Engine running hot

As long as there is no message of engine overheat. The characteristic of a Northstar is not necessarily a head gasket blowing, but much more a condition of the threads in the block failing causing lost clamping force and internal leakage. Make sure your cooling fans are coming on, at a minimum when the A/C is requested, and also at the higher coolant temperatures.

I would change the engine coolant temperature sensor it could be getting out of range so the cooling fans can come on easier. This guide will give you an idea on how to do it.

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

Here is a guide that can help

https://www.2carpros.com/articles/engine-overheating-or-running-hot

Please let us know what happens.

Cheers

That would be completely normal. The electric cooling fans are not programmed to come on until around 226 degrees. As long as the temperature responds to the fans, you are fine.

you need to watch the temperature on the dash.it will go to 220's then you will see it start going down when the fans come on.when the temperature is low enough they will turn off. when you see the temperature go back to 220's they will turn back on. the heater core could be leaking. the A/C case has a drain it has a rubber hose coming out of the A/C case. it is right below the evaporator. check it for coolant leaking.

My 1997 Cadillac DeVille was running hot spent lots of money need to take the 1/4" line from the reservoir tank to drivers side of the engine blow line and the engine mine was plugged solved my heating problem

Sounds like your cooling fans aren't working. Going down the road you will get enough air being forced through the radiator to keep the engine cool, but at low speeds or at idle, you need the fans. Most common failure is the engine temp sensor located on the thermostat housing. Or, it may be a control relay on the fan housing itself. Hope this helps.

I just bought this car and I have to put water in it anytime I go somewhere or it runs hot, what could cause this? Also IO33,IO34,IO37,IO39 show up on the code inspection thing. How can I fix this and about how much is this all going to cost me?

If coolant is depleting all the time, you have a leak somewhere or it could be worse, a bad head gasket.

Try clearing the IPC codes and see if they come back.

jess u need to have your coolant sys. pressure tested checked NOW.

Well I had the water pump, radiator hose, and a new timing cover gasket set put on it. But it still leaks the water out ... the water comes out before the car is even turned on.

Did you check where the leak is coming from before replacing those components?

That is a bad leak and you should be able to locate its source easily.

I have a 2000 Cadillac deville having a problem with the car running hot sometimes the gauge will reach all the way to the top but car never steamed or has white smoke coming from under the hood. I pull over let the car cool I check antifreeze usually takes anywhere from a quarter of a bottle to a half of a bottle and I'm using dex-cool (I have noticed that when the car is cooling before I put the antifreeze in it it does sound like water is boiling under the hood.)after I put antifreeze in the car it seems to run fine for about a week then it starts to run a little hot again I have noticed a little bit of an oil leak underneath the car not sure that has anything to do with this but I want to figure out what is making this car run hot I have checked all the fluids none of the fluids are mixing with one another . I go through a bottle of antifreeze in about 2 weeks. Do you think it could be a fan problem or do you think it could be a thermostat or radiator problem or maybe even a water pump issue? How much will it cost to fix?

fill it full and youll see it.gl

You to have to have the system pressure tested to see where the leak is coming from. You could start the cheap route and try replacing your cap to be sure it is working properly.

I had a new overflow reservoir put in along with a new pressure cap.

Ok, are you sure you burped all the air out of the system?

How can I get or br sure the sir is out of the system?

Engine Cooling problem
1998 Cadillac Deville V8 Front Wheel Drive Automatic 130,000 miles
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I replaced a water pump and a thermostat on a 1998 cadillac deville with the northstar engine. It starts to run hot at times. I was wondering is there a bleeder screw to get the air out? Please let me know. Thank You.

[quote:7736bb7cce="bluejean"]Engine Cooling problem
1998 Cadillac Deville V8 Front Wheel Drive Automatic 130,000 miles
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I replaced a water pump and a thermostat on a 1998 cadillac deville with the northstar engine. It starts to run hot at times. I was wondering is there a bleeder screw to get the air out? Please let me know. Thank You.[/quote:7736bb7cce]

is it running low on coolant still, dont keep running it hot you will do damage if its not already done. Have it pressure tested for leaks and get back to me

i'm loseing coolant but the ground is dry and the oil is clean.

Started running hot so we had to stick the thermostat open because you cant take it out in this car. it did good for a while then started getting hot again. please help me.

Are the cooling fans behind radiator coming on

Hey Michelle,

It sounds like you have a blown head gasket, here is a test you can use to help determine of that is the problem or not.

https://www.2carpros.com/articles/head-gasket-blown-test

and

https://www.2carpros.com/articles/engine-overheating-or-running-hot

Best, Ken

Engine Cooling problem
2000 Cadillac Deville V8 Two Wheel Drive Automatic 186000 miles
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I have a 2000 Cadillac Deville, It will run hot if I drive around 70 miles per hour for a period of time or if I run the air conditioner, I will have to turn the air off and turn the heat on until the engine get back to its normal temp. I have replaced the water pump and the Thermostat and there are no leaks, what could cause this?

Check coolant fan operation
fan should come on and not allow the engine to over heat

it wants to run hot all the time I replace the water pump thermostat fan relays.

have this checked for a blown head gasket. It may be that I am assuming you already did thermostat etc. then check when hot and engine off,fans disconnected for cold spots on radiator it should be about same tem p all ove if not the rad is bad. one other thing if coolant was run at higher than a 50/50 ratio it eats the aluminum up in bottom of block where head bolts go in and has to be torn apart and heli coils put in block . so it would be same thing as a blown head gasket but more severe

1996 Cad Deville. 75K We noticed last week when the outside temp reached 100+, the air conditioner was only 'cool', then we noticed that the car was running at 216-223. We had freon added and checked radiator coolant. All looked good. The outside temp has now lowered to 75, and the car is still running at 190-208 (generally the higher). We don't know what it normally ran at, I guess because it doesn't get that hot around here to need A/C often, so I didn't pay attention to the engine temp. With all the 'dummy' lights this thing has, I was sure it would tell me if anything was wrong. We haven't gotten any messages. (the check emissions light came on a month or so ago, but went off) A friend said perhaps the water pump was going out? We wondered about the thermostat. It has never 'overheated' beyond us noticing on the dash that the temp was high, and that the air wasn't cold. I ran with the heat, with vent only, every option to try to lower the engine temp but nothing worked (maybe newer cars don't cool down that way like my old ones did?) We are a single income family of 5 1/2 and this is our main car. Because we don't have a 'trusted mechanic' ourselves, and we aren't 'car smart' we really hope to have a direction to look before taking it in. Every penny helps in this family! Thanks for any help you can provide.

Internal combustion engines are heat generators all by themselves, when ambient temp rises, so will the underhood temps.The a/c problem....When it is running are both cooling fans running?If not then have them checked out.

Engine Cooling problem
1996 Cadillac Deville V8 Front Wheel Drive Automatic

HOW CAN I FIX THE PROBLEM OF IT RUNNING HOT

It all depends on the symptoms that lead to it running hot. It could be a stuck closed thermostat, in which you will have little heat, and a cool upper radiator hose when it says overheat.You could also have an internal leak, causing superheated combustion gases to enter the cooling system. If you have heat and the upper hose is hot, the first dollars I would spend is on a block test for combustion gases in the radiator. Internal leaks are common cause of overheat on Northstars.

i got a 2000 cadillac and i put a ratiator waterpump and throma and bleed the lines still run hot

There could be a crack in the block or you have a bad head gasket.
You can get a coolant system pressure test done to see if it is holding pressure up to specification. Pressure is necassary for the cooling sytem to work.
Also, have you confirmed that the cooling fan(s) are working. Make sure they come on when the engine reaches operating temperature. This should be around 200 degrees farenheit. You can get an infra-red temperture gauge for under $20 at most auto parts stores. Point it at the thermostat housing and compare it to the dash gauge and see when the fan comes on. You can also check fan operation by turning on the A/C and the condenser fan should come on rather quickly if not immediately.
If the fan does not come on, there is an electronic PCM control that acts as the realy that could be bad or the temperautre sensor could be bad.

Where is the thermostat in a 1994 Cadillac Seville?

4.6 Northstar is at the engine side of the lower radiator hose. It is installed in the cover that is over the water pump access.

how do i fix this 97 caddy.

Not really enough specifics to form an educated guess on. You could have issues of secondary ignition, fuel pressure, primary items like crank sensors. Is there a check engine light associated with said concerns?

My car constantly runs hot and frequently needs coolant added. I can only travel about 10 miles before it runs hot and I need to stop to let it cool off. Where is the coolant going and what repairs are necessary to avoid this problem?

are the cooling fans operating? does the coolant bubble in the overflow Jug?start here.

Why does my car runs hot, continuously?

There's dozens of possibilities. You need to provide some details or observations. At what speeds? How much too hot? What affects it? Is the air from the heater too hot or too cold? What are the symptoms?