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Coolant Loss, no heat in car - have I a head gasket or air lock issue ?

rczpali

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This is the diagram of the part from Peugeot . 1764965106092.pngwhich matches the NAPA unit I ordered . however the connections on the stat on the car are different .The unit I have has a lead into the top of the unit near where the bleed screw now is , and also a 4 pin oblong shaped connector.. Is the item marked 10 the connection which would be on top of ,my current old stat?
 

rczpali

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This is along the lines of what is fitted to the car . 1764968968915.png and the new unit is clearly very different in plugs.
 

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