2006 3.9L ENGINE HOT A/C OFF Message - Page 3 - Chevy Impala Forums

It appears you have not yet registered with our community. To register please click here...

Chevy Impala Forums

Go Back   Chevy Impala Forums > Performance and Technical > Chevy Impala 8th Gen Discussion

Chevy Impala 8th Gen Discussion W-Body 2006-2013. Discuss all Chevy Impala 8th Generation Performance and Technical Discussion here.

Reply
 
LinkBack Thread Tools Display Modes
Old 06-01-2012, 10:09 AM   #31 (permalink)
Junior Member
 
jw06's Avatar
 
Join Date: May 2012
Location: lansing, Michigan
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Engine hot AC off - again

Two weeks ago I got the "Engine hot AC off" message and the temperature gauge went to cold. After reading these post I replaced the temp sensor and all was well until last night when the message came back. Could this be a thermostat too or could the sensor be bad after two weeks?

jw06 is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 06-01-2012, 10:18 AM   #32 (permalink)
8th Gen Antagonist
 
kingnutin's Avatar
 
Join Date: Mar 2009
Location: Vancouver , WA
Posts: 13,656
Thanks: 516
Thanked 1,192 Times in 788 Posts
Might be the pigtail for the sensor.

__________________
1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

kingnutin is offline   Reply With Quote Quick reply to this message
Old 06-01-2012, 09:15 PM   #33 (permalink)
OEM LOL

 
Ejbiers's Avatar
 
Join Date: May 2012
Location: Raritan, NJ
Posts: 3,772
Thanks: 437
Thanked 650 Times in 500 Posts
Exclamation Problem solved!

I had the same problem and it was my thermostat. I took the thermostat out and the rubber seal to seal the thermostat when its closed(not where it was sealed into the engine) was keeping the thermostat open all the time. If you let your engine hot a/c off message go long enough you will get a check engine light and a code(i forget the code) but the code will be the motor is taking too long to warm up (because the thermostat is stuck open and constantly flowing coolant through your motor instead of opening the thermostat and allowing coolant to flow only when your motor reaches 180degrees).

Do not try to pop your thermostat out and fix the seal it is most likely stretched out and shot and even if it wasn't it will still be damn near impossible to try and fix it. just spend the $22 for a new thermostat. The OEM thermostats are cheap and garbage which is why this is a common problem and alot of GM vehicles from pickup trucks to suvs to cars.

The reason you don't get a check engine light right away is because the car taking too long to warm up is not good for the car but its not gonna destroy the car. It will put a pending code on the computer though it just takes some time for the code to register.

Also the temp gauge on the newer cars are not a real representation of the temp. It is a estimate of where the car should be at that point in time. So all the computer does when that message appears is shut down your temp gauge (your motor isnt really that cold). People would freak out when they saw how much the temp gauges would fluctuate when driving so the car markers made the temp gauges 'artificial' so people wouldn't worry so much.

Hopes this solves your problem or at least gives you some insight on it!

__________________

2012 WRX LIMITED
Cobb Stage 2 @ 18psi

Know the truth
http://infowars.com
Ejbiers is online now   Reply With Quote Quick reply to this message
Old 06-02-2012, 08:58 AM   #34 (permalink)
Senior Member
 
systemcheck2006's Avatar
 
Join Date: Sep 2011
Posts: 166
Thanks: 1
Thanked 6 Times in 6 Posts
+1 for post

__________________


"If you went in the same direction as everyone else,
then you'd be normal."
systemcheck2006 is offline   Reply With Quote Quick reply to this message
Old 07-09-2012, 08:46 AM   #35 (permalink)
Junior Member
 
dalejrfan88's Avatar
 
Join Date: Dec 2011
Location: wisconsin
Posts: 26
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by systemcheck2006 View Post
+1 for post
I had the low coolant loss on my 07 3lt with the 3.9 but never got the "engine hot" turns out my 3.9 was eating coolant due to a bad coolant crossover pipe and poor headgasket and intake gasket...even when i was looking at several used models i noticed that the 3.9s and 3.5 always had very little coolant at the bottom of the resevoirs. Now i see in 2012 they finally went with a more sealed resevoir that is filled to the top


Last edited by dalejrfan88; 07-09-2012 at 08:51 AM.. Reason: spelling
dalejrfan88 is offline   Reply With Quote Quick reply to this message
Old 12-30-2012, 01:53 PM   #36 (permalink)
Junior Member
 
Impala_Ken's Avatar
 
Join Date: Dec 2012
Location: Western Wisconsin
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
I realize this thread is long cold (no pun intended), but just thought I would add my experience on my 2006 3.5 VIN-K. I got the same mystery message "Engine Hot, A/C Off" one day a few weeks ago, I thought I had overheated and ruined my engine (never heard a warning chime, maybe because my driver door speaker had recently failed). I thought I had ruined my engine, but the heater was working fine and the engine seemed okay. The temp guage stayed pegged at "C" through several warm-cool cycles, so replaced the sensor (had to remove driver-side upper motor mount and small coolant pipes to access the sensor. Problem went away (probably due to battery disconnect) for several weeks and through a long 3300 mile vacation, but came back last week. This time I replaced the thermostat since it appeared the observed engine temp varied between 185 and 203 degrees and figured maybe it was sticking (never had my analyze with me when the code would post). Has been quiet since, but won't know for sure for a few weeks. Old thermostat looked perfect, but I have 208K miles on this car.

Impala_Ken is offline   Reply With Quote Quick reply to this message
Old 12-30-2012, 01:58 PM   #37 (permalink)
Junior Member
 
Impala_Ken's Avatar
 
Join Date: Dec 2012
Location: Western Wisconsin
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Side note: the electrical info in Chiltons seem to indicate that the temp sensor is routed to the Power Control Module and Body Control Module before it goes to the temperature guage. I find it odd that when we get the "Hot Engine, A/C Off" message that the control modules seem to shut the temp guage off. Is there a flash fix for this???

Impala_Ken is offline   Reply With Quote Quick reply to this message
Old 12-30-2012, 03:08 PM   #38 (permalink)
463
Senior Member
 
463's Avatar
 
Join Date: Mar 2011
Location: Sask Canada
Posts: 1,216
Thanks: 8
Thanked 72 Times in 58 Posts
Hi Ken. when the "Hot Engine, A/C Off" message is on the computer is programed to shut the temp guage off. Is there a flash fix for this? Non that i know of.
The "t" stat can be checked with a thermometer and a pan of water as the temp rises to 195oF the t stat should open smoothly and close when removed fron the heat.
The temp gauge in the car should come up from cold to lets say sit at 1/2 way and stay at that point, at this point the t stat is controling temp and the cooling fans the take over the rest of the cooling as the cooling demands increase.
make sure the cooling recovery tank is at the full cold when the engine is cold, there is a chance the new temp sender is messed up or there is air in the cooling system.
A weak rad cap will also mess with the temp as the psi is to be at 15 lbs then the cooling system is working.

__________________
Welcome to the forum
463 is offline   Reply With Quote Quick reply to this message
Old 12-31-2012, 10:12 AM   #39 (permalink)
Junior Member
 
Impala_Ken's Avatar
 
Join Date: Dec 2012
Location: Western Wisconsin
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Thanks. This also may be old news, but when replacing the thermostat I did not follow my instincts and used the thermostat housing torque specs in the Chiltons instead (which is the same as the Factory Service Manual). When I heard the bolt fail I knew I should have waited and looked for a bulletin. Fortunately I had only stretched the bolt and there was enougn metal remaining and I could back it out. Could have been much worse. The thermostat seal is only a rubber O-Ring, I could have done it by "feel'.

For the V6, the stock manuals I have found specify 18 ft-lbs, which is WAY too much for M6 screws. Using the "Just Answer" web-site I paid an online mechanic to look it up and he found the following Bulletin which corrects the torque for V6 (covers 2006 -2008, I believe - did not see the Bulletin).
New specs: 7.4 ft-lbs, or 89 in-lbs.

I was guessing 8, within the range for an M6x1.0 bolt ( 7 - 9 ft-lbs).

Impala_Ken is offline   Reply With Quote Quick reply to this message
Old 03-13-2013, 05:51 PM   #40 (permalink)
DallaSS 214
 
TxImpala89's Avatar
 
Join Date: Aug 2011
Location: Texas
Posts: 923
Thanks: 201
Thanked 66 Times in 55 Posts
I got my struts replaced today (i know this has nothing to do with it) but i down the street from my house when the "engine hot/ac off idle engine" message came on the display and the temp gauge shot up all the way to the top to red! i pulled into my place and it went down to normal temp and the message dissapeared along with the continuous warning chime (all withing 2 minutes) what should i look into?

__________________

PROJECT LINDSAY!
TxImpala89 is offline   Reply With Quote Quick reply to this message
Old 03-14-2013, 06:46 AM   #41 (permalink)
Senior Member
 
ChevroletCustomerService's Avatar
 
Join Date: Nov 2010
Posts: 886
Thanks: 1
Thanked 55 Times in 43 Posts
TxImpala, I know you're seeking advice from other owners but I just wanted to let you know that visiting your dealership would be a great next step. This way their specialized technicians can run the proper diagnostic checks on your vehicle. And if you would ever like assistance working with your dealership towards a resolution, please feel free to contact me anytime through private message on this forum.

Best,

Katie
Chevrolet Customer Service

ChevroletCustomerService is offline   Reply With Quote Quick reply to this message
Old 03-14-2013, 08:38 AM   #42 (permalink)
DallaSS 214
 
TxImpala89's Avatar
 
Join Date: Aug 2011
Location: Texas
Posts: 923
Thanks: 201
Thanked 66 Times in 55 Posts
So on my way to work this morning the same message came on, this time with the "change oil soon & check engine light" managed to make it to where i change my oil regularly, they said the cam shaft sensor was leaking, I'm waiting here for further info :(

__________________

PROJECT LINDSAY!
TxImpala89 is offline   Reply With Quote Quick reply to this message
Old 03-14-2013, 12:16 PM   #43 (permalink)
DallaSS 214
 
TxImpala89's Avatar
 
Join Date: Aug 2011
Location: Texas
Posts: 923
Thanks: 201
Thanked 66 Times in 55 Posts
Now they are saying intake gasket! They don't know anything! Taking my car to my mechanic

__________________

PROJECT LINDSAY!
TxImpala89 is offline   Reply With Quote Quick reply to this message
Old 03-18-2013, 12:29 PM   #44 (permalink)
Junior Member
 
Impala_Ken's Avatar
 
Join Date: Dec 2012
Location: Western Wisconsin
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
On my '06 Impala 3.5 I replaced the sensor and the problem went away for a few weeks but came back. The dash guage does not read directly off the temp-sensor, the sensor feeds to the computer and then the guage is fed by the computer (was told it is done this way because the temperature actually varies so much it freaks owners out). Once the computer senses an over-heat it puts out the "Engine Hot, A/C Off" message and for some reason drops the temp reading to "C". Changing the sensor probably restored the temp range to the computer and allowed me to run "error free" for a while, but my real problem was the thermostat. The little rubber seal at the valve portion had disintegrated (not the seal around the outside edge of the thermostat body). Have not had a problem since I replaced the thermostat.

Shortly after that I had another sensor go bad on a cold night, the engine oil-pressure sensor. I was working far from home, so I shut the engine down and coasted to a gas-station (thank God, it was below zero). The engine sounded okay, but did not want to chance it, so had it towed to the nearest Chevy dealer who determined my oil pressure was good and the sensor was bad. I have 215,000 miles and the car and engine still drive like it always had, so I cannot complain too much!

Impala_Ken is offline   Reply With Quote Quick reply to this message
Old 05-16-2014, 04:36 AM   #45 (permalink)
Junior Member
 
Bobby69's Avatar
 
Join Date: May 2014
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Try replacing thermostat first. I replaced my sensor first and still got the same code..

Bobby69 is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply


Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Chevy Impala Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


LinkBacks (?)
LinkBack to this Thread: http://www.impalaforums.com/chevy-impala-8th-gen-discussion/241232-2006-3-9l-engine-hot-a-c-off-message.html
Posted By For Type Date
My 2006 Chevy impala dash readout says Engine hot ac off. What does this mean Dealer fixed the thermostat and still is running the same This thread Refback 06-24-2013 07:04 PM
Untitled document This thread Refback 02-23-2013 09:29 AM
Untitled document This thread Refback 12-22-2012 08:18 PM
06, 3.9, Turn AC off, engine overheating, Temp guage stays on cold - Chevrolet Forum - Chevy Enthusiasts Forums This thread Refback 08-07-2011 09:52 AM
06, 3.9, Turn AC off, engine overheating, Temp guage stays on cold - Chevrolet Forum - Chevy Enthusiasts Forums This thread Refback 01-05-2010 07:49 PM

Similar Threads
Thread Thread Starter Forum Replies Last Post
2006 3.9l with engine clack and rough idle spartus 8th Gen Engine Performance 3 11-15-2009 05:50 PM
Change Engine Oil Message luke_fairs Chevy Impala 7th Gen Discussion 9 07-02-2009 05:13 PM
message center problem ladyimpala 7th Gen Engine Performance 10 03-04-2009 06:58 AM
2003 Chevy Impala...Change engine oil message just came on.. is it simple to fix? backyard mechanic Chevy Impala Discussion 2 05-28-2008 05:40 PM




Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0 ©2011, Crawlability, Inc.
This site is not affiliated nor endorsed by General Motors Corp. Chevy Impala and related trademarks are the property of General Motors Corp.