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Old 05-16-2012, 10:16 AM   #1 (permalink)
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06 Engine Hot Message

I have an 06 Impala with the 3.9. We are getting a "Engine Hot AC OFF" message but the temperature gauge doesn't move off "C". Coolant if full. Could this be the thermostat or the temperature sensor?

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Old 05-16-2012, 10:41 AM   #2 (permalink)
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Possibly both, but definitely temp sensor.

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Old 05-16-2012, 11:00 AM   #3 (permalink)
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If it's just the sensor would it be OK to drive?

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Old 05-16-2012, 12:09 PM   #4 (permalink)
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does temp gauge move after starting car in morning, i had same message, pay attention to it it. i replaced sensor and did nothing. then noticed that when temp got to certain degree (same spot everyday) the temperature would drop to c, replaced thermostat and the inner gasket rubber thingy was all gnawled up.

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Old 05-16-2012, 03:31 PM   #5 (permalink)
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I would go ahead and replace both, they are cheap parts. As for it being safe to drive... as long as it isn't actually overheating, I wouldn't worry about it too much, but definitely keep an eye on it.

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Old 05-16-2012, 08:23 PM   #6 (permalink)
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What brand of thermostat did you use?
Also which rubber "thingy" did you change?
Do you rembered any part #s

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Old 05-16-2012, 09:29 PM   #7 (permalink)
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same thing happened in my 09.. replaced thermostat and worked fine.. the rubber in the thermostat was holding it open

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Old 05-17-2012, 08:08 AM   #8 (permalink)
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the rubber thingy is attached to the thermostat
part no. is 48808

Buy Stant Xactstat™ Thermostat, 185 Degrees Fahrenheit 48808 at Advance Auto Parts

it was $20.00

it's quite simple to do
open peacock - drain coolant below thermostat
remove two nuts from thermostat from upper hose
pay attention to how its pulled out, place in same way
and reverse

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Old 05-17-2012, 08:10 AM   #9 (permalink)
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^ correct

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Old 06-04-2012, 02:53 PM   #10 (permalink)
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Just removed the thermostat housing and the rubber gasket was bad.
Do you need to put RTV on the flange or just clean bot surfaces.
Thanks for all the help!

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Old 06-04-2012, 04:33 PM   #11 (permalink)
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I'm using the fail safe 195 degree from auto-zone for $11.99. The fail safe will stay in the open position if wears out so you will not over heat. I stay away from the 185 degree ones because GM engines do not run properly when they are to cool. Normal operating temp is at 195. Gm also recommends the 195 degree.
The first time I changed mine I used nothing. The problem with using nothing is it is such a pain to get that thing put back together the thermostat will slip just enough so that when you tighten the housing you will pinch the seal. So this second time I put a small bead of RTV black to hold it in place. I then let it sit for a few hours before I tightened 'er down. You can use the red or whatever. I had the black laying around so I used it.

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Old 06-05-2012, 01:28 PM   #12 (permalink)
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Thanks for the idea raider

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Old 09-15-2013, 11:04 AM   #13 (permalink)
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My 2008 Impala Lt with 3.5 Lt. Just started doing this last night with my Wife. I haven't driven it today, But I went out & Checked the water & Everything seemed to be alright. I was wondering, In a couple of peoples Post on this issue they said their Temp. Gauge went to "C". What caused that? Just Curious.
Thanks for the Advice I got from this forum, Will probably go & Get me a Thermostat today!

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Old 01-10-2014, 10:35 AM   #14 (permalink)
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im having this very saem issue in my 08 ltz now. gauge stays on C and gives the ENGINE HOT TURN OFF A/C message. looks like I need to do some work on her then

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