The hot water control valve may develop a coolant leak resulting in engine overheating. A leaking valve should be replaced.Google+
Car Problem Reports
Cadillac Catera Hot Water Control Valves May Leak
Cadillac Catera Problem
Average Mileage: 111,900 mi (62,500 mi - 150,000 mi)
i need to replace it, with new
Visitor, 2000 Cadillac Catera, 150,000 mi
Heater control valve on back of motor is leaking. Working on fixing it.
Visitor, 2001 Cadillac Catera
Yup, mine leaks like crazy too! Replacing it this weekend!
Visitor, 1997 Cadillac Catera
will not hold coolant for very long it overheats quickly and has to be replaced
Visitor, 1998 Cadillac Catera, 125,000 mi
Heater Control Valve leak,
Visitor, 1998 Cadillac Catera, 102,000 mi
Yes, I have a water control valve leak as well. also I have a faulty EBCM. help