Over-cooling problem is driving me crazy!

[Chewy1576]

I have the fan clutch and cap but no time to put them on. I will update when it's done.


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[zbaber]

I'm dealing with this same issue. I just replaced tstat with a Stant 195... replace fan clutch because mine was very stiff... and did a garden hose coolant flush & I'm pretty confident there is no air in the system. I get to 1/4 mark on the guage (I assume about 150 degrees) and never any higher. Air from heater is slightly warm-ish at best.

My lower fan shroud is not there (previous owner did 3'' body lift and left it off)

Having no heat sucks on these cold days!

 

[TwoPedal98]

I'm in the same boat, trucks running right at 165, it gets up to 195 shortly after starting and then as soon as the t-stat opens it's right down to 165, can hammer on it, let it idle forever and it never gets any warmer, and the heat sucks, t-stat is only a couple weeks old (didn't make a difference when I changed it) there's plenty of flow when I have the cap off, I've tried "burping" the system more then a few times, never seems to have air in it, fan clutch seems to be operating properly. I'm going to cut a piece of card board and cover about 1/3 of the radiator and see if it makes any difference. I'm just about out of options before I start replacing radiators and heater cores and whatever else!!

 

[Chewy1576]

My heater core was already leaking so I has to replace it. The heat got better but the temp problem remained. I did get the new rad. cap on and tried "burping" today but no change. I'm going to wait a few days to do the fan clutch so I can throw on a plastic 11 blade fan also.


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[Crash]

Try some cardboard. I put a pizza box lid in front of mine because I was tired of waiting for it to warm up, it helped with no side effects.

 

[Chewy1576]

New fan clutch and 11 blade fan are in. Still isn't getting up to temp. I looked in the reserve bottle and it's really dirty. I'm getting frustrated now so maybe it's time to drop it off with a shop and have them handle it. There are a few other nagging problems that need to be addressed too.

On the other hand, the 11 blade fan was a pain the the butt to install but it's so much more quiet than the steel 5 blade one. Good upgrade!


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[IOWNJUNK]

First thing I would do is flush entire system, especially now that you see inside the res is dirty. Maybe an electric fan/thermal switch?

 

[Chewy1576]

I did flush it out when I replaced the water pump and heater core a few weeks ago. Filled with water and ran some cleaner through so I thought it would have cleaned out fairly well. I hope oil isn't getting into the coolant...


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[Chewy1576]

Today I put cardboard in front of a quarter to a third of the radiator and the temp is still fluctuating. Should I try blocking off half or will it even matter?


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[4x4incountryboy]

perhaps the coolant temp sensor?