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Pontiac Grand Am Overheating

19 messages,  Last post on Dec 03, 2009 at 5:19 AM

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#17 of 19 Re: 1999 Grand Am GT overheating and no interior heat [shmang] by datencio Oct 14, 2009 (12:35 pm)
Replying to: shmang (Oct 12, 2009 2:13 pm) Thanks for the reply it is appreciated.   Since my last post I decided to bypass the heater core just to see if the core was the problem. Took me about 20 minutes. Checked the coolant level and drove off hoping the engine would run at correct temperature. It did! I also ran it with the air conditioner on to load it and the temp stayed under 200.   Since I had no leakage inside the car I thought I would do a quick pressure check on the heater core. It held pressure even if one opening was not capped! I guess the core just got so clogged it would not allow flow.   I will still have to disassemble to replace the core but at least the overheating problem is gone. It is a little cold in the morning but hey this is San Diego.   After doing research I understand the repair manual is somewhat vague about replacing the core. Anyone know where I can get a good set of diagrams or a step by step procedure?   Again thanks for the replies   Doug Replies to this message: burdawg (Oct 15, 2009 7:23 am)
#18 of 19 Re: 1999 Grand Am GT overheating and no interior heat [datencio] by burdawg Oct 15, 2009 (7:23 am)
Replying to: datencio (Oct 14, 2009 12:35 pm) Try this: http://www.automotivehelper.com/topic672471.htm   I haven't done it myself. Before 1999 they recommended removing the entire dash for access, but it may not be necessary on later models according to these instructions. It's hard to believe that the core is completely blocked, but I guess it's possible..........
#19 of 19 Bypassed heater core still running hot. by skibaby1289 Dec 03, 2009 (5:19 am)
I had a friend of mine bypass the heater core for me because there was no heat and a kiddy pool on my passenger side floor. The floor is now dry, there is still no heat obviously. The leak from the bad hose is gone having been replaced with new hose and he drove it to test it out before i came to pick it up and he said it ran great and it is holding coolant. However when i went to drive it home i had to stop three times on the 25 minute drive back to my house because it was over heating. When i called him he said i should look at a problem with the oil because i know it leaks some. does anyone have any ideas? i have a 1993 grand am

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