Replacing the EA888 water pump/thermostat module is a mid-level DIY that saves a big bill — a common leak point.
Steps:
- Drain the coolant (lower hose or block drain).
- Remove the serpentine belt if it's in the way (Serpentine Belt Diy) and any brackets/hoses over the pump.
- Unbolt the integrated pump/thermostat module (plastic assembly on the block), catch the coolant, clean the mating face.
- Fit the new module with new O-rings/gasket, torque the bolts to spec, reconnect hoses.
- Refill and bleed — fill, run with the heater on, burp the system; trapped air causes false overheating.
Gotchas: replace as a whole module (consider a metal impeller); bleed thoroughly — air pockets are the usual "still overheats" complaint.
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