# 1999 pontiac grand am 3400 **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [October 26, 2008, 5:32pm UTC](https://community.cartalk.com/t/1999-pontiac-grand-am-3400/21264 "2008-10-26T17:32:17Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![tomybell](https://avatars.discourse-cdn.com/v4/letter/t/838e76/32.png) [@tomybell](https://community.cartalk.com/u/tomybell)\ **Post date:** [October 26, 2008, 5:32pm UTC](https://community.cartalk.com/t/1999-pontiac-grand-am-3400/21264/1 "2008-10-26T17:32:17Z")
ok my car started to over heat but really what was happending was the coolant was just over flowing ok so I have changed the themoasta twice bleed the system twices 7 times still the same ,replaced water pump bleed the system still the same replaced radidaor and cap still the same now have changed the head gaskets still the same results…runs great good heat then as the car warms up gets to about 224 just be for the cooling fan kicks in the coolant still comes out… bleed the system with a vacum system to make sure …still the same…please if anyone knows whats wrong please tell me …p.s. the heads are good ---
**Author:** ![Joseph\_E\_Meehan](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joseph_e_meehan/32/21_2.png) [@Joseph\_E\_Meehan](https://community.cartalk.com/u/Joseph_E_Meehan)\ **Post date:** [October 26, 2008, 8:52pm UTC](https://community.cartalk.com/t/1999-pontiac-grand-am-3400/21264/2 "2008-10-26T20:52:15Z")
my car started to over heat but really what was happending was the coolant was just over flowing How did you determine this? How many miles on the car? I would test for exhaust gasses in the coolant. I would also try a second thermostat. It is not totally unheard of to get a bad one. ---
**Author:** ![TJScott2012](https://avatars.discourse-cdn.com/v4/letter/t/e68b1a/32.png) [@TJScott2012](https://community.cartalk.com/u/TJScott2012)\ **Post date:** [October 26, 2008, 8:57pm UTC](https://community.cartalk.com/t/1999-pontiac-grand-am-3400/21264/3 "2008-10-26T20:57:15Z")
your running 50/50 coolant right? if not, that can get it hot too. sounds to me as if your coolant system is clogged. pull your radiator hose and see if anything coes out. while the car is cold, of course ---
**Author:** ![tomybell](https://avatars.discourse-cdn.com/v4/letter/t/838e76/32.png) [@tomybell](https://community.cartalk.com/u/tomybell)\ **Post date:** [October 27, 2008, 5:45pm UTC](https://community.cartalk.com/t/1999-pontiac-grand-am-3400/21264/4 "2008-10-27T17:45:54Z")
the car never went past 225 in temp 121000 miles tested the gasess passed 4 times havent tried 3 thermostat ---
**Author:** ![tomybell](https://avatars.discourse-cdn.com/v4/letter/t/838e76/32.png) [@tomybell](https://community.cartalk.com/u/tomybell)\ **Post date:** [October 27, 2008, 5:48pm UTC](https://community.cartalk.com/t/1999-pontiac-grand-am-3400/21264/5 "2008-10-27T17:48:19Z")
new hoses upper and lower new water pump new head gasket 2 theromstats new radiator stll the same results…lose heat then coolant pours out the over flow ---
**Author:** ![tomybell](https://avatars.discourse-cdn.com/v4/letter/t/838e76/32.png) [@tomybell](https://community.cartalk.com/u/tomybell)\ **Post date:** [October 27, 2008, 5:49pm UTC](https://community.cartalk.com/t/1999-pontiac-grand-am-3400/21264/6 "2008-10-27T17:49:19Z")
and yes 50/50 mix