flushed coolant, new thermostat and still runs hot

[down4thakrown]

not sure why a carbed motor had a 195 therm in it, but anyway...

if your not pulling the 2 block drains, your not flushing the motor... on either side, right above the oil pan rail.. it's the only way to get the sediment out..

man, thats guna be a mess

Not likey anything to do with your problem, but radiators do clog up externally. I spent a bunch of time under the hood of my old Toyota truck once only to find the radiator clogged with fescue seeds from driving fast through tall grass. My tractor sucks enough stuff into the radiator to need cleaning yearly.

the outside of the radiator isnt bad at all

What kind of transmission?

700r4

Yeah, it your coolant keeps coming out brown, I would say you have a clogged radiator/coolant system. You could probably use a few more of those Prestone coolant flush bottles (following the directions carefully) until things get to the point where it's not brown. Remove the block plugs and drain it that way.

And that sludge ... yeah, that's not doing anyone any good. Seafoam!

You could also have a cracked head gasket which is allowing oil into the coolant? I would think you would have noticed the oily residue in the coolant if that were the case.

As far as "next oil change" ... why wait? It sounds like you need to do that this weekend.

ya im thinkin clogged radiator too. it will idle at 190 all day. but when you start reving/driving then the temp starts climbing.i thought you were suppose to use a bottle of seam foam to replace 1 quart of oil then run for a week or so then drain and refill oil. how should i do it. i was just guessing, i guess i could just drain some of the oil, enough to fit a full bottle of seafoam in it

 

[4xcrazy]

do you have a fan shroud installed?

 

[ryoken]

man, thats guna be a mess

thats why the first time i do it, i replace the npt plug with a Merc marine plug on each side.. like this... for future work...

you could use a quality petcock with a short hose attached too...

 

[down4thakrown]

do you have a fan shroud installed?

sure do, complete and un cut

thats why the first time i do it, i replace the npt plug with a Merc marine plug on each side.. like this... for future work...

you could use a quality petcock with a short hose attached too...

ya that sounds nice im goin to have to check into that

 

[British Slave]

Long grades and heavy load will cause over heating with a 700R4 in overdrive. Try dropping it into drive, no overdrive.

 

[4xcrazy]

Long grades and heavy load will cause over heating with a 700R4 in overdrive. Try dropping it into drive, no overdrive.

I highly doubt the "automatic" 700r4 trans is staying in overdrive on uphill grades though. I know mine like to drop out of OD on the slightest grade.

But still, drop it in 3rd so it won't hunt between the two until you are on somewhat level ground again.

 

[British Slave]

I could watch the temp go up and down when shifted. I learned the hard way that a strong head wind will do the same. Burned the transmission up pulling a trailer loaded with deer blinds against a 30 mph wind. Never thought about the OD. My wifes GMC pickup would do the same in hot weather on long grades and no load till I installed cooler.

 

[down4thakrown]

Long grades and heavy load will cause over heating with a 700R4 in overdrive. Try dropping it into drive, no overdrive.

put it all the way down in first was doin onl 5mph and the temp would keep goin up. even put it down in 4 low with the hubs unlocked, but pinion bearings seized and the front axle caught on fire form oil leaking on it. and it glowinred from being so hot...got the fire out, let truck cool back down. burb fired right back up and kept on trucking

 

[Jessie James]

ya im thinkin clogged radiator too. it will idle at 190 all day. but when you start reving/driving then the temp starts climbing.

Yeah, sounds like the radiator and perhaps the block has restricted flow. Follow those tests I mentioned above. If something is not working right, especially having an un-pressurized cooling system, that can cause your problem.

Flush that system until there is no more sludge. You may even want to just replace the radiator, but not until you've cleaned the crap out of the block.

Remember your heater core is a radiator too... if it starts overheating, roll down the windows and turn up the heat and fan to full!