Coolant Leak & Engine Overheating on Pontiac Montana

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.

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Average mileage: 138,405 (26,672–239,000)
Engine affected: 3.4L V6
7 model years affected: 1999, 2000, 2001, 2002, more2003, 2004, 2005
23 people reported this problem
10 people shared problem details
1999 Pontiac Montana- 3.4L V6
I am loosing water out of the resivor about every 2 days.The temp gauge keeps reading hot
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.
1999 Pontiac Montana165,015
coolant leaking from the bottom of the water pump.
2002 Pontiac Montana124,856
I thought it was the thermostat, took it to service and have it tested and it was the water pump
2001 Pontiac Montana150,000
Overheating, replaced intake gasket, freeze plugs and hoses. Still overheating, bled the lines. Seemed to help but the next morning was overheating again.
Coolant is leaking and the over heating light keeps coming on.
2005 Pontiac Montana- 3.4L V6239,000
Just started leaking about 5 days ago... engine overheating, heating system obviously effected now and currently rushing to get repaired.
2000 Pontiac Montana127,134
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.
2003 Pontiac Montana- 3.4L V6100,000
Same thing
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