Thermostat: Service and Repair

Removing and installing coolant regulator - GT3











Removal overview of the coolant regulator - GT3
1 Drain coolant
2 Remove closure cap
3 Remove coolant hose
4 Remove coolant regulator housing
5 Remove coolant regulator

Removal overview of the coolant regulator - GT3





1. Drain coolant
Open lid on the expansion tank. Undo the drain plugs on the two necks for coolant and collect coolant. After draining the coolant, fit new sealing rings on the drain plugs. Tightening torque 10 Nm (7.5 ft. lbs.) to 15 Nm (11ft. lbs.). (Figure shows only one of the two necks)





2. Remove closure cap
Remove the closure cap on the cylinder head over the oil extraction pump of the cylinder bank 1 to 3. To do this, remove the three hexagon-head bolts and remove the closure cap.





3. Remove coolant hose
Unclip the coolant hose on the housing of the coolant regulator with a screwdriver and pull the coolant hose up and off.





4. Remove coolant regulator housing
Undo the three fastening screws on the coolant regulator housing. Remove the coolant regulator housing. Do not use the seal again.





5. Remove coolant regulator
Remove coolant regulator with special tool 9627. Insert assembly aid between the sheetmetal edges as shown. Push the assembly aid against the spring force until the retaining bracket is released. Then turn coolant regulator by approximately 90° and take coolant regulator out of the housing.











Installation overview of the coolant regulator - GT3
1 Install coolant regulator
2 Install coolant regulator housing
3 Push on coolant hose
4 Install closure cap
5 Bleed coolant circuit





1. Install coolant regulator
Insert coolant regulator in the housing as shown. Push against the spring force using special tool 9627 and turn until both sheetmetal edges are touching the housing.





2. Install coolant regulator housing
Clean sealing surface. Position coolant regulator housing with a new seal. Tighten the three fastening screws to 10 Nm (7.5 ft. lbs.).





3. Push on coolant hose
Insert retaining clip. Push the coolant hose with a new seal into the coolant regulator housing. Push hose downwards until the retaining clip is heard to engage. Check the hose for secure seating.





4. Install closure cap
Reinstall the closure cap beside the oil extraction pump on the cylinder bank 1 to 3. Lightly grease the O-ring to do this. Press in the closure cap evenly by hand. Tighten the three fastening screws to 10 Nm (7.5 ft. lbs.).





5. Bleed coolant circuit
Bleed the coolant circuit carefully. To do this, lift the bow on the closure cap. Replace missing coolant.