2007 GMC 2500HD HEATER CORE PROBLEMS!! help
My trucks is a 2007 GMC 2500HD with the 6.0 gas job in it. Truck only has 76,000 miles and I have had it a little over a year. I bought the truck because of how pristine and perfect it was kept. Clean...
Forum Discussion
So lets start this way. You truck is LS based. Dex cool does not affect it like it did the 3.1, 3.4, 3800, 4.3, old 5.7.
You have a pressurized overflow tank.
If you keep Dex in it you are fine. You have a dry intake no coolant or oil touch it. The problem in the past was low coolant, air and acidity eating the plastic intake gaskets.
What you see in the overflow tank of you Tahoe no big deal, I have that in all my Dex cars.
My 00 WS6 has had DEX from day one and it is not pressurized, the LS1 does not suffer the DEX problems.(just a smaller aluminum block 6.0. It does not have a pressurized overflow tank like your truck and mine)
NOW having said all that. I would find who put the wrong stuff in it and have words. :). That will mess everything up. It will turn Dex to a gel like substance, clogging everything leading to failure in the highest point first...heater core
My guess is your heater core needs to be replaced. Then you need to flush the system and put the Prestone Dex in it.
I run the Dex in everything I have (all GM). I had to do the intake gasket on the Grand Prix (s/c 3800) but the updated metal gaskets pretty much solve the problem.
I too only use my truck to tow so it sit for long periods. I flushed this past spring and put Prestone Dex back in. Just like the Trans Am, clean as a whistle in there.
You have a pressurized overflow tank.
If you keep Dex in it you are fine. You have a dry intake no coolant or oil touch it. The problem in the past was low coolant, air and acidity eating the plastic intake gaskets.
What you see in the overflow tank of you Tahoe no big deal, I have that in all my Dex cars.
My 00 WS6 has had DEX from day one and it is not pressurized, the LS1 does not suffer the DEX problems.(just a smaller aluminum block 6.0. It does not have a pressurized overflow tank like your truck and mine)
NOW having said all that. I would find who put the wrong stuff in it and have words. :). That will mess everything up. It will turn Dex to a gel like substance, clogging everything leading to failure in the highest point first...heater core
My guess is your heater core needs to be replaced. Then you need to flush the system and put the Prestone Dex in it.
I run the Dex in everything I have (all GM). I had to do the intake gasket on the Grand Prix (s/c 3800) but the updated metal gaskets pretty much solve the problem.
I too only use my truck to tow so it sit for long periods. I flushed this past spring and put Prestone Dex back in. Just like the Trans Am, clean as a whistle in there.
