Overheating.
Champion
Joined: Aug 2009
Posts: 3,015
Likes: 8
From: Western NY,
I just put the 195 stat back in and replaced the temp sensor. [one on right with 2 wires] now my gauge reads just over half way when driving [210]. it runs consistent but its running hot. And sure enough, 20 minutes on the hill was all it took to get really hot. I am looking for the OEM fan clutch and blade now [dealer wants almost $300] at a parts yard. I do not think even that is going to do it though. I checked the radiator hoses a while back and the inlet was about 17 degrees hotter than the outlet,
BTW if you went from 34" to 37" tire diameter this changed your gearing and increased the load on your engine and transmission which will cause everything to work harder and get hotter as well as less power and mpg....that 3" makes a big difference... 4.88 gears are the closer factory match for 37-38 range... especially with the added weight. not that 4.56 wont do the job.... just not as well..and power and mpg results will decrease..
Last edited by Augiedoggy; May 10, 2012 at 11:30 AM.
Legend
Joined: May 2005
Posts: 8,663
Likes: 8
From: Central Oklahoma
Are you sure its not just your gauge thats off? a temp gun or good code reader with show what the temps really are... my gauge say 200 with the new 195 stat (had a 180 but everyone said they were bad for mpg since the pcm is looking to reach 195 before leaning out fuel...) if your cruising the rad should cool without really needing much help from the fan...
BTW if you went from 34" to 37" tire diameter this changed your gearing and increased the load on your engine and transmission which will cause everything to work harder and get hotter as well as less power and mpg....that 3" makes a big difference... 4.88 gears are the closer factory match for 37-38 range... especially with the added weight. not that 4.56 wont do the job.... just not as well..and power and mpg results will decrease..
BTW if you went from 34" to 37" tire diameter this changed your gearing and increased the load on your engine and transmission which will cause everything to work harder and get hotter as well as less power and mpg....that 3" makes a big difference... 4.88 gears are the closer factory match for 37-38 range... especially with the added weight. not that 4.56 wont do the job.... just not as well..and power and mpg results will decrease..
I have done some research on the site but have not seen anything that fits my problem.
1st: Guy before me swapped out the mechanical fan for 2 giant electric ones. they come on when they should and dealer swears they should work better than the stock fan.
2nd: I have replaced the T-stat with a 180 stat. [twice] just to make sure, Radiator is new
3rd: truck does not over heat under normal operating conditions unless I rev the engine high for a short while passing etc.
OVERHEATS WHEN: Problem occurs most when in 4x4 or 4 low and climbing hills etc. Anytime I am in 4x4 putting more than normal strain on the engine. The temps just rise and rise etc until the coolant overflow fills and then it just spits it out on the ground from the overflow.
This is where I am confused
. From the look of the overflow, its meant to do that. there is no hose attachment etc to recirculate the coolant when the PSI changes. its just a spout that dumps on the ground?!?!
Is this really normal?
Tranny and Transfer are normal temps, both rebuilt within the last year or so professionally.
Water Pump? [how do i test and what do i look for?] any suggestions are appreciated. [I jsut did the plenum a while back too and ignored the water pump like an idiot....
]
1st: Guy before me swapped out the mechanical fan for 2 giant electric ones. they come on when they should and dealer swears they should work better than the stock fan.
2nd: I have replaced the T-stat with a 180 stat. [twice] just to make sure, Radiator is new
3rd: truck does not over heat under normal operating conditions unless I rev the engine high for a short while passing etc.
OVERHEATS WHEN: Problem occurs most when in 4x4 or 4 low and climbing hills etc. Anytime I am in 4x4 putting more than normal strain on the engine. The temps just rise and rise etc until the coolant overflow fills and then it just spits it out on the ground from the overflow.
This is where I am confused
. From the look of the overflow, its meant to do that. there is no hose attachment etc to recirculate the coolant when the PSI changes. its just a spout that dumps on the ground?!?! Is this really normal? Tranny and Transfer are normal temps, both rebuilt within the last year or so professionally.
Water Pump? [how do i test and what do i look for?] any suggestions are appreciated. [I jsut did the plenum a while back too and ignored the water pump like an idiot....
]
Legend
Joined: May 2005
Posts: 8,663
Likes: 8
From: Central Oklahoma
I missed that. I'm now thinking if the radiator isn't clogged that either the water pump is pushing the coolant too fast or else it's the wrong radiator.
Champion
Joined: Aug 2009
Posts: 3,015
Likes: 8
From: Western NY,
I was thinking something would have to be up with the pump or flow through rad as well
Last edited by Augiedoggy; May 10, 2012 at 03:10 PM.
Champion
Joined: Aug 2009
Posts: 3,015
Likes: 8
From: Western NY,
? why do you keep saying that? Who even brought that up? a faulty one that doesnt open correctly can make a truck overheat!
And your plain wrong,
I just changed out my 180 stat with a 195 one and my engine water temp went from maxing out at 189 when fully warmed up to maxing out at 197 now so.....yes it changes the maxumium operating temp of the engine t before circulating coolant it to cool things down and effectively makes things cooler...
the thermostat is a switch.to turn the cooling system on and off.. Put a lower operating one in and you effectively change the operating temp just like a thermostat would change and lower the temp in a room when turned down and set to activate at a lower temp.... how do you thing they work?
someone else please chime in here!
And your plain wrong,
I just changed out my 180 stat with a 195 one and my engine water temp went from maxing out at 189 when fully warmed up to maxing out at 197 now so.....yes it changes the maxumium operating temp of the engine t before circulating coolant it to cool things down and effectively makes things cooler...
the thermostat is a switch.to turn the cooling system on and off.. Put a lower operating one in and you effectively change the operating temp just like a thermostat would change and lower the temp in a room when turned down and set to activate at a lower temp.... how do you thing they work?
someone else please chime in here!
Last edited by Augiedoggy; May 10, 2012 at 03:32 PM.
Legend
Joined: Jul 2011
Posts: 8,259
Likes: 4
From: Austin, TX
A 180 stat (functioning properly) will open sooner than 195, but if there is a cooling issue like excess flow or inadequate flow (clogged passages in block or rad) the rating of tsat will be inconsequential.
Head, blockage, air trapped in system.....something is causing the system not to provide proper cooling to the engine...
Head, blockage, air trapped in system.....something is causing the system not to provide proper cooling to the engine...
