Temp At 240 Please Help....

[Ros981500]

My 98 chevy K 1500 5.0 is running at 240 degrees. Last week I replaced head and intake gaskets. along with three different thermistats. first two would not open. There is no air packets in cooling system.also has new heater core which is a month old flushed radiator and block to make sure there was no blockage. With in five minutes of runnig truck will reach 240. If you take the stat out the truck runs at about 125. the only thing that has not bin replaced is the radiator and water pump.

[tblake]

Feel your upper and lower radiator hoses after your truck warms up. Are they different temperatures? If so, I would suspect maybe the stat is sticking again, or the waterpump isn't curculating.

[tblake]

BTW, what brand stat did you go with and what temp? Isn't the stock them on these truck 195? I would stick with a delco stat or esle super stant brand. None of them junky cheapo ones.....

[Ros981500]

both hoses feel the same temp and the stat is 198 degree from carquest and its the third stat today..

[tblake]

Oddd, Stupid question, but are you putting it in in the right direction? Spring side goes toward the engine.

[Ros981500]

that is a stupid question. AND NO IT NOT!!!!!!!!!!!!!!!

[j cAT]

Originally Posted by Ros981500

that is a stupid question. AND NO IT NOT!!!!!!!!!!!!!!!

not really a stupid question....with your problem this guy is very correct...there are a lot of stupid people on these forums...thats why there here to learn and save some money/time with vehicle issues...

since you have no overheating with the thermostat removed I would say you have the wrong thermostat or defective ...many a thermostat made today is chinese crap...get the correct exact replacement for your engine ...and as he also stated 198degF is an incorrect thermostat..for your engine..that is an odd temp..

the thermostat should have a small hole in it so that the coolant can very slightlly bypass it...this then allows the thermostat to open as the coolant flows...obviously if you have the wrong thermost this will not occur...

[Ros981500]

so your saying because my lower and upper radiator hoses are not warm as well as they radiator. that this is caused by the wrong thermistat.

[j cAT]

Originally Posted by Ros981500

so your saying because my lower and upper radiator hoses are not warm as well as they radiator. that this is caused by the wrong thermistat.

think about this !!!! the thermostat don't open so how are the hoses going to get hot ?????????????????????

the damm engine becomes a pressure cooker! hoses never get to see any heat, NO FLOW .......

[j cAT]

Originally Posted by Ros981500

so your saying because my lower and upper radiator hoses are not warm as well as they radiator. that this is caused by the wrong thermistat.

just thought of this ,,, this is the same type of problem one would find when you don't have enough antifreeze on a very cold day...the coolant in the radiator freezes and the engine overheats..

the hoses are frozen and the engine is smoking hot..same as your engine ,,NO flow!

[Ros981500]

what is your problem sorry if this questions are stupid to you but a have had along day and my head is not on straight because my mother jus died today smartass

[The_Mechanic_33]

Last week I replaced head and intake gaskets

Is the fan shroud on?

[j cAT]

Originally Posted by Ros981500

what is your problem sorry if this questions are stupid to you but a have had along day and my head is not on straight because my mother jus died today smartass

well sorry to hear that about your mother ....I wouldn't be even thinking of a vehicle problem if TODAY my mother died...

its only a hunk of iron and plastic..

[j cAT]

Originally Posted by The_Mechanic_33

Is the fan shroud on?

did you put coolant in it ..

[Ros981500]

I live two hours away and this is my only vehicle and i have to have it fixed yesterday i guess i trie the stat for a 4th time and yes the fan shroud is on