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Overheating, but can't find leak and pressure tested for head leak and passed . can't find reason for overheating

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The thermostat can stick once in awhile doing this

Posted on Jun 06, 2010

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Posted on Jan 02, 2017

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Why did my 2011 DTS Cadillac overheat?


An overheated engine can be caused by anything that decreases the cooling system's ability to absorb, transport and dissipate heat; therefore engines can overheat for a variety of reasons. Let's take a look at some of the most common causes.
Cooling System Leaks
This is the primary cause of engine overheating. Possible leak points include hoses, the radiator, water pump, thermostat housing, heater core, head gasket, freeze plugs, automatic transmission oil cooler, cylinder heads and block. Perform a pressure test. A leak-free system should hold pressure for at least one minute.
Wrong Coolant Concentration
Be sure to use the coolant recommended by your vehicle's manufacturer. The wrong type of coolant and/or mixing the incorrect concentration of coolant and distilled water can also result in engine overheating. The best bet is to perform a complete flush and fill.
Bad Thermostat
A thermostat is a heat-sensitive valve that opens and closes in response to engine temperature. Heated engine coolant passes through to the radiator when the thermostat is in the open position. In the closed position, it prevents the flow of coolant to speed up the warming of a cold engine. When the thermostat gets stuck in the closed position, coolant stays in the engine and quickly becomes overheated, resulting in engine overheating.
Blocked Coolant Passageways
Rust, dirt and sediment can all block or greatly impede the flow of coolant through the cooling system. This can limit the system's ability to control engine temperature, which may result in higher operating temperatures and engine overheating. Once again, a flush and fill is recommended to remove debris.
Faulty Radiator
By passing through a series of tubes and fins, coolant temperature is reduced in the radiator. Leaks and clogging are some of the most common causes of radiator failure. Any disruption in the radiator's function can lead to elevated engine temperature and overheating.
Worn/Burst Hoses
A hose that contains visual cracks or holes, or has burst will result in leaks and disrupt the flow of engine coolant. This can result in overheating.
Bad Radiator Fan
A fan blows air across the radiator fins to assist in reducing the temperature of the coolant. A fan that wobbles, spins freely when the engine is off, or has broken shrouds will not be able to reduce the temperature to proper level, thus possibly resulting in engine overheating.
Loose or Broken Belt
A belt is often the driving link that turns the water pump at the correct speed for proper coolant flow through the cooling system. If a belt is loose or broken, it cannot maintain the proper speed, thus resulting in poor coolant flow and ultimately, engine overheating.
Faulty Water Pump
Known as the 'heart' of the cooling system, the water pump is responsible for pressurizing and propelling engine coolant through the cooling system. Any malfunction of the water pump, including eroded impeller vanes, seepage or wobble in the pump shaft, can prevent adequate coolant flow and result in engine overheating.

Oct 13, 2016 | 2011 Cadillac DTS

1 Answer

02 pt cruiser is overheating how do I find the cause of it


check the following: 1.radiator fan motor and fuse for operation. 2. run cooling system pressure test for head gasket, hoses, water pump leaks. 3. pressure test radiator cap. If all tests pass, flush radiator with coolant flush or citric acid for 33-45 minutes

Sep 10, 2015 | Cars & Trucks

1 Answer

How do I check for a blown head gasket on my 1990


Pretty much same answer as I gave for 87 Reliant see below. Shops have equipment to do cylinder leakage test. Do basic stuff below before doing last test ...cylinder leakage...which costs $$$.

Main point you are losing antifreeze/water. Check to see if you have water on the dipstick mixed in with oil. If so...probably a head gasket. If oil looks normal..... Before you do any test, tighten every hose connection. Check for loose connection into antifreeze reservoir. Sometimes there are small cracks on top which lets out pressure from cooling system. Look for leaks on water pump and radiator. Look at spot where you park the car...any liquid on floor? Not sure?..Put piece of cardboard under car to see if liquid is dripping from car. No leaks?...Start with a pressure test of the system. The pressure test is simply equipment that replace the radiator cap, a hand pump connected to it then air is pumped into cooling system. You watch the gauge to see if pressure is dropping. If pressure does not drop ..problem is most like a worn radiator pressure cap or stuck thermostat.. Do not buy the kind with button on cap to push down and release pressure. get original type and correct pressure. If overheating still, thermostat could be stuck, replace. Overheating of engine causes vapor lock, bubbles in fuel, which causes car to stall and kill. When cools off, fuel cools down and fuel will flow through fuel system again. Large amount of oil disappearing with overheating also sounds like head gasket or cracked head....Tighten up all bolts to gaskets, look for oil leaks on garage floor or driveway. If engine has developed a miss when running, pull plugs out and look for wet fouled plug. If antifreeze leaking into cylinder...plug tip will be whitish, if oil leaking into cylinder, grimey oil fouled. Do compression test on cylinder that is fouled and that will pinpoint if bad head gasket or cracked head. When doing compression test, radiator cap is removed and you listen to hear bubbles in radiator from the cylinder leaking into cooling system. 87 Reliant not worth pulling engine apart if head gasket or cracked head. Best oil treatment to reduce oil consumption is "Engine Restore" Used on my 58 Impala 348 tri power for 28 years. If I did not add it after oil changes it used oil and smoked....I swear by it for ANY engine after 100,000 miles.

Oct 19, 2014 | Cars & Trucks

1 Answer

Overheating


Overheating can be "boiled" down to a few issues:
*blockage: Something is stopping or slowing the flow. Main suspect is the thermostat. It is designed to open and close at the proper temperature so as to keep the engine at the optimum temperature range. They have a tendency to lock closed and cause overheating. Sometimes it's random. The blockage may be something like sludge or rust in the radiator or gunk that someone put in that does not agree with it.

*coolant/water loss. A leak somewhere. Blown head gasket, cracked head/block, hose, etc.
*pressure loss. This happens when the water gets to boiling temperature but is kept under control by pressure (pressure resists heat) and then something such as the radiator cap releases the pressure and the temperature rises. The coolant will also leak out and then the overheating will be due coolant loss as well. This is especially true with the Cadillac Northstar. The head bolts allow the head to lift off the block, ever so slightly, and pressurize the coolant system with exhaust gases beyond radiator cap pressure limits. It's usually when you accelerate or put the engine under load such as going up hill.

^check for exhaust gases in the coolant. smell it or buy a kit to test.
^get a new thermostat, or, test the old one by boiling it in water on the stove; see if it opens. I always get the "failsafe" kind: fails in the open position.
^check for oil in the coolant or coolant in the oil: grey sludge.
^check for leaks on the ground.
^test the radiator cap. some part stores have a way to test them.
^check to see if it's made by Cadillac. look for the word Northstar. If so, hold on to your wallet. There's a whole new world of overheating adventures.

Oct 27, 2013 | 2001 Oldsmobile Alero

1 Answer

OVERHEATING STOPS RUNING


Check Engine coolant level, if ok, then try replacing engine thermostat. If overheating continues, pressure check the coolant system. If it fails the pressure test, I would bet on a leaking head gasket which would be evacuating your coolant by passing it out the tail pipe. Check the spark plugs to see if they look like they are all burining uniformly. Check plugs before replacing head gasket to confirm the suspicion. Sad to say, but if water was used as antifreeze, and allowed to freeze in the block, you may have a cracked head or block. Take it one step at a time. Good Luck!

Jan 24, 2013 | Cars & Trucks

1 Answer

2001 Pontiac grand am overheating problem. I have done new head gaskets new intake gaskets, new water pump, new thermostat, new radiator, new reservoir w/ cap. system has no leaks pressurized for 2.5...


Have a cylinder leakage test or co2 test done. my prefered method is a leakage test as it checks heads, head gaskets, valves, rings all in one test.

Oct 09, 2012 | Pontiac Grand Am Cars & Trucks

1 Answer

Leaking anitfreeze but it is not overheating


A coolant leak without overheating is a sign of things to come.
E.g. overheating, stranded on the side of the road, head gasket ect.

Pressure test the system, locate & rectify the coolant leak before any of the above occure.

Sep 28, 2012 | 2005 GMC Yukon

1 Answer

1993 jeep grand cheroke leaks coolant when i shut it off


The reason for that may be that when its running it holds enough pressure to withold the leak momentarily. The main places where it could be leaking from is upper or lower radiator hoses, water pump, radiator, resevior tank or through you'r head gaskets. If you have the time, take it to a mechanic and have him pressure test it to see where the leak is coming from exatcly. Runing the engine with a leak, increases the chance of it overheating, which could cause internal engine damage.

Hope this Helps!

Jun 02, 2011 | 1993 Jeep Grand Cherokee

2 Answers

Unexplained coolant loss. Cyl. pressures good don't thing it is head gasket. No visible leaks. Goes thru resovoir daily.


If there isn't a puddle of coolant forming on the driveway after the car sits for awhile and there isn't a puddle inside the passenger compartment, then the problem must lie in the cylinder head or engine block.

Jan 02, 2011 | Daewoo Nubira Cars & Trucks

3 Answers

2002 malibu runs hot.


Sounds like you have a faulty head gasket or maybe a cracked head.This can cause overheating and the check engine light to come on.The code for the o2 sensor is probably caused by coolant getting into the exhaust system and coating the sensor.The coolant fan may work but it cannot remove enough heat from the rad to make the engine cool off.Try some engine coolant stop leak to see if it will help.This maybe only a temperary fix.Let me know if you need more.MOE

Jun 22, 2010 | 2002 Chevrolet Malibu

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