Fitted new thermostat housing today. Bit of a shocker as it was slightly different from standard and didn't include the cover for the thermostat! Think the auto-shop would have asked me if I needed one.
The old t-cover had 3 very rusted torx head screws which had to be ground down to remove the cover. Then a quick visit to b&q to buy something that would substitute the 3 screws now headless. Got some upgraded 'coach bolts' with similar thread pattern but greater diameter and a pack of washers too.
I then realised the sensor hole on the top of the main housing was blanked off. Out with another power tool to drill through the thin plastic. It worked but required further fetling to put the sensor into the hole.
Finally finished with new jubilee clips as I can't stand the standard ones you find on houses.
A simple job taking ages. Lesson here buy genuine...


This is the old unit. As you can see it clearly has a hole for the sensor, not so on the replacement



This shows the old unit with the three old screws still in it and the thermostat cover removed. Also the replacement bolts I bought.



New 'revised' unit in place with new bolts and jubilee clips