coolant leak at thermostat housing on Ford Focus SVT

Average mileage: 82,986 (68,586–117,000)
Engine affected: 2.0L 4 Cylinder DOHC
2 model years affected: 2003, 2004
5 people reported this problem
4 people shared problem details
2003 Ford Focus SVT- 2.0L 4 Cylinder DOHC85,000
Leaking aluminum plug in thermostat. Suspect failed O-ring but waiting for repair.
2003 Ford Focus SVT- 2.0L 4 Cylinder DOHC70,000
At first the dealer misdiagnoses the small coolant leak and made unnecessary repairs. Then the leak was found in a crack on the thermostat housing (which is plastic by the way). That was at 70,000 miles. Now at 110,000 miles, it has a tiny crack again and I am not going to spend $400 to replace it. I put in a chemical leak sealer.
2003 Ford Focus SVT- 2.0L 4 Cylinder DOHC68,586
i replaced the thermostat and the o ring must be my housing bcs i took it to a shop and they checked all my radiator hoses
2004 Ford Focus SVT- 2.0L 4 Cylinder DOHC117,000
4th leaking housing since new. Plastic cracks or oring fails
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