Hello, as a newcomer here I would like to greet everyone first. Have the technical forum already collated, but unfortunately did not find out. The following problem with my Volvo 850, B5292S : must replace the thermostat housing (abbreviation TG in further text) due to crack formation caused by improper use of a hammer. The TG is connected by 3 torx screws to the moror block. The upper 2 are accessible, however, the lower one is not. And here is the problem. 1.Is there possibly a special key? 2. My (unusual) guess should be built up: -Retainer of the servo fluid light machine (can you ask the key from the spanner itself?) -Lighting machine holder (as far as I can see it) But even then I am not quite sure whether this 3 screw is really accessible. 3. or must the suction manifold be removed? 4. or is this screw otherwise accessible? If someone is in possession of a “step for instructions” or would be very grateful with tips.