Heater valve

[Kneale Brownson]

The default position of the heater valve is open--to allow coolant flow 
through the heater core.  Cabin heat vent Temperature regulation is by 
having the flaps in the heater core box set to have air from the blower 
bypass--or not--the heater core.  The flaps are controlled by that 
little motor on the driver side of the heater core box.  The valve 
closes upon a vacuum supplied via the HVAC controller.  As I read the 
Bentley, (D8-40-1),  the electrical contact is there to show whether the 
heater valve is open or closed.  Far as I can tell, its only purpose is 
to throw a fault code if the valve remains open while the A/C operates.  
There is mention in the exhaustive HVAC diagnostics that if you have 
less than minimum specified A/C function, be sure the valve closes when 
the A/C is activated.

quikqtr at yahoo.com wrote:
> Danny, according to Alldatapro the coolant temp sending unit located in the heater water valve is for the HVAC system.
> It is most likely used to keep the blower motor off or slow when heat is called for in AUTO mode & when the coolant temp is LOW...
>
> Alldatapro also say's that the value of that sensor can be read on channel 6 on the Climate Control Head.
>
> Later, Randy
>
> Sent from my HTC EVO 4G I got from www.randymueller.acnrep.com
>
> ----- Reply message -----
> From: pyro_10314 at yahoo.com
> Date: Sat, Oct 9, 2010 8:25 am
> Subject: Heater valve
> To: <200q20v at audifans.com>
>
> What's up all, I was drivin home last night and my car started pissin out coolant from what appeared to be a crack in the heater valve. I parked it on the side of the road and when I got home ordered a replacement. There were 2 different types to order, one with an electrical connector on it and one without. I recall that there was a connector on mine but when I searched for the valve in the bentley I couldn't find it. Do some cars have the connector while others don't? I believe the connector has something to do with the a/c. Tia.
> Danny
> Sent from my Verizon Wireless BlackBerry
>
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