I checked the voltage to the device by the firewall and found 12V on each outside to center connector with engine up to temp. I pulled the device out and took it apart. Inside I found that 1 of the plungers had a bit of crud on the side of it that could have kept it from moving. I cleaned it and put it back together. The other thing I noticed is that the water flow is in the opposite direction from what I had imagined. This device appears to restrict water flow out of the firewall, not into it. Before I put it back in I checked the resistance of the 2 coils and found one side at 10 ohms and the other about 1 ohm. I imagine one of the coils probably is bad. I put it back in the car until I can get the part. I was wondering if someone who has this device in their car would check resisatnce for me with a digital meter from center post to each outside post and post the results.
BTW - I checked the voltage again just after starting the car and had 12V on both even though the engine temp was only 60C. Don't know if the water was flowing or not though..
Thanks...