Thanks. I'm just surprised, I guess, that if it's a bad t-stat that there's no reading whatsoever on either the gauge or the DIC. I'm really an older car kinda guy used to mechanical gauges. I'll pick up a new t-stat and hope it fixes the problem. Thanks again!

Pop "p0128" into the search box or google to get the why. It is well covered and frankly gets boring to me.

Sorry, didn't mean to imply I was asking for an explanation -- just saying I was surprised is all. :smile:

FWIW, when I was about two blocks from the auto parts store, the temp gauge suddenly started working again and the temp climbed steadily from ~170° to the 195° I'm used to. Bought the new t-stat anyway and will replace tomorrow (after the car has cooled down). Sure acts like a stuck t-stat that loosened up again, so this should fix it. Thanks again!

Thats not what I meant, this tiny keyboard is my problem.

Actually that is pretty normal for the gauges to start working again. The gauges will only blank out, if the engine does not warm up properly within a certain time frame. So, if it is a warm day to begin with, or if you let it only cool down partially, it will take less time to come up to temp (even with the thermostat partially jammed open) - and the gauges will work.

Let us know how the replacement goes, and if it resolves your problems.

Problem solved. Not quite at easy as an old small-block Chevy, but not terrible by any means. Once I got the old one out, it was obvious that it needed to be replaced (old one on the left, replacement on the right):

https://www.chevyhhr.net/gallery/fil.../4/_115486.jpg

https://www.chevyhhr.net/gallery/fil...011_174359.jpg

Took it for a short drive and it got up to temp right away. Thanks again for the advice! :thumb:

Just curious, what brand? The one that came in my 2011 does not have a large inner rubber seal, you can barely see it, it's not big enough to make a problem.

The thermostat is covered by the 100,00 mile warrantee? Even if the vehicle (I purchased new in 2006) is 9 years old? It has 50,000 miles on it.

NO. Those powertrain warranties are 100k miles or 5 years. Whichever occurs FIRST. You are way past 5 years.

Hello guys & gals,

I used this thread back in July 2014 to replace the thermostat. About 8000 miles later getting the p0128 code. I picked the thermostat at Adv Auto Parts and it wasn't the ACDelco brand. I did check my coolant levels and seem fine. Anyone else have this issue?

-Also can I damage the car if I keep on driving it like this?

Thanks in advance.