Correctly bled system or not, the electric fans are a bad idea.

Given how long he's been trying to bleed this system and still has entrained air, I'm beginning to wonder if he doesn't have an air leak. After a week's worth of heating/cooling cycles, I'd expect all of the air to have been forced to the top and have been bled out by now.

 

Well..... I did exactly as spike said and on my way to work I turned the AC on and the temp shot up and Ilost some coolant through the reservoir fill cap.The bubbles never seem to go away. It is as if I have a blown head gasket leaking exhaust into the cooling system, pressurizing it and causing a type of vapor lock that stops coolant flow. The only problem with this theory is that the cooling system maintains pressure even long after the engine is shut off. If i had a blown head gasket wouldn't coolant eventually leak back into the cylinder when the engine is shut off?? As far as the fans go I can push 4500 cfm. I did fail to mention that i have had this problem a few times since i replaced all of the components. It's all getting very frustrating. The truck other than that is in excellent shape, lift, 33's. I just wish i could get this resolved!!!!!!!!!!!!!!! Thanks guys for all of your input.

 

One thing I would add is that you need to start with the engine cool and the truck parked on the most dramatic incline you can manage.Open the bleed screw on the top of the radiator and fill through there. wait while the engine warms up, taking note of when the thermostat opens. Both heaters should be on high while doing this.

Once the t-stat opens, the level in the radiator should drop. Fill the radiator through the bleedplug and replace the plug. Then fill the reservoir.

I am thinking that the temp rose suddenly because the coolant finally raised enough to touch the sending unit. You have a tremendous bubble in the system.

 

Did you put the t-stat in the correct way? It is very easy to put them in backwards.

 

Thanks guys, I have tried the incline to fill it. The T-stat is definitely in the right way. I just drove it about 20 miles with no problems this morning. When i got back home I released a ton of air from the cooling system, coolant level is down slightly. If it's not the head gasket I am totaly baffled.

 

Ok, you need to stop releasing the pressure after you drive it. THAT IS NORMAL. It is a pressureized cooling system and the coolant resevoir is part of that system, everytime you release the PSI you are letting air get into the coolaing system thus causing your problem.
Let it be. If it is not overheatingthen forget about it.
And I can tell you from experience NEVER OPEN A HOT COOLING SYSTEM!! Getting burned in the face and chest with 250* coolant is not a pleasant experiance.
Only open it after it has sat all day/over night.

 

OK I'll leave it alone and see if it happens again, as far as the burn goes been ther done that it does hurt like hell. LOL Thanks

 

My heater core has now begun to leak.....................................

 

Oh no. Sorry to hear that. You can put a "U" shaped pipe into the heater lines coming from the engine to stop the coolant from going into the heater so that you can drive it until you can get it fixed.

 

Hey Spike wanted to know if it is normal to have bubbles coming from the throttle housing return pipe. I see the bubbles in the tank coming from the bottom of the reservoir which is coming from that return pipe. Does this mean that there is air in the system? Not overheating, hot air is coming from the vent and AC works fine. Please let me know what you think.

DSII 197,000 miles
replaced front prop shaft
new coolant recovery tank
modified TB heater hose and radiator hose
New Alternator
replaced TB heater plate kit (2 x)
Replace Serpentine belt
all of the scheduled maintenance including the transfer gear box oil fill up