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PostPosted: Thu Nov 23, 2017 12:58 pm 
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Joined: Wed May 21, 2008 10:53 pm
Posts: 1877
Location: Sioux Falls, SD.
Year and Trim: 2005 GXP
Hey guys, Happy Thanksgiving to my fellow Americans. Been a while since I posted! I still have my '05 GXP and she's sick. :(

Had some symptoms of air in the cooling system - getting hot at idle/stopped, getting on the gas and temp falls to normal again. Heater blows cool/cold when temp is getting high. Never goes full overheat mode, but needle moving 3/4 of the way up the gauge and can hear cooling fans turn on. Doesn't get hot enough for the car to complain on the DIC or throw any codes (for now of course).

Anyways, had the system pressure tested and came back fine. Also had a combustion gas test done, and again came back fine. Had the system bled of air, but was told air is still getting in from somewhere. Car is doing better-ish for now, but I can hear gurgling from the driver's seat when cold and getting on the gas. I'm guessing the problem will come back.

I'm not getting any extra smoke in the exhaust, and car runs/idles/drives just as smooth as ever. Power is still there. I'm also not losing any noticeable amount of coolant, seeing puddles, or smell any coolant smells. Oil looks fine, coolant doesn't appear to be making it in the pan.

So it seems air is getting sucked/pushed in, but not sure how or from where. The place I had do the tests was stumped. Can it still be the head gasket if the combustion gas test and pressure test are both fine? If it is just fresh air getting in, how/where could it be forced in?

I have 110,000 miles, never had the coolant system flushed - still running Dex (probably original). Thermostat is original, but not sure if a faulty one could cause air pockets.

Any thoughts or directions would be massively helpful and appreciated!!! I'd love to keep my old girl up and running since I can't buy a newer one! #-o

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PostPosted: Sat Nov 25, 2017 11:42 am 
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Joined: Tue Jun 03, 2008 12:51 am
Posts: 733
Location: Missouri
Year and Trim: 95 SSEi
05 GXP
My thoughts.
If air is getting into the system than coolant must be leaving to make the room for it.
If the reservoir is not showing an increase in level than I would think coolant is
escaping. I'm assuming a shop bled the system, did they add a bunch of new
coolant?
I had coolant loses several times. Twice it was crossover gaskets, once it was
waterpump housing gasket, and once it was a cracked reservoir.
I could see or smell the issue each time, however.
Probably not a good idea to let coolant go 110K miles without changing, I would
do that after (or when) you find and fix this problem.

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Black 95 SSEi (original owner) 236K miles
Black 05 GXP (some idiot put the first 12K on it)165K miles
Black 04 Tahoe (original owner)284K miles
Black 16 Traverse (original owner)48K miles
Black 15 Lacrosse (some nice lady put first 15K on it)16K miles
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"You can have one in any color as long as it's black" - H. Ford


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