Question about 1992 Lexus Sc 400

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Over heating

Radiator has water,car is over heating

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  • Lexus Master
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Could be a stuck thermostat.

Posted on Apr 21, 2013

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Posted on Jan 02, 2017

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My 1999 dodge caravan is still overheating. I have already replaced the thermostat and the water pump, also there is no heat. please help me someone!


Hi there.
Well you can either have a problem with either radiator outer {dust/dirt in outer core of radiator or clogged up inside were water goes, or soft hoses,blowen head gasket plus a few others ,but first go to garage to were you blow up your tyres and use the air hose and blow out the radiator core where the air goes in, 2 drain out radiator water and then refill with water at 1 ltr at a time and then check your info car book and find how much water the radiator takes ,if it dosent take all the ltrs then the radiator is blocked inside.
if engine runs rough missing etc then get your Head gasket checked out.
When you say no heat is that with heat on gauge or no heat from heater, as it could be heater blockage same as radiator core. So let me know how you get on.

Feb 16, 2015 | 1999 Dodge Caravan

1 Answer

Why is my car leaking water out of the radiator cap only when the heat is off but when the heat is on it don't leak ???


turning the heat on lowers the temperature of the water running through the engine which in turn lowers the pressure in the radiator

Dec 18, 2014 | 2005 Ford Mustang

1 Answer

Check list for answers to my Montero overheating...


Methods to trouble shoot
(1) check thermostat device. if thermostat is stuck - not working half the water used in cooling system is missing once engine heats up which can lead to over heating. (may need mechanic to check this)
(2) check radiator has water in it . if it is low there may be a leak in cooling system somewhere check rubber hose and radiator are not leaking.
(3) check fan belt is engaging fan in front of radiator
(4) if electric fan check if fan activates once car has heated up
(5) check oil level of engine on dip stick. If low oil add some oil and re check oil dip stick. DO NOT PUT whole oil pack in (don't laugh I know someone who did this and has to go to mechanic and get oil removed)
(6) if rubber hoses blow off connectors then you may have a broken head gasket seal. A pressure test of the radiator will confirm this.
(7) Possible water pump failure. Check by taking cap off radiator and run engine see if water is flowing in radiator and test if water is heating up in the radiator. Remember to put cap back on radiator when finishing test.
(8) check if bubbles or oil are in radiator water this could indicate a blown head gasket problem also.


Oct 20, 2014 | Mitsubishi Montero Cars & Trucks

2 Answers

Water comes back out the radiator cap . Has back pressure .


i would suggest a new thermastat and maybe even a new radiator cap but dont forget to check your hoses they maybe collapsed

Jun 22, 2012 | 1993 Ford Explorer Limited

1 Answer

Over heating problems


Hello,

when the car overheats, is there still water in the radiator?

If there is water in the radiator and the car overheats, then it means there might be some dirt or blockage in the radiator or condenser.

When the car is on the motion, air passes through the front and assists the fan to cool the engine. There are situation whereby air doesn't have free flow because of blockage in the radiator and condenser. Dust and debris can cause blockage. If this be the case, have your radiator washed thoroughly and cleaned.

If there is no water in the radiator when the car overheats, then there is a probably a leakage from the water pump. Or maybe your fan isn't blowing properly. The fan might be blowing weak air.

The above are what could cause your engine to over heat.

So start the check from the radiator. Poor water into the radiator, wait for some minutes, look under the car and observe if water is going to leak. If there is a leak, it might be from the water pump or a leaking hose.

If water from radiator has no leak, have your radiator washed and clean the condenser has they might block air that is suppose to cool the engine.

Also, make sure your fan is blowing properly or well enough to cool the engine.

Make sure you have the above checked thoroughly as they are the major causes of problems like this.

This overheating problem could lead to a burnt gasket and this can dry the engine oil which will eventually knock the engine. So have this problem fixed to prevent further damage that will cost you more money.

Lastly, remove the hose that connects the radiator to the engine, water from the engine will come out. Pour water into the radiator, the water will flow through the hose down to the ground. Do this severally. Now connect the hose back to the engine, pour water into the radiator. Start the engine, the water in the radiator will reduce, add more water till radiator is full.

In summary, the major cause of over heating problem is from the radiator, fan, water pump, blockage in the hose, and dirt in in/on the condenser. These are area you need to concentrate on.

I forgot to mention that the acceleration meter or engine meter on the dash board shouldn't be more the 5. It should be below 5. If it is above 5, it can cause overheating. I hope you understand what I mean.....

Regards.

Jan 05, 2012 | Cars & Trucks

1 Answer

New thermostat fitted radiator cap had tested for blown gasket sees ok. Radiator looks very clean inside. Runs fine for plus munis 40 km [hard driving) and suddenly overheats pushing water into...


The radiator sheds heat at a specific rate. Increasing air flow increases that rate a bit, but even with increased air flow, there is a specific rate.

When you start out, there is a "cold reservoir" in the radiator — without shedding any heat at all, for a while the cold water in the radiator will keep the engine cool.

If the heat from the engine exceeds the heat the radiator can shed, as soon as the radiator water hits the temperature of the engine, you will have overheating.

If you have a head gasket leak, you are injecting heat directly into the water, heat that ought to go out the tailpipe.

If some of the tubes in the core of the radiator are not flowing, the ability of the radiator to shed heat will be diminished.

I am thinking it is either a head gasket leak/cracked combustion chamber, or a radiator that does not flow water through all the tubes.

A lean fuel mixture will generate a lot more heat than one that is richer. The coloration of the spark plug insulators can be helpful in assessing the mixture.

Jul 05, 2010 | Cars & Trucks

2 Answers

Engine overheating, 2000 deville


The problem is that more heat is entering the water than is being extracted by the radiator.

But there can be a lot of causes for that. If you have a head gasket leak, it can introduce hot gasses into the water, increasing the heat load while raising the pressure in the cooling system. That in turn can push water out of the cooling system, and into the recovery reservoir, where it can't help with the cooling of the engine.

If the fins of the radiator are blocked or folded over, that part of the radiator will not contribute much to the cooling.

If the internal water passages of the radiator are blocked, the area of the radiator is effectively reduced.

A worn out bottom radiator hose can collapse from the suction of the water pump, blocking the water flow.

If the fuel mixture is too lean (not enough fuel in the given volume of air) the engine will generate quite a bit more heat, possibly overwhelming the system.

When the engine is cold, the thermostat (a valve in the hose where water exits the engine to go to the radiator) is closed. This prevents water from going to the radiator, and that in turn prevents water coming from the radiator to the engine.

Water instead leaves the engine through the heater hose near the upper radiator hose, and circulates right back to the inlet of the water pump. So the water circulated through the engine, but it has no way to shed any heat it picks up. This speeds up the warm-up process.

The water circulating this way passes by the back of the thermostat, causing the thermostat to warm up along with the water.

When the thermostat reaches its opening temperature, it starts to open, allowing some water to go out of the upper hose to the radiator, and therefore some water from the radiator to enter the engine.

Right away, the water in the engine falls below the opening temperature of the thermostat and it closes.

The newly cooled water gets warmed by the engine, raising it to the opening temperature of the thermostat, and the whole process begins again. But this time, the water coming from the radiator is just a little warmer.

Eventually, the thermostat will stay at a partially opened position where the cooling by the radiator just matches the necessary heat loss through the radiator.

If there is not enough water, the surface area of the radiator is effectively less.
If the radiator is blocked, or the fan is not working properly, the surface area of the radiator is effectively less.

If the thermostat doesn't open properly, the radiator is not sufficiently utilized.

If too much heat is generated by the engine, it can over heat (heavy load at low speed will make a lot of heat without spinning the water pump fast enough, for instance).

These are a few preliminary tests to see what's going on. With a stone cold engine, start it and let it idle. The heater hose leaving the thermostat area should begin to heat up but not the upper radiator hose.

Once the heater hose starts to become uncomfortably hot, the upper radiator hose should start to warm up, slowly at first.

If the heater hose does not heat up, there might be insufficient flow throw that part of the system.

There is a quick check a shop can perform to see if you have exhaust in the water. There is a syringe they can use to draw the vapor in the radiator through a sensing liquid. If it changes color, you have a head gasket leak.

The radiator cap only need to be replaced if it is letting the coolant move into the reservoir improperly. If you coolant level remains fine, that is probably not a problem.

Jun 20, 2010 | 2001 Cadillac DeVille

1 Answer

Over heating of car radiator


First of all see the fan is working,this probably the main cause,secondly it can be the water pump not working.I give a tips,to know if the the pump is working properly,when the engine is cold,you take out the hose from the radiator,the upper one,when doing that your radiator must be full of water,now let someone start the engine and you stay in front of the bonnet ,when already start the engine ,see from the the hose that you have taken out if water is coming out well,accelerate a little more see if the water come out rapidly and constantly,be careful not to let the radiator empty keep it with water keep filling it by using a water hose,if the water pump is not pumping enough that the cause of over heating.

Jan 08, 2010 | 1990 Nissan Sentra

2 Answers

Car is overheating, thermostat was changed and the radiator was flushed, car does not overheat while idoling, but when you start driving it overheats


It sounds like water pump may be your problem. It circulates a 50/50 mixture of glycol (or some form of) and water through the engine block and cylinder head and back through the radiator. In the radiator the mixture is cooled when air passes over the fins of the radiator. This is accomplished by driving or a mechanical/electrical fan when stationary. The water pump also circulates the mixture through the heater core giving the car heat. If the water pump is not circulating the water back to the radiator to cool, it will overheat. More heat is caused by the engine when driving (much less heat when idling), hence the overheating while driving.
I hope this helps and good luck!
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Nov 04, 2009 | 2003 Nissan Maxima

1 Answer

Over heating and loss of coolant


Need to check your radiator flow, and thermostat, start the engine cold, with radiator cap off, watch for the water in the radiator, when it starts to bubble over let it, keep water hose close, radiator should blow back till the thermostat opens, the water will go down, and add more water if needed, and put the cap back on,,,, if your thermostat is stick closed it will cause over heating......and you may have to have it replaced.

Feb 01, 2009 | 1999 Volkswagen Golf

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