Quote:
Originally Posted by Overboost
I see. Ok, you are not leaking from the sensor where it plugs into the expansion tank. You are leaking where the auto transmission thermostat is. Did the clip that holds the tank down go in place? Maybe an oring issue? What about the transmission thermostat, did you replace that? They almost always break when you change expansion tanks. 
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The clip would slide into place but I don't beleive the tank was ever on the fitting far enough for the clip to get in the grooves. I have a trans tstat but I didn't notice one on the car. Where was it supposed to be? Maybe this is why I cannot get the new tank to seat on the elbow
I just looked at a diagram on RealOEM of the cooling system. I think I see part, if not all, of my problem... I didn't know the tstat went inside the bottom of the expansion tank. I had never noticed that before. I was trying to connect it without the tstat. No wonder... Now its my turn to

Thanks for helping me out. I would never have known that if you hadn't induced me to study the diagram. Now I will try it with the thermostat, but no time soon. The tank I have isn't leaking I was just doing some PM on the cooling system. I have a new thermo and some hoses too. Thanks again.