Pontiac Grand Prix losing coolant in reservoir

Asked by Sep 13, 2013 at 12:10 AM

Question type: Maintenance & Repair

My 2006 Grand Prix makes gurgling noises when the
reservoir is empty.  Filled the reservoir, the noises stopped.
It is not overheating. Had the cooling system flushed & new
dex-cool added. Assumed air was in the system. 4 days
later, it makes the gurgling sound again. Checked the
reservoir & it was empty. Filled it & again, the noises
stopped. It's been bled...  am obviously loosing fluid but
cannot visually see any leaks from under the hood or from
underneath... nothing wet on the pavement. Can detect a
very faint antifreeze aroma when I get out of car but it's
only for a few moments then it's gone. The radiator is
always full but the top hose is very pliable when engine is
hot & running as if there's not much pressure. Any

1 Answer


Inspect water pump weep hole. If you see any signs of dried coolant around the weep hole replace water pump. With engine cool do pressure test. This will cause it to force coolant out the leak and on a cool engine it will not evaporate so its easier to find the leak. Also how old is you radiator cap. It must be in good shape and proper psi for cooling system to operate correctly.

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