Truck Running Way To Hot
 

ok i got the dodge running again but she is running hot, the thermostat dont pop till the last mark on the guage which i dont like. then i only drops a hair below 190 which i dont like either. i noticed it isnt blowing hot air threw the heater eather. i raplaced the radiator cap and all i have now is hot air. should i replace the thermostat as well?

do a total flush .....you will be suprised what the glycol looks like, yes then do a new thermostate too

flush it its full concentrate i just added after rebuild, there is only 85 miles on that engine with all new fluids

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i also noticed a bubbling in my overflow bottle when i shut the truck off and open the hood

Are you runnin a 50/50 water/anitfreeze mix or straight anitfreeze?

mine runs at just under 200 usually, but it's a CR maybe they run hotter

well its like 3 gallons of atifreeze with 1 gallon of water

Maybe try less anitfreeze and more water? ? :humm:

you would think the more anifreeze the cooler it would run because it is more coolant

Yeah :humm:

not true, water is a better coolant alone generally, correct me if i'm wrong but in order to use the antifreeze as a coolant you need water as a catalyst to make the antifreeze do its job

When the engine gets hot does the heater blow hot air?
If the engine gets hot and the heater wont blow hot air and then when the temp falls rapidly and the heater starts to blow hot air. You either have a head gausket problum or their is some pesky air trapped in the system.

Good point bobcat

yes the heater does blow hot air as of right now, i dont think it would be a headgasket issue since i had the head reserfaced with a .020 over headgasket and studs, i wondering if it is becasue there is not enough water, i will take a look at it tomarrow and throw a new t-stst in anyway

is the water temp supposed to fluctuate or is it supposed to stay at one consistant temp?

Should rise up to 200 ish then fall below 190 when the thermostat opens. 50/50 is the max concentration you need on antifreeze, it does not cool as well when you go above that number for some reason. Crankcase breather vent blowing cra* into your radiator?
Good Luck!

nope no crap in the radiator, just replaced the head gasket last week and the t-stat with less than 50/50 concentration now it pops just past the 190 and drops below about 1/3 between the 190 and 140

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heres my thought if i cant get a 160* thermosats. back in the day my dad and granpa used to take there thermostats out of there trucks and just run them open in the summer, i cant imagine it being hard on a an engine, corect me if im wrong. an other way to do it is totaly elimintate the thermostat and put a sorta electric valve in instead of the thermostat and set it up on a heat timer to pop at whatever temp i want

You don't want to run without a t-stat, especially on diesels. It will take them too long to warm up, and it will wear out the engine faster.

If the temp still fluctuates, need another new t-stat.

holy hell ive done 7 t-states since i bought this thing. i would rather run a 160* one if they make it, are the ones from cummins better quality than the napa ones

Coolant has to be mixed 50/50 because ethyl glycol alone does not have the heat shedding properties that H2O does, it is a false statement in the fact that it is "COOLANT", it is an additive to help with freezing ( I mix mine 60/40 water to anti).

I would spring for a geniune Cummins thermostat, I will see if I can find the number I bought, it doesn't seem to have a real temp. swing like some experience.

ill call cummins northwest and get one of them from them tomarrow, i know i had 3 gallons of anti freez to 1 gallon of water 75/25 mix. i lost the radiator amount threw the blown head gasket and filled it with streight water. whatever that mix is then. we pulled the head and replaced the gasket and i filled it with one gallon of antifreeze and one gallon of water. so whoever is good with math figure that one out

Use an anti-freeze tester, and it can tell you what the protection level is.

I think the lowest you can do is a 180. Did you by chance clean and straighten all the fins??

no, they look fine to me but ill have to look again to see if they look out of wack

it sounds to me like you might have an air pocket trapped in yer coolant system. try this.

get some ramps, or a jack and some jackstands. either drive on the ramps (if they are rated for the weight) or jack the truck up and put the jackstands under it making sure that the radiator fill neck is higher than any part of the motor. this will help the air bubbles rise to the top, ie the filler neck. it will also help if you have someone with a vacuum deal that can pull a vacuum on the coolant system. this will speed the process of ridding the system of air. replace the thermostat and make sure it is inserted in the correct position.

hope this helps.

well i have a skid steer with forks on it i can lift the front of the truck that way. should i start it and let it run to see if the air will come out. your actually the secound person to tell me about the air theory. what do you mean by vacuum thing. should i change the t-stat with a new one even if this one only has about 60 miles on it

i would change it ..... to me it is cheap insurance.....

here is the snap-on tool RADKITPLUSA, Vacuum/Filler, Cooling System

here is the MAC tool Mac Tools Online Store - AEV700

You might presser check the cap it could be bad.

its a new, cab. i know now it doesnt have the compression leak that it did last week becaus eof the blown headgasket

Any updates??

well its still doing it but its not as bad as it was im trying to blead the system of air to see if it helps. but im in the same boat sofar

take the t-stat out and fill with 50/50 mix from t-stat port.Once it is full at that point, put t-stat back in. Fill rad until full at neck of Rad. start truck(with rad cap off and heater on Hot with defrost on) and keep filling until no more will fit. Fill overflow bottle (if you have one) between add and full. Put cap on and take for drive with heater on hot and on defrost. Get back and check overflow. let cool enough to take cap off and check rad level.
Drain that mix you have now and start with new 50/50 mix or 50/50 premix.

ill save that till summer thats alot of antifreeze to be buying at 12.99 a gallon concerntrate

Sounds like you might have a good air pocket stick in the block or head. also, antifreeze is a shitty coolant, water is better. the reason to use antifreeze is just to lower the freeze point of the water. Still, if it cools at all, sounds like a combination of a bad thermostat and a air-locked block.

well i wouldnt doubt it being an air pocket, i had the head off after rebuild, i bought another t-stat from cummins and im going to try that. it actually poped at 190 this morning but that was the only time today

Any updates? :pca1: