heater core?

[REDHOSS02]

i have been having issues with my truck overheating and can't yet figure out y. i noticed this morning on my way to work i turned the heater on to warm it up a bit. on high it would blow hot for about 30 seconds then blow cold. if i turn it to low it would stay warm. i dont understand this sh!t

 

[Darius6t9]

t-stat might be stuck closed. Just guessing here. But that would make sense to me.

 

[JoshH]

Is the coolant low?

 

[REDHOSS02]

i was thinking t-stat too but it is a brand new t-stat but sh!t happens it could be.
no the coolant is not low!

 

[REDHOSS02]

also my floorboard is DRY

 

[REDHOSS02]

Does anyone have a pic of how the t-stats sit in the housing? Are they both the same t-stat?

 

[JoshH]

Does anyone have a pic of how the t-stats sit in the housing? Are they both the same t-stat?

No, they are not both the same. I don't have a picture, but the spring part goes on the bottom.

 

[REDHOSS02]

I just went out to check the upper radiator hose. Its about 60 degrees here and its been sitting for about 3 hrs. The hose is still hard.

 

[REDHOSS02]

no, they are not both the same. I don't have a picture, but the spring part goes on the bottom.

thats what i thought and i know the one closest the the front of the truck is right but i dont know about the rear. I guess im gonna have to pull that housing to have a looksee.

 

[REDHOSS02]

How can you tell if the t-stat is stuck in the closed position with it removed from the truck?

 

[REDHOSS02]

okay i heated both up with a torch and they both opened but i dont know at what temperature they are opening at! ???????????? help!

 

[Darius6t9]

Put them in a pot of water with a thermometer and bring to a boil. Check what temp they open at on thermometer. Doing it with a torch could verywell have gotten rid of whatever was keeping it closed. Torches get HOT!!!!

 

[REDHOSS02]

Haha! Yep i did the boiling water test and the "180" didnt open till about 200 and same for the new one!

 

[REDHOSS02]

So im gonna try the heater core trick!

 

[REDHOSS02]

HEATER CORE IS CLEAR! BLOCK TEST IS NEXT I GUESS! IF ITS NOT HEAD GASKET THEN ITS GOTTA BE THE WATER PUMP! AND IF THATS THE CASE THEN I CAN DEAL WITH THAT AS LONG AS IT STAYS BELOW 82 DEGREES OUTSIDE

 

[maxaholic]

You said your radiator hose was hard. Did you pressurize the system, or is that just from driving?

 

[REDHOSS02]

thats just from driving!

 

[REDHOSS02]

i did a block test and the color did not change in the tube!

 

[maxaholic]

If your hose is hard from driving then you might have a blown headgasket. Pull your glow pliugs and look for any signs of coolant in the cylinder. Or sweet smelling smoke out the exhaust.

 

[REDHOSS02]

Now heres a little more info....right after the rebuild it was hydrolocking after the engine was shut off and sat for a couple hours. And he found two bolts that bolt the intake manifold to the head, and they are located in the intake y bridge. He said those bolts go through a water jacket and several guys on here said bull shit. So anyways he pulled those bolts and pipe doped them and now its not hydrolocking. But before he sealed those bolts it wasnt overheating!