2004 Chevy Duramax

**DM57** · 10-05-2010, 06:50 PM

LLY Duramax motor, 75,000 miles. The Engine Coolant Hot/Engine Overheat lamps are chimming. The temp guage seems to be normal and the motor does not appear to be hot. I have plenty of coolant also. Anyone ever experience this? Any ideas?

**Cdog** · 10-05-2010, 06:56 PM

You could have a bubble stuck in the cooling system. I've also read that some guy's are having head gaskets fail. So you could be getting air in the cooling system.

Check with dieselplace.com

**troostr** · 10-05-2010, 08:27 PM

Warped Heads. If so, you'll start to see coolant seeping down the block at the worst spot- not cheap, for your sake I hope I'm wrong.

**NAFLASH** · 10-05-2010, 09:19 PM

Do yourself a favor and buy either a LBZ mouthpiece or an AFE mouthpiece. That will cure your overheating issues. Check out duramaxforums.com for a better answer as well.

http://www.duramaxforum.com/forum/04...dated-yet.html

**LSXINDUSTRIES** · 10-05-2010, 09:36 PM

I dont think anybody actually read his post....he said that THE TEMPERATURE GAUGE IS READING NORMAL, THE MOTOR DOES NOT FEEL HOT, but the overheat / overtemp warning is on. Sounds more like a problem with the dash cluster or the body control module, which interperets the information that it is fed from the ECM and translates it to the dash cluster driver information center (message box). Check the coolant temp with a temp gun or a mechanical thermometer, to determine if the dash temp gauge is correct in reading normal, or if it is in fact overheating and the temp gauge is at fault.

**BoatPI** · 10-06-2010, 06:12 AM

You may want to call to take it to the dealer as most diesels have a 100K warranty. They can check the VIN and tell you. Ford charges me $100 for the diesel warranty repair and mine is an 06'. I had a bearing take a dump last year, $100.

**Luvnlife** · 10-06-2010, 06:14 AM

Post this up in the Tow Vehicles section. There is a member who is a GM tech who will chime in. He's helped me and others out before with the very few Duramax issues

**troostr** · 10-06-2010, 09:19 AM

Originally Posted by Luvnlife

Post this up in the Tow Vehicles section. There is a member who is a GM tech who will chime in. He's helped me and others out before with the very few Duramax issues

Yep, he's kinda like the Maytag repair man.

**DM57** · 10-06-2010, 03:07 PM

Thanks for the replies, very helpful. Took it to the local mechanic and everything is pointing toward the gauge cluster. He can't find anything else wrong. The motor is not running hot, no leaks, plenty of coolant etc. It appears that it is under warranty still. I have already had the cluster replaced a few years ago, and I'll take it back to the dealer and have it replaced again.

**NAFLASH** · 10-06-2010, 03:48 PM

While that may be the cause of you problems, the LLY's are known for overheating issues, and there is a TSB out for this. Not trying to bash on you just looking out. My buddy toasted his motor...

**LSXINDUSTRIES** · 10-06-2010, 07:29 PM

Cluster? Wish i would have bet somebody 5 bucks

**Mandelon** · 10-07-2010, 04:58 AM

I have that truck and a couple years ago, my temp gauge kept reading odd temps. It would randomly fluctuate from normal, to hot, to the coldest setting. It would tell me I was overheating, then 30 seconds later it was at the coldest and enriching the fuel mixture. It played hell with the idle.

It turned out to be a tiny short in some multi pin sensor connector. As I recall, the dealer replaced it multiple times on warranty until they figured it out. I think it is located on the passenger side, down below the headlight assembly....

I can find out what it was from the service writer if you need the info.

**DM57** · 10-07-2010, 09:42 AM

Originally Posted by Mandelon

I have that truck and a couple years ago, my temp gauge kept reading odd temps. It would randomly fluctuate from normal, to hot, to the coldest setting. It would tell me I was overheating, then 30 seconds later it was at the coldest and enriching the fuel mixture. It played hell with the idle.

It turned out to be a tiny short in some multi pin sensor connector. As I recall, the dealer replaced it multiple times on warranty until they figured it out. I think it is located on the passenger side, down below the headlight assembly....

I can find out what it was from the service writer if you need the info.

Thank you, it is at the dealer now. Ill let you know.

**AZJD** · 10-07-2010, 10:35 AM

Are you running a tuner?

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2004 Chevy Duramax

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