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First let me start off by saying that I hate, hate, HATE this vehicle. I'm a Jeep guy and always will be. That being said my mother purchased this car in 2010 with 20K on it and used it as her daily for about 6 years and in those 6 years. She didn't really keep up with her maintenance & ran this thing hard for those 6 years (I basically had to beg for her to take it to get it's oil changed everytime it needed it). It's had a rough life and it's now been sitting with this issue for 2 years because every time it's supposedly 'fixed' it comes right back & it's been nothing but issues hence why i've grown to despise this vehicle. We've taken it to professional mechanics (at least 3 different shops) to have them try and fix it's overheating issue and every time we get the call saying "you're all fixed up" we go a few days and lo and behold it overheats again. In the past 2 years we've gone through 4 thermostats, 2 water pumps, 1 radiator, 2 heater cores, a switch from dex-cool to standard coolant and this f****r is still overheating. The problem comes and goes as well. After completing my 2nd heater core replacement yesterday I took it for a 20 minute cruise around town, got up to 100mph on the highway A/C blasting on full to try and put the engine under max load and it maintained a cool 200* the whole time and I thought I fixed it. My brother (who is receiving the vehicle as a hand-me down) called me today and said the temperature gauge spiked for a few minutes and then went back down to 220. My suspicions are starting to lead me toward a faulty radiator fan or fan circuit because I don't know what else It could be aside from air in the system but I had the bleeder valve opened for 15 minutes while it ran and I manually pumped the hose's to try and burp the air out. I'm at a loss here and any help would be appreciated!

Thanks!
 

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First let me start off by saying that I hate, hate, HATE this vehicle. I'm a Jeep guy and always will be. That being said my mother purchased this car in 2010 with 20K on it and used it as her daily for about 6 years and in those 6 years. She didn't really keep up with her maintenance & ran this thing hard for those 6 years (I basically had to beg for her to take it to get it's oil changed everytime it needed it). It's had a rough life and it's now been sitting with this issue for 2 years because every time it's supposedly 'fixed' it comes right back & it's been nothing but issues hence why i've grown to despise this vehicle. We've taken it to professional mechanics (at least 3 different shops) to have them try and fix it's overheating issue and every time we get the call saying "you're all fixed up" we go a few days and lo and behold it overheats again. In the past 2 years we've gone through 4 thermostats, 2 water pumps, 1 radiator, 2 heater cores, a switch from dex-cool to standard coolant and this f****r is still overheating. The problem comes and goes as well. After completing my 2nd heater core replacement yesterday I took it for a 20 minute cruise around town, got up to 100mph on the highway A/C blasting on full to try and put the engine under max load and it maintained a cool 200* the whole time and I thought I fixed it. My brother (who is receiving the vehicle as a hand-me down) called me today and said the temperature gauge spiked for a few minutes and then went back down to 220. My suspicions are starting to lead me toward a faulty radiator fan or fan circuit because I don't know what else It could be aside from air in the system but I had the bleeder valve opened for 15 minutes while it ran and I manually pumped the hose's to try and burp the air out. I'm at a loss here and any help would be appreciated!

Thanks!
There are two cooling fans controlled by three relays. The relays allow the fans to be 0) turned off, 1) wired in series for low, 2) wired such that one is off and the other on full, for medium, 3) and both on for high. The engine computer controls the three relays.

If one of the relays is bad, when the engine commands the fans to go from low to medium (or medium to high), the fans may instead go from low to off (or medium to low). Don't hold me to all those possible combos, but understand, the fans may not step up like they're supposed to. With one intermittent relay, the fans will work correctly at some times, and not at others.

On the highway, enough air usually gets pushed into the radiator for this to go unnoticed, but around town, when stopped in traffic is when you'll notice it.

I don't know for sure if I can diagnose it down to one relay. But you can replace all three for about 30 bucks, a little less via mail order. In the underhood fuse block, these are labeled 28, 29 and 30.

HTH.

Doug

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Discussion Starter #3
Thank you for the reply Doug. I tested all 3 fan relays yesterday and they all clicked when hit with 12v power so I’m not sure if they are the problem (could still be worth a try for $30).
 

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Thank you for the reply Doug. I tested all 3 fan relays yesterday and they all clicked when hit with 12v power so I’m not sure if they are the problem (could still be worth a try for $30).
It's the contacts that can go bad. They may click, but not necessarily close the circuit.

And some times they do work, which makes them harder to diagnose.

HTH.

Doug

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They are easy, pull them out and test as shown here. Having worked at a radiator shop rebuilding radiators and doing coolant leaks sounds like one of two things either that dex-cool which is some nasty crap can build up inside the radiator, engine ect and even though parts were replaced if you dont blow all that crap out it just gets right into the new components clogging them up. Or you got a cracked head. You cant know if the head is cracked without pulling them off and use some dye and a black light to know for sure. What you can do to blow out your system is remove the t-stat, put the elbow back on, run the car with the upper radiator hose disconnected from the radiator and blow compressed air and water through it, you will need this to do that which you will have to make your self. You get the idea.
 

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First let me start off by saying that I hate, hate, HATE this vehicle. I'm a Jeep guy and always will be. That being said my mother purchased this car in 2010 with 20K on it and used it as her daily for about 6 years and in those 6 years. She didn't really keep up with her maintenance & ran this thing hard for those 6 years (I basically had to beg for her to take it to get it's oil changed everytime it needed it). It's had a rough life and it's now been sitting with this issue for 2 years because every time it's supposedly 'fixed' it comes right back & it's been nothing but issues hence why i've grown to despise this vehicle. We've taken it to professional mechanics (at least 3 different shops) to have them try and fix it's overheating issue and every time we get the call saying "you're all fixed up" we go a few days and lo and behold it overheats again. In the past 2 years we've gone through 4 thermostats, 2 water pumps, 1 radiator, 2 heater cores, a switch from dex-cool to standard coolant and this f***r is still overheating. The problem comes and goes as well. After completing my 2nd heater core replacement yesterday I took it for a 20 minute cruise around town, got up to 100mph on the highway A/C blasting on full to try and put the engine under max load and it maintained a cool 200 the whole time and I thought I fixed it. My brother (who is receiving the vehicle as a hand-me down) called me today and said the temperature gauge spiked for a few minutes and then went back down to 220. My suspicions are starting to lead me toward a faulty radiator fan or fan circuit because I don't know what else It could be aside from air in the system but I had the bleeder valve opened for 15 minutes while it ran and I manually pumped the hose's to try and burp the air out. I'm at a loss here and any help would be appreciated!

Thanks!
Mine had the same issue. It started out as “some times” over heating. Then it would pretty much make it 1/4 mile and be hitting the red. So after many trial and errors and a lot of wasted money lol.. I pulled the heater hose and checked the 3 way plastic connector. Found it was cracked and leaking just a little.. replaced it with a new metal one. Haven’t had an issue with it over heating again.
 

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Look I understand your hesitation with GM products - and I have a Jeep too, and it's been very reliable, but it's not about the car, it is more about the owner. Like you said, your mother did not keep up service on it. I wasn't a fan of the G6 first either but it grew on me. I inherited it also, almost by accident. I wasn't a big fan of American cars from the get-go for many reasons. I had a 1990 Ford Escort in 2002 that did not have one lever or switch that wasn't loose or dangling somehow.

After owning a used 2000 Chevy Blazer zr2 5-speed I bought with 90,000 miles that would pop out of second gear all the time, and give me no accurate fuel reading, I had a bad taste in my mouth. Prior to that I owned Japanese cars and had none of these issues. But they (are) boring. And then I went to the dark side, and bought an X3 on stick. That was a mistake. But over the more than decade of used car ownership I have, I am left with much facts.

The lady that owned the G6 prior to me had deferred most routine maintenance past where she should have. My 2010 Grand Cherokee Hemi has almost no issues at all at 140k versus my G6 at 215k, but both feel just as solid and reliable. The only big job that was done on my G6 was the transmission was replaced 2 years ago. All four wheels work in the Jeep all the time, and the G6 only has FWD. The G6 naturally has more pep in its step. The X3 also had all wheel drive all the time. And it did haul ass. The major problem with it was unreliability.

To keep a German car on the road after it is ten years old effectively turns out to $1000 a month. The funny thing about GM products, even after a rough life they have more longevity than foreign vehicles. Parts can be found far cheaper, when you can find them. Stuff that never goes wrong on a Pontiac would go wrong every 5 years on a German car. Even nowadays where German car companies no longer manufacture parts in the EU, they have higher margins than domestic parts. I used to frequent a foreign shop in Manhattan, and spent years helping the owners troubleshoot serious electronics issues. When I had to deal with BMWs or Benzes sitting after a few years, the parts list to bring them back to life would be endless. Engine harnesses would deteriorate, never to be seen again, because they were biodegradable.

I wonder if our harnesses are biodegradable.
 
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