Help: No Heat!

[12vBrandon]

This morning it was a little chilly out so i decided to run my heat. The Heat didnt cooperate with me to well...

I really have NO clue what the problem could be.
I'm pretty sure the cold a/c works though, havent really had the chance to check.

[12vBrandon]

Bump......

[finny]

probly the heater core.

[Hercules]

My first thought was the heater core, too. I've had to do this a couple times on my wifes Bravada to check for the heater core clogging up...the theory still applies to ours. Open the hood and locate the hoses that go through the firewall to the heater core. There will be two of them. Once you know which hoses your looking at, start the truck to warm it up. As the truck is warming up, you are going to want to start feeling the hoses periodically for them to increase in temp. If both hoses are getting hot, then more than likely the heater core is not clogged, or at the very least has some flow going through it. If one hose is getting hot and the other is still cold, then you got a clog. It's easier to feel a difference if you do this test when the engine is completely cooled down, like over night. If it is clogged, then post back what you felt and there may be a couple options you can do without having to take it somewhere to have fixed. Like I mentioned above, I've had to deal with this several times on my wifes Bravada and have tried a few things that work.

[12vBrandon]

So if its clogged what should I do? im not sure thats it, i'm just hoping it is...

[Hercules]

You have several options. On my wifes Bravada, I've been able to grab the hose that exits the heater core and start sqeezing. Do this with the engine off btw. This forces fluid back through the core and sometimes breaks lose clogs. Sometimes it takes a couple tries. Start the engine and see if it worked. If it didn't, try it again. If that didn't help, and another thing I had to do to the wife's truck once, was disconnect both hoses and hook up a garden hose to side that exits the heater core...the hose that felt cold. Then you turn on the water and back-flush the core. This particular technique was the last time I had to do anything to the core for probably 3 years now. There is a kit to do this that can be found at places like advance auto. Or, you could do what I did and duct taped the garden hose to it...I was in a rush and it worked. If none of this helps, then you will either have to have the heater core professionally flushed or replaced. Both are rediculously expensive at the dealer. I would just try to back-flush the system several times myself.

[Blue01Cummins]

is your truck heating up to 190?

[12vBrandon]

yes, it heats up fine, i have more fuel with a 3" exhaust... haha...

Hmm arent the tubes on the left side going into the firewall like near the turbo and stuff?

[plowboy1138]

yea if ur standin in from of the truck
if ur heater core is plugged up i would seriously consider a coolant flush your coolent should b changed ever 2years or 30k miles u most likly have sediment built up in the radiater and water pump also not to mention your block

[12vBrandon]

He said to squeeze them ^^ there metal arent they? and how do i disconnect them if there metal?

[notahemi]

Originally Posted by 12vBrandon

He said to squeeze them ^^ there metal arent they? and how do i disconnect them if there metal?

The metal lines are for your a/c... heater hoses are rubber hoses

[12vBrandon]

Haha well are the rubber ones like below the a/c or what? I figured the metal were for a/c...