heat when stopped situation is normal
during cold weather because the coolant temp drops.  In my experience,
and that of a good many others, Vanagon usually runs cooler when moving
than when idling, due to increased air flow through the radiator.  But,
if the water pump is moving fluid poorly, perhaps the radiator and
coolant pipes would have stagnant coolant.

On Wed, Jan 6, 2010 at 12:13 PM, Don Spence wrote:

> Tired water pump.
>
>
> On 6-Jan-10, at 8:38 AM, Automatic digest processor wrote:
>
>> No heat at stoplights.