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My pontaic bonneville gxp is running hot. I change the thermostat, got it flush out. A mechanic problem may be the head gaskets or i may have to change the north star engine

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  • Cars & Trucks Master
  • 46,561 Answers

Several points to consider
when is it running hot ---if at lights on in slow traffic then it may be the viscous fan hub has failed
have a compression test done to eliminate gasket problems
was the thermostat installed with the body facing the water in the head/block
are the fins on the radiator in good condition or are they flaking off
If the engine is running good generally forget the advice to change engine
after replacing the thermostat it is important to ensure that all air is removed from cooling system as that will make the engine run hot as well

Posted on Apr 15, 2015

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Posted on Jan 02, 2017

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SOURCE: over heating mitsubishi k4n engine

use 50-50 antifreeze and change your radiator cap but first drain all the old antifreeze out.. hope this help

Posted on Dec 18, 2008

  • 23 Answers

SOURCE: overheating

You could have several issues here. A blockage in the radiator, bad coolant temp sensor, (not turning the cooling fan on) a bad cooling fan motor. sounds as if maybe one of these may be your primary issue, and the cause of the overheating that originally caused your head gasket problem. Hope this helps

Posted on Aug 22, 2009

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SOURCE: overheating they say head gasket changed

If you have white smoke from the tailpipe, coolant in the engine oil, engine oil in the cooling system, that indicates a head gasket failure. However, the most definitive way to test is to have a hydrocarbon test done on the cooling system (checks for exhaust gasses that obviously don't belong in there).
If the system comes up clean, you still can have either a leaking intake gasket, partially obstructed radiator (many times flush will go around obstructions not through them), a malfunctioning electric fan or fan relay, or even an obstruction in front of the a/c condenser or between the condenser and radiator (leaves, plastic bags etc) Don't forget though even if the cause is other than a gasket, if repeatedly or severely overheated the head gaskets can also fail. That is why complete testing is very important.
good luck

Posted on Jan 20, 2010

dennymulford
  • 1055 Answers

SOURCE: System flushed, coolant changed , this is when

dex coolent is fine if it still runs hot you have problems elsewhere!!!

Posted on Feb 28, 2010

roniecon
  • 6927 Answers

SOURCE: 2001 grand cherokee running hot , replaced water

If it is the 4.0 engine there have always been bad to have a cracked head,right between the valves in one of the cylinders.

Posted on Aug 01, 2010

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Look in the radiator to determine if the brown stuff is rust or oil. If it's oil then the head gaskets are blown and the heads will have to go to a machine shop to be ground flat. Do them both even if one side is ok, or the engine will never idle right. If it's just rust, install a back flush kit and blow out the rust. Turn the heater on when you back flush to get the rust out of the heater core. Replace the thermostat and anti freeze. Pressurize the radiator and make sure it holds. If the pressure drops off then look to find where the leak is (head gaskets)

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Your dipstick is supposed to be hot. The oil runs over the hot mechanisms and back into the pan and cooler oil cycles through again. The warmer your engine the better it will run. ( don't want it to overheat though) my car runs about halfway between the middle and three fourths mark on the thermostat. And it runs great. Hope this helps!:)

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I have a 93 stealth keeps running hot my mac. Said it was waterpump so had him change it I changed redaitor . And thrumosat. All hoses I do have fans wire full blast. Is that bad just didn't want it to...


Good idea on the fans. Keep it that way till you fix the problem. Won't hurt anything, just may shorten fan life-but a new fan is much less expensive than a new engine.
Watch the temp gauge on your dash. The thermostat should open as it warms up, before the gauge gets up to half-way. You can tell when the thermostat starts to open-the upper radiator hose will start feeling hot, or at least start warming up. You will get a rough idea if the thermostat is working properly. By the time engine is at normal operating temperature, the thermostat should be fully open and the hose will feel quite warm. If the hose is still cool when engine is at operating temp., the thermostat may be opening too late, as in wrong thermostat. Not very likely, but always possible.
How did the shop check the head gaskets? Did they do a compression test? With new pump, new radiator, new hoses...should be good, but still runs hot? Any bubbling in your overflow tank? You may want to consider having a block test done, where they check for exhaust gases in the coolant. That would be a head gasket leak causing hot running condition. Maybe the shop checked the gaskets this way, or maybe they missed something? About the only other thing I could think of would be a coolant circulation problem inside the engine, a restriction or something, that an engine flush might clear up. A shop could do a reverse flush of the engine if there is a circulation problem.
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My Grand Prix stared running hot. We replaced head gaskets and intake gaskets, replaced water pump, thermostat, and flushed radiator. My car is still running hot. The heat not blowing hot even after new...


are you sure that the radiator is not clog ,also check the cap for broken gasket also check the hoses for stiffness i would also wanna run it without thermostat to see what happens ,some times they come defected from manufacturer good luck

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A blown head gasket is usually easy to confirm. The head gasket prevents the engine coolant and oil from mixing under the head. If you have a blown head gasket, you should be able to see bubbles of water/cooland on the dip stick when you check your oil.

I do agree that with your heater taking a while to get warm, it probably has some build-up in the system that needs to be flushed out, before it causes other issues.

Best of luck!

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