heater dont blow hot

[stlcummins]

any ideas or links to threads? thanks.

 

[Scooter's Roofing]

make sure the cable to the blend door hasn't slipped off the post... happened on the 98 I bought last year

 

[K-Farms]

might want to start off with a new thermostat

 

[blkram]

Does the truck have enough coolant?

 

[duallyspeed]

Did you try to flush the heater core? The blend door has a pc of plastic that sometimes faulters.If you peel back the carpet and the padding then sneak a screwdriver in remove the motor.Before you do it put the heat at 12 o-clock then turn the key off.You can also open the glove box when the truck is up to temp and feel the heater core tubes one should be hot the other not as hot.
My guess is the heater core is shot.When you drop the dash to fix it do the ac too because that is going to leak soon anyway.

 

[stlcummins]

did the stat already, guess ill pull the dash... damn it. thanks yall

 

[duallyspeed]

did the stat already, guess ill pull the dash... damn it. thanks yall

It is cool you want to jump in there.Just test everything before hand.I tryed all the easy things too.I am in the same boat you are.Spring time dash job for me.My heat is bad and my ac leaks.

 

[thojer81]

might want to try and backflush the heater core before tearing into the dash.

 

[waldershrek]

You don't have air from the vents or you do and it just not hot?

 

[Smokin Smitty]

The line going into my core wont even get hot, it gets warm, but not hot...?
I flushed it and all. Any other ideas?
I think theres lots of us having this problem with these trucks right now.

 

[Lower]

DId you flush it backwards with pressure?

 

[Smokin Smitty]

I did, yes. Used a sump pump in a bucket and looped a hose back into the bucket with rad. flush treatment. did that for a good 30min.

 

[waldershrek]

I had the same problem and my heater core was plugged up with all sorts of crap. Once I replaced it I get great heat now.