Hey guys I need your help. while driving my Iroc it ran hot so I took the thermostat out and its still running hot. I haven't found any leaks radiator is only a few months old and it seems the pump is working since water is flowing in the radiator and its not mixing with the oil. only way I'm losing water is when it's getting too hot and running out the overflow container.. any help would be highly appreciated

 

Does the fan(s) come on at any point ?

Assuming the coolant is fairly fresh and mixed correctly, whens the last time it's had a new radiator cap ?

 

yeah both fans ar running and have a new radiator and cap about 3 months old and new water pump as of last weekend...and new coolant afterwards

 

You've probably got a vapor lock in the top end of the cooling system.

Make sure your thermostat has a hole in it.

See https://www.thirdgen.org/forums/v6/6...low-after.html

 

I tried that earlier this morning hoping it would work out I drilled 2 holes in the thermostat and topped off the engine with coolant.... still overheating

 

I remember reading a forum on here about different types of water pumps as far as direction they are supposed to spin. It may be worth checking into if you can't figure it out. Maybe one of the more experienced members has some info about it. Also, are you sure the thermostat is installed correctly, and radiator cap shut all the way (not just in the vent position)? I know these seem like no brainers, but I'm just trying to throw some ideas out. I forgot to close the radiator cap completely and had the same problem you are describing. Let us know what you find out.

 

Check to see if your air dam fell off or somethings blocking the cool air flow.

 

I never had a air dam until the other day I went and got one and put it on just to see.. Yeah the caps on all the way...I feel like I'm missing something it never used to do this it used to stay below 160.

 

Radiator hose sucking shut, possible head gasket, mess with your timing any?

 

Define "overheating".

It's probably not, actually; just, pushing coolant past the cap.

Put a new cap on it.

 

If your car never got past 160 something is wrong.

You must run a thermostat.

Get a new cap too.

Pressure test your system.

 

never messed with the timing, hose is new and not closing... temp gets about 240.. was running a thermostat when It was running that cool... could be combustion gases leaking?

 

Pressure test your system.

 

Sounds like a head gasket.

 

alright..hopefully pressure test will tell me something...hopefully not head gasket.... weird thing is I drove it to work about 8 miles from my house and it ran about 160 again

 

Sounds like you may have had air in the cooling system after the pump change. (which shouldn't happen if you have some holes in t-stat.)
Also make sure you have the correct rotation pump.

 

drilled 2 holes in the thermo.

 

did you verify if the sensor for the gauge is reading correctly?

 

Im gonna get another sensor to be safe but I was still boiling out

 

ok so def overheating. whats your coolant mix? have you done a pressure test yet? I would also do a compression check. Also verify your water pump is working and flush out your heater core using a hose

 

i have flushed and honestly coolant wise 60% water or close to it. havent had compression or pressure checks done yet

 

that mix should work alright. get these checks done and report back. that will help us figure out what is going on

 

haven't gotten the test done yet but it may have been the air lock cause now she's driving at lower temps. Will post back after tests

 

its very possible that could have been the issue

 

sorry for the extremely late reply been busy with other things....everything checked out but still when driving for a while it will overheat but when im stopped at a light or behind people itll cool back down.

 

If you don't like having one-sided conversations with yourself, or listening to a bunch of "maybe it's this maybe it's that" from only people who have no experience and are sending on left turns down irrelevant pathways into the weeds, you might try TELLING US WHAT IT'S REALLY DOING.

Define "overheating".

For example, when you shoot the water outlet with your infrared thermometer, what is THE ACTUAL TEMPERATURE? (not the temp gauge reading) If all it's doing is boiling over, have you replaced your radiator cap?

 

That sounds like a stuck t-stat, just curious are you still running stock crank and water pump pulleys?

 

laser reading is 245 after a 15 mile test today. yes it's a new cap.

 

yes. crank and pulley system is stock

 

Have you burped the system to purge all air from it? If not, it will run "hot", cold, "Hot", cold, as the air bubble circulates.

How old are your hoses? It's possible that they are "sucking shut" at higher RPM's as the water pressure increases causing a no-flow or low-flow situation.

 

also didnt see where you said if you cleaned the rad fins and condenser