So, now continues the saga of the heat. As it can get cold here at night (6C the other night), I want my heat working.
So, I ran the following tests. I pulled the plug off the duovalve. The three wire plug. I then started the car and turned the heat to min. I then took an electrical tester, and put the ground in the center and checked the outside connectors. It was reading just about 12 volts. I then checked the resistance on the duovalve. It was somewhere around .015 ohms for both sides. Next, I checked the pump at both sides of the connector. Read about 13v. so, I shut the car off, and got a 12v battery, and some jumpers. The motor ran when I hooked it up, and both sides seemed to click when I connected the jumpers to them. It was hard to hear, but that seemed to be a case. I'm starting to think that it's just a bad rubber inside.
A few weeks ago, I picked a spare up at a scrapyard for $175. I ran all the same tests. The click for both sides was audible, and the motor ran properly. So, I closed random valves and blew through them (I don't like the taste of antifreeze), and some seemed the close when power was applied to them. Both sides seemed to operate properly. I guess I'll just pull the old one out, and put the other one in. I'll take the one that in my car now apart and see if I can find a way to repair the rubber inside....

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All it takes for evil to prevail is for good men to stand by and do nothing.

Too many people tip toe through life, never attempting or doing anything great, hoping to make it safely to death... Bob Proctor

'95 S320 LWB
'87 300SDL
'04 E500 wagon 4matic