re[placed waterpump. still leaks. how do i find the leak

Asked by Jun 14, 2012 at 05:20 PM about the Pontiac Grand Am

Question type: Maintenance & Repair

3 Answers

65

I had the same problem with a 2000 Chevy Silverado Z71. I had to replaced the radiator after 180,000 miles and decided not to initially replace the water pump (if it ain't broke don't fix it). What can and did happen in my case is that hard water scale, almost like crushed rock, can be freed up from your cooling system any time you change a cooling system component. My water pump worked fine and had been changea about 3 years earlier. The gears that turn your water pump are kept dry by a rubber seal. If you get any loose debris in your cooling system (that hard water scale in my case) it can deteriorate that seal in your water pump and the pump starts leaks a slow leak from a weep hole in the front of the pump itself, usually located behind the fan blade. It is always a good idea to do a system flush before replacing your water pump. I did not flush mine because I was replacing the radiator and all the hoses. The scale that I dislodged was in the engine. It is also possible to get a water pump, especially a refurbished one, with a bad seal. Its hard to see the water coming out of that weep hole because of its location behind the fan blade. I had to get underneath with a flashlight and still it was hard to find. I hope this helps.

pressure test the system & look with a bright drop light .if it was the water pump & it still leaks from the water pump you either didn't clean the surface or you left something loose. you have to remove the old gasket or it will never seal. if it s not the water pump sounds like a hose or head gasket.

7,185

to look around the weep hole and lower areas, i use a small mirror. something like a 3"X4" girl's purse type or dental nickel size. small mirrors plus a flashllight are good to get by tight areas you need to see.

Your Answer

Add photo

Related Questions

Grand Am

Looking for a Used Grand Am in your area?

CarGurus has 1,183 nationwide Grand Am listings starting at $1,599.

ZIP:

Search Pontiac Grand Am Questions

Pontiac Grand Am Experts

#1 tenspeed
tenspeed
Reputation 7,690
#2 John Saffrahn
John Saffrahn
Reputation 1,600
#3 Tom Demyan
Tom Demyan
Reputation 1,440
View All

Related Models For Sale

Used Pontiac Grand Prix
30 Great Deals out of 2,863 listings starting at $1,600
Used Pontiac Firebird
4 Great Deals out of 768 listings starting at $1,791
Used Chevrolet Impala
592 Great Deals out of 34,064 listings starting at $899
Used Pontiac G6
91 Great Deals out of 4,082 listings starting at $1,650
Used Ford Mustang
537 Great Deals out of 45,845 listings starting at $1,999
Used Nissan Altima
1,154 Great Deals out of 79,677 listings starting at $500
Used Chevrolet Camaro
245 Great Deals out of 31,195 listings starting at $369
Used Pontiac GTO
4 Great Deals out of 465 listings starting at $6,000
Used Chevrolet Malibu
1,065 Great Deals out of 77,909 listings starting at $1,500
Used Honda Accord
947 Great Deals out of 77,741 listings starting at $899
Used Pontiac G8
14 Great Deals out of 379 listings starting at $5,800
Used Honda Civic
815 Great Deals out of 88,110 listings starting at $1,299
Used Chevrolet Monte Carlo
20 Great Deals out of 1,419 listings starting at $1,995
Used Chevrolet Corvette
147 Great Deals out of 20,685 listings starting at $3,995
Used Pontiac Bonneville
4 Great Deals out of 511 listings starting at $1,799

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.