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2011 GMC Terrain 2.4L SLE : Overheating and no hot air blowing from heater core

  • robert.lesaca
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12 Jun 2019 20:22 #30630 by robert.lesaca
ok...after doing that block tester kit and blue chemical did not change to yellow, I suggested to owner that its time to have the timing chain checked for looseness or what ever problem it might have. After two days being tested in the shop, they decided to open the water pump to check condition of chain, shaft, etc. According to them, they found a chain problem but did not explain further. Parts came in today and the owner hopes to get the the SUV by tomorrow. I will give an update as to what exactly they found out.

Based on some research I did, overheating is not a problem with this model of GMC. But if ever, the culprit lies mainly in the water pump area, specifically chain problem not turning pump properly..Thanks again !!!

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  • Tyler
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14 Jun 2019 15:38 #30678 by Tyler
Eager to hear how this one ends. :woohoo:

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16 Jun 2019 21:58 #30720 by robert.lesaca
Hi Tyler...it was a broken chain that was the root of the problem; pump wasnt rotating properly thus circulation was insufficient. SUV working excellent now with hot air blowing out of the vents too.

What puzzles me was the first shop that replaced the water pump did not mention any chain problem though they notice overheating and no hot air blowing out. Took it to another shop and they found a broken chain...customer satisfied with second shop job. Thank you for all inputs and comments given; much appreciated.
The following user(s) said Thank You: Noah

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17 Jun 2019 08:43 #30729 by guafa
Nice to know that and thanks for the info.

I suppose then water pump wasn't rotating at all. Also, due to this engine has two balancer shafts attached to the same chain, engine was vibrating more than normal.

Cheers.

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  • Tyler
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17 Jun 2019 11:11 #30738 by Tyler
That's definitely one to keep in mind for the future. :ohmy: Thanks for the follow up.

I'd be very interested to see how the chain was sitting on the water pump sprocket when they took the timing cover off. The sprocket had to have been at least trying to spin with the chain, otherwise Robert wouldn't have been able to drive it as much as he did.

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19 Jun 2019 14:58 #30816 by robert.lesaca
Yes, the engine would struggle when overheated...i guess PCM wanting to protect engine by shutting down which is what owner experience.

THANKS all...

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20 Jun 2019 04:53 #30837 by chasencai
I find a car repair blog on your problem,and i share it here,hope it can help forum friend.
http://www.car-auto-repair.com

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21 Jun 2019 10:15 - 21 Jun 2019 11:17 #30875 by Minor
I going to suggest you check the sensor that was replaced if it was an aftermarket sensor, it's resistance may be set too high because of patent rights for them to make it. I've been down this road once a long time ago on a Cadillac the fan sensor was not turning on the fan soon enough causing it to run hot. It had been replaced with a NAPA brand. I had to go to the Dealer to get the right one. Problem was solved. I'd also suggest wiping the memory in the ECM and the body control module. Let the engine block relearn again after replacing the sensor, I found many cars will run still on the old data from the last 40 starts making you think the problem is still there. Also if the body control module has the type the has to have the Doors in the heater box center to react right, that could be part of your problem. If it got corrupted or has lost power for some reason. Run the rest to center the doors in the control head. These are things no one thinks of and I found to cause problems and that has driven me nuts figuring out...
Last edit: 21 Jun 2019 11:17 by Minor.

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  • TheTechWhisperer
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21 Jun 2019 16:16 #30887 by TheTechWhisperer
I've seen at least 10 of these ecotecs with broken water pump chains just this year. You just take the 3 bolts off the access cover and try to move the gear with your finger (engine off obviously). If the gear moves, the chain is broken. The local parts stores stock the whole kits with guides, because it is so common.

I didn't read through the comments, so if someone already suggested this, then just ignore me

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