type 44 heater valve

[Snoopy]

Nick Lawrence wrote:
> I have '90 100, 90 200, 91 100.
> Asking about the water heater valve. 
>      the '91 100 has an electrical connection
>      the '90 100 has the wirng but has not had a valve with electric since I've owned it (several years)
>      the  '90 200  no electrical connection on valve, don't remember seeing any wiring.
> 
> So I ask, what is it for?  Does it need the connection?   
> The non_electrical are a little shorter and it is a stretch to fit hoses.
> Local flaps don't show a heater valve with an eclectrical connection in  the listings.

Do you have climate control in your cars? The connection is for temp sensor, 
which shows up in AC diagnostic mode. And it is different from gauge sensor , 
despite electrical diagrams showing wires going from the same multifunction 
sensor to gauge and AC head.

I suppose it is for more accurate opening during the cold weather. While 
engine is heating up, it stays closed. When the temp sensor triggers, the 
valve is opened. If the sensor is more close to the heater, it gives better 
reading. But I always wondered why the sensor is located after the valve, not 
before :)