4.7 ltr overheating i have a 180 thermo and e fan.and it did this before these mods...basically if its 95 degrees or hotter , it loves to heat up. going 60 - 70 on the highway and then getting off the ramp at an exit, stop for more than 10 sec...there goes the gauge ...on its journey to " h". pisses me off ..what do you think? just had radiator flush done too... water pump...heater core...head gasket?? any sugg.?

 

maybe air in your line it messed theromstats up alot

 

My water pump blew at 45k miles; left me on the side of the road. Are you losing any coolant?

 

my water pump went as well. actually it built up so much pressure, it was pushing the plastic caps on the radiator out. then i started loosing coolant.got the radiator repaired and replaced the water pump. runs fine now

 

Check your coolant.It could be bad or you could be losing some.




04 graphite ram 1500 Larmie4.7with borla sys,edelbrock racing shocks and Jet chip.

 

All those are good questions. From what I've read, air in the system would do it. Every water pump failure I've experienced was accompanied by leakage at the weep hole. Has the system been pressure tested? Can't tell for sure if the last items you mentioned are things you've done, or questions for the crew. If you grip the water pump pulley, can you move it in any direction? If so, it's bad. What year, and how many miles?

 

i know that they made sure air was out of the line and i dont smell /see any antifreeze leaking anywhere and it seems that the coolant level stays where its at.

 

its a 4.7 ltr , 2004 and the things that i mentioned above are things i suspect.....the radiator flush, efan and 180 thermo are things ive done..its has 78 k on it , manual trans.

 

I have the same problem on mine. I've changed the thermostat and took the water pump off and inspected it. It's still good. Just completed a radiator/engine coolantfluid flush. The fluid looked great and nothing was leaking before or after. Its still over heating.
I can regulate it using the heater. It does not matter if I have a load in the bed or not.
I've had the intake manifold gasket leak on my pontiac V-6, this is a whole different animal.
Seems to overheat quicker above 45 MPH. However I did get it to overheat once at idle after 20 minutes or so.
Any info or suggestions will be appreciated.

Todd

 

I agree with Outlawscomment about putting in a 180 thermostat.
I did it to my Hemi. It didn't do anything for performance, kept it in "cold loop mode" for an age so I was using more FUEL[sm=boohoo.gif][sm=noooo.gif][sm=yikesomg.gif] and at todays prices, that's a BIG NO NO.[:@]
My heater was cold and I could only ever get tepid air out of the thing and it wasn't a cold winter here in the UK when I fitted it in February, 4-6 degC.
So all in all, I don't rate the 180 Tstat mod.
I would think for your problem, that it's going to be either a sludged up rad and the e-fan youfittedisn't the correct CFM rating to cool your truck.
Your stocker was and did a good enoughjob at the time to try to cool your truck, but the rad or other problem such as the water pump going out it was a little too much for it to cope with, so it got hot and that's what you noticed before you installed your mods.
Your e-fan you have just fittedmight not be able tocope so well as the stocker, so the temp gets worse.
There's a lot of new mods done on your truck, which adds complications to this issue,as any one of them could cause more problems.
You need to go back to basics and test the water pump, check for air locks, check your radiator for sludge build up, make sure your Tstat is fitted correctly and opens/closes correctly. It has been known for the gasket to get "pinched" and cause problems. Really, just go over everything.
Another suggestion, is to get your coolant checked chemically, for emissions in it.
If there are, you might have anything from a head gasket problem to cracked heads which is apparantly common on the 4.7's if you read the forums.
Check your engine oil for emulsification, the milky creamy white stuff in the oil that's DEATH for all engines!
I know that this is a lot, but you must go back to the basics and work forward.
Hopethis helps??
Al.