A coolant leak may develop from the water pump. The engine may overheat as a result of the coolant loss. A leaking water pump should be replaced.Google+
Car Problem Reports
Pontiac Montana Leaking Water Pump May Cause Coolant Loss and Overheating
Pontiac Montana Problem
Engine Affected: 3.4L V6
Average Mileage: 132,516 mi (96,000 mi - 230,000 mi)
Visitor, 1999 Pontiac Montana, 3.4L V6
I am loosing water out of the resivor about every 2 days.The temp gauge keeps reading hot
Visitor, 2002 Pontiac Montana, 96,000 mi
temp gauge topped out into the red zone when at an idle. thought it was a relay or bad fan. shop trouble shot to a leaking water pump and replaced the water pump and did a coolant system pressure test, flush and fill. Two days after I got it back, it showed signs of coolant leakage (it has never had any leaks in the past) and now the radiator is wet at both corners and coolant is dripping.
Coolant leak at left front under radiator cap. Found leak at radiator core tank seam. Replaced radiator core.
Visitor, 2000 Pontiac Montana, 127,134 mi
Engine Coolant light has came on for twice in two weeks, I've replaced it every time the light has come on. However, it seems that there is a leak somewhere between the reservoir and the radiator.
Visitor, 2003 Pontiac Montana, 3.4L V6, 100,000 mi