2005 Duramax 6.6....Engine runs at low temp after about 20 minutes it spikes to 210-220 for about 30 seconds. Then runs at about 190-200. Never overheats but pukes antifreeze out of the overflow. Would this be a thermostat sticking or could it be something else?
Posted 2010-01-23 12:56 PM (#115626 - in reply to #115623) Subject: RE: Coolant
Expert
Posts: 3802 Location: Rocky Mount N.C.
Thermostat may be sticking, head gasket may be seeping compression into the cooling system, specially if it's puking Dexcool out the overflow. It may be something as simple as the gauge or sending unit. Get it to a dealer and get it checked out. Still under warranty?? 2004.5-2005 trucks had some problems with overheating. You may ask around over here.... http://www.dieselplace.com/forum/index.php
Posted 2010-01-23 5:54 PM (#115633 - in reply to #115623) Subject: RE: Coolant
Location: centrally located amongst the "NUTS"
A buddy of mine had this verything happen with his '06. We were out of town and thought that it was just the thermostat. Turned out it was the head gasket. Not sure what he paid to have it fixed.
Posted 2010-01-23 7:02 PM (#115636 - in reply to #115631) Subject: RE: Coolant
Expert
Posts: 3802 Location: Rocky Mount N.C.
Originally written by Gone on 2010-01-23 6:08 PM
Originally written by hosspuller on 2010-01-23 1:55 PM
Sure sounds like thermostat ...
Maybe Collapsed lower hose?
Try simple things first, bleeding the air from the system.
How do you do this? It started happening after the cap was removed and put back on.
Be sure that cap is screwed down tight... I topped off all my fluids this afternoon and that screw on cap on the coolant recovery bottle is hard to turn.... For those that don't know, the coolant recovery bottle is pressurized on these trucks and acts as a coolant reservoir. That's probably the power steering/transmission noise that you think you're hearing... It's the pressure escaping from the recovery bottle... Maybe.
Posted 2010-01-30 10:23 AM (#115914 - in reply to #115623) Subject: RE: Coolant
Elite Veteran
Posts: 1069 Location: MI.
It's doing it again....Changed the cap, bled the system....I called and the warranty is good until April of this year. We are going to take it in to the dealer. I'm starting to NOT like this truck. There's absolutely no excuse for a vehicle with less than 50,000 miles on it to be having problems with the motor and the rear brakes.
Posted 2010-01-30 6:37 PM (#115933 - in reply to #115623) Subject: RE: Coolant
Extreme Veteran
Posts: 420 Location: Florida
I deleted my posts above cause I thought you had it. I had my fingers x'd for you.
Now for the sad news. You most likely have blown your Head Gaskets. Very common and if in warranty your all set. If you do determine HGs and it is warranty or not make sure you stud it with ARP studs. Your dealer will add them for you as long as you provide them.
Check out the Diesel forms for your truck, talk to a respectable Dealer. Have some tests run and see where it goes.
I am holding out for 2012 model lines. That will be one year after all manufactures are forced to have changed their engines due to the stricter emissions required in 2011. The Ford is being brought back in house and is looking good. But Ford is adding DEF (Diesel Exhaust Fluid) to reduce the nitrogen oxide levels. My issue is its a separate tank that needs to be filled. Not sure what the costs are going to be and how available it will be. But I am diggin all the other options and specs published so far.
Posted 2010-01-31 12:53 AM (#115949 - in reply to #115623) Subject: RE: Coolant
Extreme Veteran
Posts: 544 Location: Claxton, Ga.
Certain Duramax engines have overheating issues that can cause problems. They didn't engineer for enough cooling capacity. I am not sure if you have the model with the issue. Get on a Duramax board and ask your questions. If it is blowing out the coolant tank, you have an issue for sure.
Posted 2010-02-01 11:38 AM (#116007 - in reply to #115623) Subject: RE: Coolant
Elite Veteran
Posts: 1069 Location: MI.
Head gasket....ARP (the difference was explained to me and I thank you Blazing CreekBar for the heads up) studs will be used. 48,000 miles....My 1/2 ton 5.7 96 GMC is more reliable and she has 225,000 miles on her. I USE this truck hard and she keeps startin' up and running smooth, no engine or tranny problems. The only repairs were basic....Good truck. I might shed a tear when she dies. It frustrates me and disgusts me at the same time. Can I ever trust this truck to get my horses and my family safely down the road?
Posted 2010-02-01 1:39 PM (#116012 - in reply to #116007) Subject: RE: Coolant
Expert
Posts: 3802 Location: Rocky Mount N.C.
Originally written by Gone on 2010-02-01 12:38 PM
Head gasket....ARP (the difference was explained to me and I thank you Blazing CreekBar for the heads up) studs will be used. 48,000 miles....My 1/2 ton 5.7 96 GMC is more reliable and she has 225,000 miles on her. I USE this truck hard and she keeps startin' up and running smooth, no engine or tranny problems. The only repairs were basic....Good truck. I might shed a tear when she dies. It frustrates me and disgusts me at the same time. Can I ever trust this truck to get my horses and my family safely down the road?
That's the thing with buying a used truck, specially a diesel.... No telling how hard it's been hot rodded before you got it. I kinda thought it was a head gasket all along, with expanding gasses pushing coolant out the overflow. Don't hear of many Duramax's with blown head gaskets. 6.0 Powerstrokes are more common with this ailment.
Posted 2010-02-01 3:49 PM (#116016 - in reply to #115623) Subject: RE: Coolant
Elite Veteran
Posts: 1069 Location: MI.
They are looking now to see if the other gasket is blown....jeez, how hard can you jack up a truck within 28,000 miles? I guess someone with endless funds...
Posted 2010-02-01 7:58 PM (#116025 - in reply to #115623) Subject: RE: Coolant
Extreme Veteran
Posts: 420 Location: Florida
Bummer, Well I didn't learn more about diesels than my Dealers mechanic because I wanted too. Dam joke what you can end up with and not even know it. Rentento is square on.
Next time I by new :)
So here goes the song and dance I have to give you. HGs blew for a reason. In my Ford It was mostly related to the oil cooler (location and size) but what people don't realize the failure of the oil cooler is due to a secret that Ford will never divulge. Casting Sand! No matter how many oil coolers you replace you will never fix the problem until you install a coolant filter system. Darn casting sand leaches from the block for the life (a short one) of the truck. I am not familiar with why your model line blows HGs but you should try to figure it out. Otherwise the issue will return. The Studs are an added security blanket when driving those head temps up on steep climbs.
I recommend some type of monitoring system. Get away from the dummy needles. I went low tech with a ScanGauge II unit (Love it)
Don't idle the new Diesels for more time than to bring up the oil pressure. It will ruin your EGR valve and clog your emissions. Always remeber anything emissions is a separate warranty which is fairly extensive beyond all other warranties (federal Gov stuff)
I noticed your miles are low. Lean over and I will wisper one more seceret in your ear.
After your HGs are done call GMC and tell them very seriously the following phrase:
"I have lost confidence in your product"
With the proper use of the phrase and persistance you may get lucky and be offered cost on a new vehical or the GMC extended warranty for no cost.